WG 2.11 - User contributions [en]

W211/M25Shan

2025-12-11T13:40:31Z

Jacques: Created page with "Yafei Yang and Chung-chieh Shan Developing quantum programs requires not only running them on quantum hardware but also simulating them on classical hardware. Because the semantics of a quantum program can be defined in terms of complex state vectors, it can in principle be simulated using any implementation of probabilistic or weighted programming that supports complex or at least negative weights. In this study, we compile a high-level quantum programming language to..."

Yafei Yang and Chung-chieh Shan

Developing quantum programs requires not only running them on quantum hardware but also simulating them on classical hardware. Because the semantics of a quantum program can be defined in terms of complex state vectors, it can in principle be simulated using any implementation of probabilistic or weighted programming that supports complex or at least negative weights. In this study, we compile a high-level quantum programming language to one such implementation---the _factor graph grammar_ solver for probabilistic programming---and benchmark its simulation performance. We prove that our compiler preserves the denotational semantics of the source language. To bring this simulation performance into the ballpark of the popular Qiskit toolkit, we enhance the solver with an optimization that commutes the tensor operations einsum and expand.

File:WG211 M25 Shan.pdf

2025-12-10T14:29:43Z

Jacques:

WG211/M25Schedule

2025-12-10T14:29:04Z

Jacques: /* Talks */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

[[File:WG211_M25_Group_Photo.jpg|600px|thumb|right|Group Picture]]

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

We need to follow the venue's standard schedule (start at 9:00, out by 17:30 sharp), 90min sessions, 30mins tea breaks, lunch 12:30 - 14:00.

STIAS' doors open at 8:00, and there's some coffee but no breakfast; that should be covered by your B&B. I think it is good enough to arrive by 8:45, give or take a few minutes.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Michael Adams
* Shraddha Barke
* Jacques Carette (+1)
* Sebastian Erdweg (have to leave before dinner)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Moeketsi Raselimo
* Chung-Chieh Shan
* Friedrich Steimann (have to leave with Sebastian)
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop
* Julia Lawall

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke [[WG211/M25Barke| Toward Trustworthy LLM Generation: From Verifiable Proofs to Reliable Agents]]
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg: Differential Execution with Lexical Tracing
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Chung-chieh Shan [[W211/M25Shan| Simulating Quantum Computation Using Probabilistic Programming]] ([[Media:WG211_M25_Shan.pdf|slides]])
* Friedrich Steimann [[WG211/M25Steimann| Relative Multiplication of Infinite Relations]]
* Michel Steuwer [[WG211/M25Steuwer| Slotted E-Graphs]]
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk: [[WG211/M25VanWyk| On Scope Graphs and Reference Attribute Grammars: Answering Eelco's Questions]]

== Schedule ==

Tuesday, December 2

* 08:45 - 09:00 Assemble and welcome
** 09:00 - 09:45 Van Wyk
** 09:45 - 10:30 Barke
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Erdweg
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Adams
** 14:45 - 15:30 Fischer / Raselimo
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 Discussion

* 19:00 Dinner: [https://www.devier.co.za De Vier]

Wednesday, December 3

** 09:00 - 09:45 Carette
** 09:45 - 10:30 Steuwer
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Steimann
** 11:45 - 12:30 Kammar
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Kaliszyk
** 14:45 - 15:30 Lawall
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 TBD

* 18:30 Dinner: [https://bertusbasson.com/#spek-bone Spek en Bone]

Thursday, December 4

** 09:00 - 09:45 Yallop
** 09:45 - 10:30 Murase
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Shan
** 11:45 - 12:30 TBD
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 TBD
** 14:45 - 15:30 TBD
* 15:30 - 16:00 Coffee break
** 16:00 - 17:30 Business Meeting

* 19:00 Dinner: [https://devleispaleis.co.za De Vleispaleis]

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

==== Arrivals and departures of attendants ====

* Friedrich will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Sebastian will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Julia will arrive on Monday morning at 5:50am (Air France from Paris) and leave on the following Monday morning at 7:55am; staying at The Avenues Guest House.
* Jacques will arrive a whole week before, Sunday Nov. 23, stay in Cape Town, then get to Stellenbosch on Monday 1 December, and leave on Saturday Dec 6 at 5 PM (Turkish Airlines TK 45). Staying at Laanhof.
* Shraddha will arrive on 1st Dec 11.40am and leave on Sunday 7th Dec 9.30pm; staying at the 5 Seasons Guest House.
* Ohad will arrive Monday 1 Dec 11.15pm and leave Friday 5 Dec 11.45pm (KL598). His luggage will hopefully arrive the following day :(. Staying at the 5 Seasons Guest House.

File:WG211 M25 Group Photo.jpg

2025-12-10T14:26:28Z

Jacques: Pictures of all the people who attended this meeting

== Summary ==
Pictures of all the people who attended this meeting

WG211/M25Schedule

2025-12-10T14:25:47Z

Jacques: /* IFIP Working Group 2.11, Twenty-fifth Meeting */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

[[File:WG211_M25_Group_Photo.jpg|600px|thumb|right|Group Picture]]

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

We need to follow the venue's standard schedule (start at 9:00, out by 17:30 sharp), 90min sessions, 30mins tea breaks, lunch 12:30 - 14:00.

STIAS' doors open at 8:00, and there's some coffee but no breakfast; that should be covered by your B&B. I think it is good enough to arrive by 8:45, give or take a few minutes.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Michael Adams
* Shraddha Barke
* Jacques Carette (+1)
* Sebastian Erdweg (have to leave before dinner)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Moeketsi Raselimo
* Chung-Chieh Shan
* Friedrich Steimann (have to leave with Sebastian)
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop
* Julia Lawall

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke [[WG211/M25Barke| Toward Trustworthy LLM Generation: From Verifiable Proofs to Reliable Agents]]
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg: Differential Execution with Lexical Tracing
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Chung-chieh Shan
* Friedrich Steimann [[WG211/M25Steimann| Relative Multiplication of Infinite Relations]]
* Michel Steuwer [[WG211/M25Steuwer| Slotted E-Graphs]]
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk: [[WG211/M25VanWyk| On Scope Graphs and Reference Attribute Grammars: Answering Eelco's Questions]]

== Schedule ==

Tuesday, December 2

* 08:45 - 09:00 Assemble and welcome
** 09:00 - 09:45 Van Wyk
** 09:45 - 10:30 Barke
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Erdweg
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Adams
** 14:45 - 15:30 Fischer / Raselimo
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 Discussion

* 19:00 Dinner: [https://www.devier.co.za De Vier]

Wednesday, December 3

** 09:00 - 09:45 Carette
** 09:45 - 10:30 Steuwer
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Steimann
** 11:45 - 12:30 Kammar
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Kaliszyk
** 14:45 - 15:30 Lawall
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 TBD

* 18:30 Dinner: [https://bertusbasson.com/#spek-bone Spek en Bone]

Thursday, December 4

** 09:00 - 09:45 Yallop
** 09:45 - 10:30 Murase
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Shan
** 11:45 - 12:30 TBD
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 TBD
** 14:45 - 15:30 TBD
* 15:30 - 16:00 Coffee break
** 16:00 - 17:30 Business Meeting

* 19:00 Dinner: [https://devleispaleis.co.za De Vleispaleis]

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

==== Arrivals and departures of attendants ====

* Friedrich will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Sebastian will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Julia will arrive on Monday morning at 5:50am (Air France from Paris) and leave on the following Monday morning at 7:55am; staying at The Avenues Guest House.
* Jacques will arrive a whole week before, Sunday Nov. 23, stay in Cape Town, then get to Stellenbosch on Monday 1 December, and leave on Saturday Dec 6 at 5 PM (Turkish Airlines TK 45). Staying at Laanhof.
* Shraddha will arrive on 1st Dec 11.40am and leave on Sunday 7th Dec 9.30pm; staying at the 5 Seasons Guest House.
* Ohad will arrive Monday 1 Dec 11.15pm and leave Friday 5 Dec 11.45pm (KL598). His luggage will hopefully arrive the following day :(. Staying at the 5 Seasons Guest House.

WG211/M25Schedule

2025-12-03T05:37:46Z

Jacques: /* Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

We need to follow the venue's standard schedule (start at 9:00, out by 17:30 sharp), 90min sessions, 30mins tea breaks, lunch 12:30 - 14:00.

STIAS' doors open at 8:00, and there's some coffee but no breakfast; that should be covered by your B&B. I think it is good enough to arrive by 8:45, give or take a few minutes.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Sebastian Erdweg (have to leave before dinner)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Chung-Chieh Shan
* Friedrich Steimann (have to leave with Sebastian)
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop
* Julia Lawall

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke [[WG211/M25Barke| Toward Trustworthy LLM Generation: From Verifiable Proofs to Reliable Agents]]
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg: Differential Execution with Lexical Tracing
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Chung-chieh Shan
* Friedrich Steimann [[WG211/M25Steimann| Relative Multiplication of Infinite Relations]]
* Michel Steuwer [[WG211/M25Steuwer| Slotted E-Graphs]]
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk: [[WG211/M25VanWyk| On Scope Graphs and Reference Attribute Grammars: Answering Eelco's Questions]]

== Schedule ==

Tuesday, December 2

* 08:45 - 09:00 Assemble and welcome
** 09:00 - 09:45 Van Wyk
** 09:45 - 10:30 Barke
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Erdweg
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Adams
** 14:45 - 15:30 Fischer / Raselimo
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 Discussion

* 19:00 Dinner: [https://www.devier.co.za De Vier]

Wednesday, December 3

** 09:00 - 09:45 Carette
** 09:45 - 10:30 Steuwer
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Steimann
** 11:45 - 12:30 Kammar
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Kaliszyk
** 14:45 - 15:30 Lawall
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 TBD

* 19:00 Dinner: [https://bertusbasson.com/#spek-bone Spek en Bone]

Thursday, December 4

** 09:00 - 09:45 Yallop
** 09:45 - 10:30 Murase
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Shan
** 11:45 - 12:30 TBD
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 TBD
** 14:45 - 15:30 TBD
* 15:30 - 16:00 Coffee break
** 16:00 - 17:30 Business Meeting

* 19:00 Dinner: [https://devleispaleis.co.za De Vleispaleis]

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

==== Arrivals and departures of attendants ====

* Friedrich will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Sebastian will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Julia will arrive on Monday morning at 5:50am (Air France from Paris) and leave on the following Monday morning at 7:55am; staying at The Avenues Guest House.
* Jacques will arrive a whole week before, Sunday Nov. 23, stay in Cape Town, then get to Stellenbosch on Monday 1 December, and leave on Saturday Dec 6 at 5 PM (Turkish Airlines TK 45). Staying at Laanhof.
* Shraddha will arrive on 1st Dec 11.40am and leave on Sunday 7th Dec 9.30pm; staying at the 5 Seasons Guest House.
* Ohad will arrive Monday 1 Dec 11.15pm and leave Friday 5 Dec 11.45pm (KL598). His luggage will hopefully arrive the following day :(. Staying at the 5 Seasons Guest House.

WG211/M25Schedule

2025-12-03T05:36:31Z

Jacques: /* Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

We need to follow the venue's standard schedule (start at 9:00, out by 17:30 sharp), 90min sessions, 30mins tea breaks, lunch 12:30 - 14:00.

STIAS' doors open at 8:00, and there's some coffee but no breakfast; that should be covered by your B&B. I think it is good enough to arrive by 8:45, give or take a few minutes.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Sebastian Erdweg (have to leave before dinner)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Chung-Chieh Shan
* Friedrich Steimann (have to leave with Sebastian)
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop
* Julia Lawall

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke [[WG211/M25Barke| Toward Trustworthy LLM Generation: From Verifiable Proofs to Reliable Agents]]
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg: Differential Execution with Lexical Tracing
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Chung-chieh Shan
* Friedrich Steimann [[WG211/M25Steimann| Relative Multiplication of Infinite Relations]]
* Michel Steuwer [[WG211/M25Steuwer| Slotted E-Graphs]]
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk: [[WG211/M25VanWyk| On Scope Graphs and Reference Attribute Grammars: Answering Eelco's Questions]]

== Schedule ==

Tuesday, December 2

* 08:45 - 09:00 Assemble and welcome
** 09:00 - 09:45 Van Wyk
** 09:45 - 10:30 Barke
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Erdweg
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Adams
** 14:45 - 15:30 Fischer / Raselimo
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 Discussion

* 19:00 Dinner: [https://www.devier.co.za De Vier]

Wednesday, December 3

** 09:00 - 09:45 Carette
** 09:45 - 10:30 Steuwer
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Steimann
** 11:45 - 12:30 Kammar
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Kaliszyk
** 14:45 - 15:30 Lawall
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 TBD

* 19:00 Dinner: [https://bertusbasson.com/#spek-bone Spek en Bone]

Thursday, December 4

** 09:00 - 09:45 Yallop
** 09:45 - 10:30 Murase
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Shan
** 11:45 - 12:30 TBD
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 TBD
** 14:45 - 15:30 TBD
* 15:30 - 16:00 Coffee break
** 16:00 - 17:30 Business Meeting

* 19:00 Dinner: [https://bertusbasson.com/#spek-bone Spek en Bone]

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

==== Arrivals and departures of attendants ====

* Friedrich will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Sebastian will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Julia will arrive on Monday morning at 5:50am (Air France from Paris) and leave on the following Monday morning at 7:55am; staying at The Avenues Guest House.
* Jacques will arrive a whole week before, Sunday Nov. 23, stay in Cape Town, then get to Stellenbosch on Monday 1 December, and leave on Saturday Dec 6 at 5 PM (Turkish Airlines TK 45). Staying at Laanhof.
* Shraddha will arrive on 1st Dec 11.40am and leave on Sunday 7th Dec 9.30pm; staying at the 5 Seasons Guest House.
* Ohad will arrive Monday 1 Dec 11.15pm and leave Friday 5 Dec 11.45pm (KL598). His luggage will hopefully arrive the following day :(. Staying at the 5 Seasons Guest House.

WG211/M25Schedule

2025-12-02T15:55:49Z

Jacques: /* Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

We need to follow the venue's standard schedule (start at 9:00, out by 17:30 sharp), 90min sessions, 30mins tea breaks, lunch 12:30 - 14:00.

STIAS' doors open at 8:00, and there's some coffee but no breakfast; that should be covered by your B&B. I think it is good enough to arrive by 8:45, give or take a few minutes.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Sebastian Erdweg (have to leave before dinner)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Chung-Chieh Shan
* Friedrich Steimann (have to leave with Sebastian)
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop
* Julia Lawall

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke [[WG211/M25Barke| Toward Trustworthy LLM Generation: From Verifiable Proofs to Reliable Agents]]
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg: Differential Execution with Lexical Tracing
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Chung-chieh Shan
* Friedrich Steimann [[WG211/M25Steimann| Relative Multiplication of Infinite Relations]]
* Michel Steuwer [[WG211/M25Steuwer| Slotted E-Graphs]]
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk: [[WG211/M25VanWyk| On Scope Graphs and Reference Attribute Grammars: Answering Eelco's Questions]]

== Schedule ==

Tuesday, December 2

* 08:45 - 09:00 Assemble and welcome
** 09:00 - 09:45 Van Wyk
** 09:45 - 10:30 Barke
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Erdweg
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Adams
** 14:45 - 15:30 Fischer / Raselimo
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 Discussion

* 19:00 Dinner: [https://www.devier.co.za De Vier]

Wednesday, December 3

** 09:00 - 09:45 Carette
** 09:45 - 10:30 Steuwer
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Steimann
** 11:45 - 12:30 Kammar
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Kaliszyk
** 14:45 - 15:30 Lawall
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 TBD

* 19:00 Dinner: [https://bertusbasson.com/#spek-bone Spek en Bone]

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

==== Arrivals and departures of attendants ====

* Friedrich will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Sebastian will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Julia will arrive on Monday morning at 5:50am (Air France from Paris) and leave on the following Monday morning at 7:55am; staying at The Avenues Guest House.
* Jacques will arrive a whole week before, Sunday Nov. 23, stay in Cape Town, then get to Stellenbosch on Monday 1 December, and leave on Saturday Dec 6 at 5 PM (Turkish Airlines TK 45). Staying at Laanhof.
* Shraddha will arrive on 1st Dec 11.40am and leave on Sunday 7th Dec 9.30pm; staying at the 5 Seasons Guest House.
* Ohad will arrive Monday 1 Dec 11.15pm and leave Friday 5 Dec 11.45pm (KL598). His luggage will hopefully arrive the following day :(. Staying at the 5 Seasons Guest House.

WG211/M25Schedule

2025-12-02T15:55:15Z

Jacques: /* Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

We need to follow the venue's standard schedule (start at 9:00, out by 17:30 sharp), 90min sessions, 30mins tea breaks, lunch 12:30 - 14:00.

STIAS' doors open at 8:00, and there's some coffee but no breakfast; that should be covered by your B&B. I think it is good enough to arrive by 8:45, give or take a few minutes.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Sebastian Erdweg (have to leave before dinner)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Chung-Chieh Shan
* Friedrich Steimann (have to leave with Sebastian)
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop
* Julia Lawall

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke [[WG211/M25Barke| Toward Trustworthy LLM Generation: From Verifiable Proofs to Reliable Agents]]
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg: Differential Execution with Lexical Tracing
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Chung-chieh Shan
* Friedrich Steimann [[WG211/M25Steimann| Relative Multiplication of Infinite Relations]]
* Michel Steuwer [[WG211/M25Steuwer| Slotted E-Graphs]]
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk: [[WG211/M25VanWyk| On Scope Graphs and Reference Attribute Grammars: Answering Eelco's Questions]]

== Schedule ==

Tuesday, December 2

* 08:45 - 09:00 Assemble and welcome
** 09:00 - 09:45 Van Wyk
** 09:45 - 10:30 Barke
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Erdweg
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Adams
** 14:45 - 15:30 Fischer / Raselimo
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 Discussion

* 19:00 Dinner: [https://www.devier.co.za De Vier]

Wednesday, December 3

** 09:00 - 09:45 Carette
** 09:45 - 10:30 Steuwer
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Steimann
** 11:45 - 12:30 Kammar
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Kaliszyk
** 14:45 - 15:30 Lawall
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 TBD

* 19:00 Dinner: [https://www.devier.co.za De Vier]

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

==== Arrivals and departures of attendants ====

* Friedrich will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Sebastian will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Julia will arrive on Monday morning at 5:50am (Air France from Paris) and leave on the following Monday morning at 7:55am; staying at The Avenues Guest House.
* Jacques will arrive a whole week before, Sunday Nov. 23, stay in Cape Town, then get to Stellenbosch on Monday 1 December, and leave on Saturday Dec 6 at 5 PM (Turkish Airlines TK 45). Staying at Laanhof.
* Shraddha will arrive on 1st Dec 11.40am and leave on Sunday 7th Dec 9.30pm; staying at the 5 Seasons Guest House.
* Ohad will arrive Monday 1 Dec 11.15pm and leave Friday 5 Dec 11.45pm (KL598). His luggage will hopefully arrive the following day :(. Staying at the 5 Seasons Guest House.

WG211/M25Schedule

2025-12-02T12:04:01Z

Jacques: /* Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

We need to follow the venue's standard schedule (start at 9:00, out by 17:30 sharp), 90min sessions, 30mins tea breaks, lunch 12:30 - 14:00.

STIAS' doors open at 8:00, and there's some coffee but no breakfast; that should be covered by your B&B. I think it is good enough to arrive by 8:45, give or take a few minutes.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Sebastian Erdweg (have to leave before dinner)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Chung-Chieh Shan
* Friedrich Steimann (have to leave with Sebastian)
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop
* Julia Lawall

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke [[WG211/M25Barke| Toward Trustworthy LLM Generation: From Verifiable Proofs to Reliable Agents]]
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg: Differential Execution with Lexical Tracing
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Chung-chieh Shan
* Friedrich Steimann [[WG211/M25Steimann| Relative Multiplication of Infinite Relations]]
* Michel Steuwer [[WG211/M25Steuwer| Slotted E-Graphs]]
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk: [[WG211/M25VanWyk| On Scope Graphs and Reference Attribute Grammars: Answering Eelco's Questions]]

== Schedule ==

Tuesday, December 2

* 08:45 - 09:00 Assemble and welcome
** 09:00 - 09:45 Van Wyk
** 09:45 - 10:30 Barke
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Erdweg
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Adams
** 14:45 - 15:30 Fischer / Raselimo
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 Discussion

* 19:00 Dinner: [https://www.devier.co.za De Vier]

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

==== Arrivals and departures of attendants ====

* Friedrich will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Sebastian will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Julia will arrive on Monday morning at 5:50am (Air France from Paris) and leave on the following Monday morning at 7:55am; staying at The Avenues Guest House.
* Jacques will arrive a whole week before, Sunday Nov. 23, stay in Cape Town, then get to Stellenbosch on Monday 1 December, and leave on Saturday Dec 6 at 5 PM (Turkish Airlines TK 45). Staying at Laanhof.
* Shraddha will arrive on 1st Dec 11.40am and leave on Sunday 7th Dec 9.30pm; staying at the 5 Seasons Guest House.
* Ohad will arrive Monday 1 Dec 11.15pm and leave Friday 5 Dec 11.45pm (KL598). His luggage will hopefully arrive the following day :(. Staying at the 5 Seasons Guest House.

WG211/M25Schedule

2025-12-01T17:00:45Z

Jacques: /* Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

We need to follow the venue's standard schedule (start at 9:00, out by 17:30 sharp), 90min sessions, 30mins tea breaks, lunch 12:30 - 14:00.

STIAS' doors open at 8:00, and there's some coffee but no breakfast; that should be covered by your B&B. I think it is good enough to arrive by 8:45, give or take a few minutes.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Sebastian Erdweg (have to leave before dinner)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Chung-Chieh Shan
* Friedrich Steimann (have to leave with Sebastian)
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop
* Julia Lawall

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke [[WG211/M25Barke| Toward Trustworthy LLM Generation: From Verifiable Proofs to Reliable Agents]]
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg: Differential Execution with Lexical Tracing
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Chung-chieh Shan
* Friedrich Steimann [[WG211/M25Steimann| Relative Multiplication of Infinite Relations]]
* Michel Steuwer [[WG211/M25Steuwer| Slotted E-Graphs]]
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk: [[WG211/M25VanWyk| On Scope Graphs and Reference Attribute Grammars: Answering Eelco's Questions]]

== Schedule ==

Tuesday, December 2

* 08:45 - 09:00 Assemble and welcome
** 09:00 - 09:45 Van Wyk
** 09:45 - 10:30 Barke
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Erdweg
** 11:45 - 12:30 Adams
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Fischer / Raselimo
** 14:45 - 15:30 Discussion
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 Discussion (cont.)

* 19:00 Dinner: [https://www.devier.co.za De Vier]

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

==== Arrivals and departures of attendants ====

* Friedrich will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Sebastian will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Julia will arrive on Monday morning at 5:50am (Air France from Paris) and leave on the following Monday morning at 7:55am; staying at The Avenues Guest House.
* Jacques will arrive a whole week before, Sunday Nov. 23, stay in Cape Town, then get to Stellenbosch on Monday 1 December, and leave on Saturday Dec 6 at 5 PM (Turkish Airlines TK 45). Staying at Laanhof.
* Shraddha will arrive on 1st Dec 11.40am and leave on Sunday 7th Dec 9.30pm; staying at the 5 Seasons Guest House.

WG211/M25Schedule

2025-12-01T16:59:43Z

Jacques: /* Talks and Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

We need to follow the venue's standard schedule (start at 9:00, out by 17:30 sharp), 90min sessions, 30mins tea breaks, lunch 12:30 - 14:00.

STIAS' doors open at 8:00, and there's some coffee but no breakfast; that should be covered by your B&B. I think it is good enough to arrive by 8:45, give or take a few minutes.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Sebastian Erdweg (have to leave before dinner)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Chung-Chieh Shan
* Friedrich Steimann (have to leave with Sebastian)
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop
* Julia Lawall

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke [[WG211/M25Barke| Toward Trustworthy LLM Generation: From Verifiable Proofs to Reliable Agents]]
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg: Differential Execution with Lexical Tracing
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Chung-chieh Shan
* Friedrich Steimann [[WG211/M25Steimann| Relative Multiplication of Infinite Relations]]
* Michel Steuwer [[WG211/M25Steuwer| Slotted E-Graphs]]
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk: [[WG211/M25VanWyk| On Scope Graphs and Reference Attribute Grammars: Answering Eelco's Questions]]

== Schedule ==

Tuesday, December 2

* 08:45 - 09:00 Assemble and welcome
** 09:00 - 09:45 Van Wyk
** 09:45 - 10:30 Barke
* 10:30 - 11:00 Coffee break
** 11:00 - 11:45 Erdweg
** 11:45 - 12:30 Adams
* 12:30 - 14:00 Lunch and break
** 14:00 - 14:45 Fischer / Raselimo
** 14:45 - 15:30 Discussion
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 Discussion (cont.)

* 19:00 Dinner:

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

==== Arrivals and departures of attendants ====

* Friedrich will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Sebastian will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Julia will arrive on Monday morning at 5:50am (Air France from Paris) and leave on the following Monday morning at 7:55am; staying at The Avenues Guest House.
* Jacques will arrive a whole week before, Sunday Nov. 23, stay in Cape Town, then get to Stellenbosch on Monday 1 December, and leave on Saturday Dec 6 at 5 PM (Turkish Airlines TK 45). Staying at Laanhof.
* Shraddha will arrive on 1st Dec 11.40am and leave on Sunday 7th Dec 9.30pm; staying at the 5 Seasons Guest House.

WG211/M25Schedule

2025-11-21T19:14:28Z

Jacques: /* Arrivals and departures of attendants */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

Note that STIAS doesn't serve breakfast before the meeting starts, but that should be covered by your B&B.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Sebastian Erdweg (have to leave before dinner)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Chung-Chieh Shan
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks and Schedule ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke [[WG211/M25Barke | Toward Trustworthy LLM Generation: From Verifiable Proofs to Reliable Agents]]
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Chung-chieh Shan
* Friedrich Steimann [[WG211/M25Steimann | Relative Multiplication of Infinite Relations ]]
* Michel Steuwer [[WG211/M25Steuwer | Slotted E-Graphs ]]
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk TBD

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

==== Arrivals and departures of attendants ====

* Friedrich will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Julia will arrive on Monday morning at 5:50am (Air France from Paris) and leave on the following Monday morning at 7:55am; staying at The Avenues Guest House.
* Jacques will arrive a whole week before, Sunday Nov. 23, stay in Cape Town, then get to Stellenbosch on Monday 1 December, and leave on Saturday Dec 6 at 5 PM (Turkish Airlines TK 45). Staying at Laanhof.
*  Shraddha will arrive on 1st Dec 11.40am and leave on Sunday 7th Dec 9.30pm; staying at the 5 Seasons Guest House.

WG211/M25Barke

2025-11-21T19:13:13Z

Jacques: Created page with "Toward Trustworthy LLM Generation: From Verifiable Proofs to Reliable Agents Verifiable programming provides a concrete foundation for trustworthy LLM generation. This talk introduces DeepProof-32B, a 32-billion-parameter reasoning model designed for program verification and trained with reinforcement learning from verifiable rewards, achieving state-of-the-art performance among open models. The first part distills lessons from building models that can reason about thei..."

Toward Trustworthy LLM Generation: From Verifiable Proofs to Reliable Agents

Verifiable programming provides a concrete foundation for trustworthy LLM generation. This talk introduces DeepProof-32B, a 32-billion-parameter reasoning model designed for program verification and trained with reinforcement learning from verifiable rewards, achieving state-of-the-art performance among open models. The first part distills lessons from building models that can reason about their own steps and shows how these principles extend naturally to domains such as test-case generation and program optimization.

The second part builds this foundation by examining how the same requirements for traceability, verifiability, and structured reasoning apply when LLMs act as agents. Real-world deployments in retail, airline operations, incident management, and Microsoft 365 Copilot demand not only correct generation, but interpretable decision-making. I present a debugging framework that analyzes multi-step agent trajectories, introduces a taxonomy of failure modes, and describes a “library learning” technique that synthesizes reusable reasoning abstractions on the fly. Together, these two threads chart a path toward the next generation of accurate, reliable, and safe LLM systems.

WG211/M25Schedule

2025-11-21T19:12:50Z

Jacques: /* Talks and Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

Note that STIAS doesn't serve breakfast before the meeting starts, but that should be covered by your B&B.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Sebastian Erdweg (have to leave before dinner)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Chung-Chieh Shan
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks and Schedule ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke [[WG211/M25Barke | Toward Trustworthy LLM Generation: From Verifiable Proofs to Reliable Agents]]
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Chung-chieh Shan
* Friedrich Steimann [[WG211/M25Steimann | Relative Multiplication of Infinite Relations ]]
* Michel Steuwer [[WG211/M25Steuwer | Slotted E-Graphs ]]
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk TBD

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

==== Arrivals and departures of attendants ====

* Friedrich will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Julia will arrive on Monday morning at 5:50am (Air France from Paris) and leave on the following Monday morning at 7:55am; staying at The Avenues Guest House.
* Jacques will arrive a whole week before, Sunday Nov. 23, stay in Cape Town, then get to Stellenbosch on Monday 1 December, and leave on Saturday Dec 6 at 5 PM (Turkish Airlines TK 45). Staying at Laanhof.

WG211/M25Schedule

2025-11-19T16:51:28Z

Jacques: /* Arrivals and departures of attendants */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

Note that STIAS doesn't serve breakfast before the meeting starts, but that should be covered by your B&B.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Sebastian Erdweg (have to leave before dinner)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Chung-Chieh Shan
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks and Schedule ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Chung-chieh Shan
* Friedrich Steimann [[WG211/M25Steimann | Relative Multiplication of Infinite Relations ]]
* Michel Steuwer [[WG211/M25Steuwer | Slotted E-Graphs ]]
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk TBD

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

==== Arrivals and departures of attendants ====

* Friedrich will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Julia will arrive on Monday morning at 5:50am (Air France from Paris) and leave on the following Monday morning at 7:55am; staying at The Avenues Guest House.
* Jacques will arrive a whole week before, Sunday Nov. 23, stay in Cape Town, then get to Stellenbosch on Monday 1 December, and leave on Saturday Dec 6 at 5 PM (Turkish Airlines TK 45). Staying at Laanhof.

WG211/M25Steuwer

2025-11-19T16:47:03Z

Jacques: Created page with "E-Graphs are a core data structure used in automatic reasoning and program optimization. They space-efficiently represent a set of equivalent terms. However, representing programs with bindings in e-graphs using existing techniques quickly defeats the efficiency purpose in many practical applications, as the e-graph represents alpha-equivalent terms many times. In this talk, I am going to present our work on Slotted E-Graphs that augment E-Graphs with a build-in notion..."

E-Graphs are a core data structure used in automatic reasoning and program optimization.
They space-efficiently represent a set of equivalent terms.

However, representing programs with bindings in e-graphs using existing techniques quickly defeats the efficiency purpose in many practical applications, as the e-graph represents alpha-equivalent terms many times.

In this talk, I am going to present our work on Slotted E-Graphs that augment E-Graphs with a build-in notion of binders.
By taking inspirations from the nominal approach, we are able to build a data-structure that is capable of space-efficiently representing programs with binders and the guarantee that alpha-equivalent terms are represented uniquely.

This talk presents work that has been published at PLDI 2025.

WG211/M25Schedule

2025-11-19T16:46:44Z

Jacques: /* Talks and Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

Note that STIAS doesn't serve breakfast before the meeting starts, but that should be covered by your B&B.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Sebastian Erdweg (have to leave before dinner)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Chung-Chieh Shan
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks and Schedule ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Chung-chieh Shan
* Friedrich Steimann [[WG211/M25Steimann | Relative Multiplication of Infinite Relations ]]
* Michel Steuwer [[WG211/M25Steuwer | Slotted E-Graphs ]]
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk TBD

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

==== Arrivals and departures of attendants ====

* Friedrich will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Julia will arrive on Monday morning at 5:50am (Air France from Paris) and leave on the following Monday morning at 7:55am; staying at The Avenues Guest House.

WG211/M25Schedule

2025-11-19T16:46:28Z

Jacques: /* Talks and Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

Note that STIAS doesn't serve breakfast before the meeting starts, but that should be covered by your B&B.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Sebastian Erdweg (have to leave before dinner)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Chung-Chieh Shan
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks and Schedule ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Chung-chieh Shan
* Friedrich Steimann [[WG211/M25Steimann | "Relative Multiplication of Infinite Relations ]]
* Michel Steuwer [[WG211/M25Steuwer | Slotted E-Graphs ]]
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk TBD

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

==== Arrivals and departures of attendants ====

* Friedrich will arrive on Monday morning (Condor flight DE2290, ETA 10:45 am) and leave on Friday evening (DE2291 at 7:50 pm); will stay at Evergreen Manor.
* Julia will arrive on Monday morning at 5:50am (Air France from Paris) and leave on the following Monday morning at 7:55am; staying at The Avenues Guest House.

WG211/M25Schedule

2025-11-12T19:53:40Z

Jacques: /* Talks and Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

Note that STIAS doesn't serve breakfast before the meeting starts, but that should be covered by your B&B.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Yuito Murase
* Klaus Ostermann
* Chung-Chieh Shan
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Ulrik Pagh Schultz Lundquist
* Sven-Bodo Scholz ? (TBC)
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* [https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks and Schedule ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Julia Lawall TBD
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Ulrik Pagh Schultz Lundquist [[WG211/M25Lundquist| The E-CoRe Project: Energy-efficient Computing via Reversibility]]
* Chung-chieh Shan
* Friedrich Steimann "Relative Multiplication of Infinite Relations"
* Michel Steuwer
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk TBD

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

WG211/M25Schedule

2025-11-10T20:31:44Z

Jacques: /* Talks and Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

Note that STIAS doesn't serve breakfast before the meeting starts, but that should be covered by your B&B.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Klaus Ostermann
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Ulrik Pagh Schultz Lundquist
* Sven-Bodo Scholz ? (TBC)
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks and Schedule ==

The following people have confirmed they will giving a talk:

* Michael D. Adams
* Shraddha Barke
* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Cezary Kaliszyk
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Ulrik Pagh Schultz Lundquist [[WG211/M25Lundquist| The E-CoRe Project: Energy-efficient Computing via Reversibility]]
* Chung-chieh Shan
* Friedrich Steimann "Relative Multiplication of Infinite Relations"
* Michel Steuwer
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk TBD

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

WG211/M25Schedule

2025-11-10T20:29:19Z

Jacques: /* Guests and Observers */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

Note that STIAS doesn't serve breakfast before the meeting starts, but that should be covered by your B&B.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Shraddha Barke
* Jacques Carette (+1)
* Bernd Fischer
* Cezary Kaliszyk
* Ohad Kammar
* Klaus Ostermann
* Michel Steuwer
* Eric Van Wyk
* Jeremy Yallop

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Ulrik Pagh Schultz Lundquist
* Sven-Bodo Scholz ? (TBC)
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* [https://michaeldadams.org/ Michael Adams]
* [https://www.microsoft.com/en-us/research/people/sbarke/ Shraddha Barke]
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* https://ckaliszyk.github.io/ Cezary Kaliszyk]
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* [https://steuwer.info/ Michel Steuwer]

== Talks and Schedule ==

The following people have confirmed they will giving a talk:

* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Yuito Murase and Atsushi Igarashi [[WG211/M25Murase| Refined^2 Environment Classifiers]]
* Ulrik Pagh Schultz Lundquist [[WG211/M25Lundquist| The E-CoRe Project: Energy-efficient Computing via Reversibility]]
* Chung-chieh Shan
* Friedrich Steimann "Relative Multiplication of Infinite Relations"
* Jeremy Yallop [[WG211/M25Yallop| Frex: Dependently Typed Algebraic Simplification]]
* Eric Van Wyk TBD

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

WG211/M25Yallop

2025-11-07T16:07:58Z

Jacques: Created page with "(joint work with Guillaume Allais, Edwin Brady, Nathan Corbyn and Ohad Kammar) We present a new design for an algebraic simplification library structured around concepts from universal algebra: theories, models, homomorphisms, and universal properties of free algebras and free extensions of algebras. The library's dependently typed interface guarantees that both built-in and user-defined simplification modules are terminating, sound, and complete with respect to a well..."

(joint work with Guillaume Allais, Edwin Brady, Nathan Corbyn and Ohad Kammar)

We present a new design for an algebraic simplification library structured around concepts from universal algebra: theories,
models, homomorphisms, and universal properties of free algebras and free extensions of algebras.

The library's dependently typed interface guarantees that both built-in and user-defined simplification modules are terminating,
sound, and complete with respect to a well-specified class of equations.

We have implemented the design in the Idris 2 and Agda dependently typed programming languages and shown that it supports modular extension to new theories, proof extraction and certification, goal extraction via reflection, and interactive development.

WG211/M25Schedule

2025-11-07T16:07:38Z

Jacques: /* Talks and Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

Note that STIAS doesn't serve breakfast before the meeting starts, but that should be covered by your B&B.

=== Group dinners ===

Stellenbosch has many restaurants, but they get quite busy from mid-November. I have thus made dinner reservations for 19:00 each night:
* Tuesday: [https://www.devier.co.za De Vier]
* Wednesday: [https://bertusbasson.com/#spek-bone Spek en Bone]
* Thursday: [https://devleispaleis.co.za De Vleispaleis]

For people attending the excursion, I have made a reservation at 19:30:
* Friday: [https://www.de-eetkamer.co.za De Eetkamer]

All restaurants are within walking distance from the old town. All restaurants have vegetarian options available, despite their names ;-).

=== Group excursion ===

I have arranged a group excursion on Friday, Dec 5. We will be visiting Boulder's Beach for penguin watching and take the cable car up to [https://en.wikipedia.org/wiki/Table_Mountain Table Mountain], with time for a walk at the plateau. We will be doing a wine tasting along the way - this is the winelands, after all!

Note that Table Mountain has a notoriously fickle weather, and could be shrouded in clouds (the so called "table cloth") any time. If the [https://www.tablemountain.net/plan-your-visit/getting-here weather] doesn't co-operate, we will drive to Cape of Good Hope as a backup.

Departure will likely be around 8:30 or 9:00, return to Stellenbosch should be around 18:00 or 18:30, depending on traffic.

Please sign up here if you plan to attend.
* Bernd Fischer

=== Registration fee ===

Registration fee for the meeting is EUR 275 / ZAR 5500; this covers all lunches on the meeting days and the dinners Tuesday - Thursday (including reasonable amounts of drinks ;-). Additional dinner tickets for partners will be EUR 150 / ZAR 3000.

The cost for the [[WG211/M25Schedule#Group excursion|excursion]] on Dec 5 will be EUR 125 / ZAR 2500 (based on 16 people attending; the price will go up slightly if fewer people attend, because of the fixed bus hire costs); this includes transport, entrance fees at Boulder's Beach, the Table Mountain cable car, boxed lunch and wine tasting, and dinner at [https://www.de-eetkamer.co.za De Eetkamer] in Stellenbosch.

Payment is in cash (either in Euros or in Rand) on arrival, or via electronic bank transfer; please mail me for the account details, if you want to use that option. I will issue a signed receipt on University stationary for the amount paid in the currency used.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Ulrik Pagh Schultz Lundquist
* Sven-Bodo Scholz ? (TBC)
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* Shraddha Barke
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* Cezary Kaliszyk
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* Michel Steuwer

== Talks and Schedule ==

The following people have confirmed they will giving a talk:

* Jacques Carette [[WG211/M25Carette| Definite Folds]]
* Sebastian Erdweg
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer| Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Ohad Kammar [[WG211/M25Kammar| Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST)]]
* Ulrik Pagh Schultz Lundquist [[WG211/M25Lundquist| The E-CoRe Project: Energy-efficient Computing via Reversibility]]
* Chung-chieh Shan
* Friedrich Steimann "Relative Multiplication of Infinite Relations"
* Jeremy Yallop [[WG211/M25Yallop | Frex: Dependently Typed Algebraic Simplification ]]

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [https://bettinashuttle.co.za/ Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the old Mountain passes, like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town, and "poorts" (i.e., mountain notches), like [https://en.wikipedia.org/wiki/Seweweekspoort| Seweweekspoort].
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

WG211/M25Kammar

2025-11-03T17:25:18Z

Jacques: Created page with "I will describe work in progress implementing SMTLIB bindings in Idris 2. The bindings are well-scoped and intrinsically typed, and support holes and type-and-scope-safe splicing of query fragments. Since SMTLIB describes upwards of 20 different combinations of features, this is an instance of the Expression Problem. To work around it, we develop the modular abstract syntax trees (MAST) library. It provides generic, type and scope safe traversals of splicing of code frag..."

I will describe work in progress implementing SMTLIB bindings in Idris 2. The bindings are well-scoped and intrinsically typed, and support holes and type-and-scope-safe splicing of query fragments. Since SMTLIB describes upwards of 20 different combinations of features, this is an instance of the Expression Problem. To work around it, we develop the modular abstract syntax trees (MAST) library. It provides generic, type and scope safe traversals of splicing of code fragments into holes.

WG211/M25Schedule

2025-11-03T17:25:00Z

Jacques: /* Talks and Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

Note that STIAS doesn't serve breakfast before the meeting starts, but that should be covered by your B&B.

=== Group excursion ===

Please let me know if you are interested in an organized post-meeting full-day group excursion. The "classic" tour is Boulder's Beach for penguin watching, and Cape of Good Hope; other alternatives are Table Mountain, Cape Town Aquarium, or Robben Island (the apartheid-era prison).

=== Registration ===

'''NOTE: this is still preliminary.'''
Registration fees will be around USD 350 / EUR 300; this will cover all lunches on the meeting days and the dinners Tuesday - Thursday. Additional dinner tickets for partners will be USD 175 / EUR 150.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Ulrik Pagh Schultz Lundquist
* Sven-Bodo Scholz ? (TBC)
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* Shraddha Barke
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* Cezary Kaliszyk
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* Michel Steuwer

== Talks and Schedule ==

The following people have confirmed they will giving a talk:

* Jacques Carette [[WG211/M25Carette | Definite Folds]]
* Sebastian Erdweg
* Bernd Fischer (or maybe Moeketsi Raselimo) [[WG211/M25Fischer | Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Ohad Kammar [[WG211/M25Kammar | Intrinsically typed and well-scoped SMTLIB FFI bindings with modular abstract syntax trees (MAST) ]]
* Chung-chieh Shan
* Friedrich Steimann

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [http://www.bettinashuttle.co.za/home Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the "poorts" (ie old Mountain passes), like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town.
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

WG211/M25Schedule

2025-11-03T17:18:33Z

Jacques: /* Talks and Schedule */

= IFIP Working Group 2.11, Twenty-fifth Meeting =

== December 2-5, 2025, Stellenbosch, South Africa ==

The meeting will be held in Stellenbosch, South Africa, hosted by [mailto:bfischer@sun.ac.za Bernd Fischer]. The meeting is planned for 3.5 days, with a half day on December 5. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will be held at the Wallenberg Center of the [http://stias.ac.za/ Stellenbosch Institute for Advanced Study] ([https://maps.app.goo.gl/AZg9SFDFsrLBL8Dr7 Streetview]). This is to the east of the [http://en.wikipedia.org/wiki/Stellenbosch_University Stellenbosch University] Campus ([https://www.sun.ac.za/english/welcome/Documents/Main%20campus%20map%20revised.pdf Campus map]). Most B&B's, hotels, and restaurants are within 10-15mins walk.

Note that STIAS doesn't serve breakfast before the meeting starts, but that should be covered by your B&B.

=== Group excursion ===

Please let me know if you are interested in an organized post-meeting full-day group excursion. The "classic" tour is Boulder's Beach for penguin watching, and Cape of Good Hope; other alternatives are Table Mountain, Cape Town Aquarium, or Robben Island (the apartheid-era prison).

=== Registration ===

'''NOTE: this is still preliminary.'''
Registration fees will be around USD 350 / EUR 300; this will cover all lunches on the meeting days and the dinners Tuesday - Thursday. Additional dinner tickets for partners will be USD 175 / EUR 150.

=== Members attending ===

Please add your name to the following list (alphabetical by last name, please) if you are planning to attend the meeting.

* Jacques Carette
* Sebastian Erdweg
* Bernd Fischer
* Ohad Kammar
* Julia Lawall
* Klaus Ostermann
* Chung-chieh Shan
* Ulrik Pagh Schultz Lundquist
* Sven-Bodo Scholz ? (TBC)
* Friedrich Steimann
* Eric Van Wyk
* Jeremy Yallop

=== Guests and Observers ===

* Shraddha Barke
* [https://www.tue.nl/en/research/researchers/loek-cleophas Loek Cleophas] (local observer)
* Cezary Kaliszyk
* Yuito Murase (as proxy of Atsushi Igarashi)
* [https://www.moeketsi.me/ Moeketsi Raselimo] (local observer)
* Michel Steuwer

== Talks and Schedule ==

The following people have confirmed they will giving a talk:

* Jacques Carette [[WG211/M25Carette | Definite Folds]]
* Bernd Fischer (or maybe Moeketsi) [[WG211/M25Fischer | Learning Lexical Structure of Black-Box Systems via Repeated String Edit Operations]]
* Chung-chieh Shan

== Travel ==

Note that the meeting will be in the southern Summer, just before the local holiday season starts in earnest, and Stellenbosch (and all of South Africa) will be getting busy, so arrange your flights and accommodation early.

==== Visa Information ====

Visitors from [http://en.wikipedia.org/wiki/Visa_policy_of_South_Africa most EU countries, US, Canada, Japan, Australia and most of South America] don't need a visa to visit South Africa. The complete (official) list is available at the [https://www.dha.gov.za/index.php/countries-exempt-from-sa-visas Department of Home Affairs]. Please contact [mailto:bfischer@sun.ac.za Bernd Fischer] if you need a visa to visit South Africa; please note that applications can take substantial amounts of time to get processed (although the backlog has been cleaned up after the last election...)

==== Vaccinations and Prophylaxis ====

South Africa requires yellow fever vaccinations for travelers arriving from a [https://www.southafrica.net/gl/en/travel/article/yellow-fever-entry-requirements risk area]; this includes most of South America and Central Africa, but excludes Europe, North America, Asia, and Oceania. You should probably have up-to-date standard vaccinations (such as tetanus) as you would have for travel in Europe or North America. Malaria prophylaxis is only required if you go to Kruger National Park or Victoria Falls.

The medical system is very good around Stellenbosch, but sometimes less so in other parts of the country. Check with your (travel) insurance whether they cover your trip.

==== Getting to Stellenbosch ====

The closest airport to Stellenbosch is [https://en.wikipedia.org/wiki/Cape_Town_International_Airport Cape Town International (CPT / FACT)]. There are direct flights from London (Virgin, BA), Amsterdam (KLM), Paris (Air France), Frankfurt (Condor, Lufthansa), Munich (Lufthansa), Zuerich (Edelweiss), Istanbul (Turkish Airlines), Doha (Qatar Airways), Dubai (Emirates), Addis Ababa (Ethiopian), Washington (United), Newark (United), Atlanta (Delta), and Singapore (Singapore Airlines). Note that some of these flights are seasonal and operate only during the southern Summer, so they might not show up yet. There are also regional connections to many places in southern Africa (e.g., Windhoek).

Further connections (e.g., from India, East Asia, Australia, or South America) are available with a transfer in Johannesburg. I recommend to fly into Cape Town, if feasible, because the transfer in Johannesburg requires you to clear immigration and customs (like in the US), which can be a bit unpredictable.

Flight prices vary of course wildly. I have recently paid anything between EUR 700 and 1200 for a Germany round trip, and EUR 1500 for a California round trip.

CPT is about 35km from Stellenbosch; there is no public transport, but Uber is widely available, cheap (< EUR 20 to Stellenbosch), and I always take it. Please be aware that taxi touts will try to talk you into a metered taxi as soon as you leave customs; I always politely ignore them.

If you prefer a pre-booked airport shuttle, try:
* [http://www.bettinashuttle.co.za/home Bettina's]
* [http://www.shuttleup.co.za/ Shuttle Up]

Stellenbosch is small and easily navigable by foot, and the venue is in walking distance to most hotels and B&Bs. You won't need a rental car unless you are planning to go on a road-trip before or after the conference. There is no public transport in Stellenbosch; do *not* take the train to Cape Town, or a minibus taxi.

==== Accommodation ====

Stellenbosch does not have big corporate hotels but offers a wide variety of different smaller accommodation options. Most centrally located B&Bs (look for the "Stellenbosch Central" or "Mostertsdrift" areas) will be in the range from EUR 80 to EUR 150 per night; there are also Airbnb-style accommodations but they tend to be more in the suburbs, and are not necessarily cheaper. Many wine farms offer luxury accommodation, but they are typically out of town and require a rental car.

Below are a number of guest houses covering different price ranges. Note that I haven't stayed in any of these... Please make your own arrangements and please note that places begin to fill up.

'''Between Stias and the town center''':
* [https://avenuesguesthouse.co.za/ Avenues Guesthouse], 32 Die Laan
* [https://beauclair-guest-cottage.hotels-of-stellenbosch.com/en/ Beauclair Guest Cottage], 1 Coetzenburg Road
* [https://www.bonneesperance.com/ Bonne Esperance], corner of Neethling and Van Riebeeck
* [https://caledon-villa.hotels-of-stellenbosch.com/en/ Caledon Villa], 7 Neethling Street
* [https://www.dehaasliving.co.za/die-laan-2/ De Haas Luxury Living - Die Laan], 2 Die Laan
* [https://www.dehaasliving.co.za/die-laan-40/ De Haas Luxury Living - Die Laan 40], 40 Die Laan
* [https://www.evergreenmanor.co.za/ Evergreen Manor], 11 Murray Street
* [https://koloniestuin.co.za/ Kolonie's Tuin], 22 Die Laan
* [https://www.laanhof.co.za/ Laanhof], 28 Die Laan (self-catering)
* [https://www.lifeandleisure.co.za/ Life & Leisure], 20 Van Riebeeck St
* [https://www.middedorp.com/ Middedorp Manor], 14 Neethling Street
* [https://www.minseriecollection.co.za/ Minserie Collection], Minserie Street (self-catering)
* [https://thelivingjourneycollection.co.za/river-manor/ River Manor], 6-8 Die Laan
* [https://www.roosenwijn.co.za/ Roosenwijn Guesthouse], 14 Van Riebeeck Street
* [https://thelivingjourneycollection.co.za/river-manor/ De Haas Luxury Living - Villa Grande], 1 Keeroom Street

'''Mostertsdrift''' (east of Stias):
* [https://www.5-seasons.co.za/ 5 Seasons Guesthouse], 60 Van Der Stel Street
* [https://lanzerac.co.za/ Lanzerac Wine Estate], Lanzerac Road (wine estate in walking distance from Stias)
* [https://www.stellenboschmanor.com/ Stellenbosch Manor], 2 Van Der Stel Street
* [https://summerwood.co.za/ Summerwood Guest House], 28 Jonkershoek Road
* [https://vanderstelmanor.com/ Van Der Stel Manor], 64 Van Der Stel Street

'''Town center''':
* [https://www.batavia-stellenbosch.co.za/ Batavia Boutique Hotel], 12 Louw Street
* [https://coopmanhuijs.co.za/ Coopmanhuijs Boutique Hotel & Spa], 33 Church Stree
* [https://www.eendracht-hotel.com/ Eendracht Hotel & Self Catering], 160 Drop Street
* [https://www.justjoey.co.za/ Just Joey Lodge], 13 Noordwal-Wes
* [https://stellenboschhotel.co.za/ Stellenbosch Hotel], corner of Dorp & Andringa

==== Security ====

South Africa has a reputation as an unsafe country but most crimes happen in township areas, and the center of Stellenbosch is generally safe; walking around town, or from town to the guesthouses in Mostertsdrift is fine, even after dinner. However, there are a few things to keep in mind:
* Do not flash your valuables (phone, wallet, camera) in public.
* Do not hand over your ATM/credit card - servers will bring a machine to your table (or will ask you to pay at the counter); if you withdraw money from an ATM, check that nobody is lurking around, and do not accept "help" from people.
* Do '''not''' walk or drive into any township (in Stellenbosch, that means Kayamandi and Cloetesville); if you are interested, you can book guided tours.
* Do '''not''' take the train between Cape Town and Stellenbosch (or trains around Cape Town).

==== Weather ====

Early December is late spring in South Africa. The weather in Stellenbosch ''should'' be nice - the average day-time highs are around 25C, night-time lows around 15C, and it ''should'' be dry. However, there are chances of an early heat wave, with temperatures above 30C, or (fortunately less likely) a late rain front with temperatures dropping by 5-10 degrees.

==== Pre- / post-meeting excursions ====

Here are a few ideas if you are planning to spend a few extra days in Stellenbosch or travel around the country:
* Spend the weekend in Cape Town and explore the city - Table Mountain is certainly a prime target. You could also go to Kirstenbosch Botanical Garden (although the prime bloom will be over then), and even climb Table Mountain from there (although this could be hot and strenuous that time of the year). Cape Town has quite a lot of night life, especially on the weekend.
* Explore the Stellenbosch surroundings. For this, you should probably get a rental car. There are literally hundreds of wine farms in the surroundings, if you want to go for a tasting. The Paarl Taal Monument (monument to the Afrikaans language) is an interesting cultural experience, and you can go on to the Paarl rock (large granite Boulder). Franschhoeck is a another cute town.
* Get out to the Cederberg Mountains - a nice mountainous area about 2-3hours north of Cape Town, with nice mountain walks (Wolfberg Cracks, some caves). You could stay at Clanwilliam, or look for a place in the mountain reserve (look for Algeria). The roads are mostly dirt (ie unpaved) but we have driven them in a Polo...
* Hike the Bosmanskloof Traverse (either as an overnight hike, or as a day-hike), staying in McGregor or Grayton.
* Go to Calitzdorp for Port tasting, Oudtshoorn for the ostriches (and the very tourist-trappy Cango Caves, a huge limestone cave), and drive some of the "poorts" (ie old Mountain passes), like [http://en.wikipedia.org/wiki/Swartberg_Pass Swartbergpass] into Prince Albert, a quaint Karoo town.
* Go shark cage diving in Struisbaai.

Except for the Cape Town weekend, most trips will require a rental car. You can get an uber or a dedicated driver for a wine tasting tour, which is probably a smart idea in the first place...

'''Safaris.'''
There are no lions running around in Stellenbosch ;-). The closest ones are at the [http://www.lionrescue.org.za/ Drakenstein Lion Park], which is basically a retirement home for lions. There are a few private game reserves within two to three hours drive of Stellenbosch (e.g., [https://grgamelodge.co.za/ Garden Route Game Lodge] or [http://www.sanbona.com/propertydefault.asp?MicroSiteID=3 Sanbona]), but they are not cheap. The closest National Parks with substantial wildlife are [http://www.sanparks.co.za/parks/mountain_zebra/ Mountain Zebra NP] and [http://www.sanparks.org/parks/addo/ Addo Elephant NP] (about 8-10hrs drive from Stellenbosch, but Addo is quite close to Port Elizabeth, which is one hour by plane from Cape Town). If you plan to visit [http://www.sanparks.org/parks/kruger/ Krueger NP] you should probably fly with a stop-over in Johannesburg, and plan on at least four extra days.

WG211/M25Carette

2025-10-31T18:23:28Z

Jacques: Created page with "Notions of derivative abound in functional programming. An obvious question arises: what about integrals? It turns out that folds are the analogous concept. Pursuing the analogy leads us to a proper notion of "definite fold" corresponding to definite integrals (and sums and products and ...). Many concepts are needed along the way (Route, Pointed type, etc). In return, incremental and parallel versions of fold arise naturally. The correct notion of indefinite fold is a l..."

Notions of derivative abound in functional programming. An obvious question arises: what about integrals? It turns out that folds are the analogous concept. Pursuing the analogy leads us to a proper notion of "definite fold" corresponding to definite integrals (and sums and products and ...). Many concepts are needed along the way (Route, Pointed type, etc). In return, incremental and parallel versions of fold arise naturally. The correct notion of indefinite fold is a little more elusive, making a "Fundamental Theorem of Fold-Calculus" delicate.

WG211/M25Schedule

2025-10-31T18:23:05Z

Jacques: /* Talks and Schedule */

WG211/M25Schedule

2025-10-31T18:19:32Z

Jacques: /* Talks and Schedule */

WG211/M25Schedule

2025-10-31T18:15:30Z

Jacques: /* Talks and Schedule */

WG211/M25Schedule

2025-09-22T17:10:45Z

Jacques: /* Guests and Observers */

WG211/M25Schedule

2025-09-08T18:59:46Z

Jacques: /* Guests and Observers */

WG211/M25Schedule

2025-08-27T15:53:41Z

Jacques: /* Members attending */

Main Page

2025-08-27T14:13:51Z

Jacques: /* Current Members */

Welcome to the homepage of [http://www.ifip.org/ifiptc2/ IFIP TC-2] working group on Program Generation (WG 2.11)

=Program Generation (WG 2.11)=

Program generation has the potential to revolutionize software development in the same way that automation and components revolutionized manufacturing. Current research in this area targets a host of technical problems both at the foundational and engineering levels. The aim of this IFIP Working Group of researchers and practitioners is to promote progress in this area.

==Current Activity==

'''Next meeting''': [[WG211/M25Schedule | Twenty-fifth meeting in Stellenbosch, South Africa ]] (December 2-5, 2025)

==Current Members==
{|
|[https://namin.seas.harvard.edu/ Nada Amin] (US)
|[http://www.irisa.fr/celtique/blazy/ Sandrine Blazy] (FR)
|[https://www.type-driven.org.uk/edwinb Edwin Brady] (UK)
|-
|[http://www.cas.mcmaster.ca/~carette/ Jacques Carette] (CA), Chair
|[http://ti.arc.nasa.gov/profile/edenney/ Ewen Denney] (US)
|[https://www.pl.informatik.uni-mainz.de/erdweg/ Sebastian Erdweg] (DE)
|-
|[http://www.cs.sun.ac.za/~bfischer/ Bernd Fischer] (ZA)
|[http://www.cs.ox.ac.uk/jeremy.gibbons/ Jeremy Gibbons] (UK)
|[http://www.diku.dk/~glueck Robert Glück] (DK)
|-
|[http://www.cs.st-andrews.ac.uk/~kh/Home/Home.html Kevin Hammond] (UK)
|[http://www.fos.kuis.kyoto-u.ac.jp/~igarashi/index.html.en Atsushi Igarashi] (JP)
|[http://denotational.co.uk/ Ohad Kammar] (UK)
|-
|[http://www.cs.tsukuba.ac.jp/~kam/ Yukiyoshi Kameyama] (JP)
|[http://www.doc.ic.ac.uk/~phjk/ Paul Kelly] (UK)
|[http://okmij.org/ftp/ Oleg Kiselyov] (JP)
|-
|[http://www.uni-koblenz.de/~laemmel Ralf Lämmel] (DE)
|[http://pagesperso-systeme.lip6.fr/Julia.Lawall/ Julia Lawall] (FR)
|[https://www.cs.drexel.edu/~mainland/ Geoffrey Mainland] (US)
|-
|[https://pdmosses.github.io Peter Mosses] (UK, NL)
|[http://ps.informatik.uni-tuebingen.de/team/ostermann/ Klaus Ostermann] (DE)
|[http://www.inf.ethz.ch/personal/markusp Markus Püschel] (CH)
|-
|[http://creichen.net/ Christoph Reichenbach] (SE)
|[http://tiarkrompf.github.io/ Tiark Rompf] (US)
|[https://www.ru.nl/personen/scholz-s Sven-Bodo Scholz] (NL)
|-
|[http://www.mmmi.sdu.dk/~ups Ulrik Pagh Schultz] (DK)
|[http://homes.soic.indiana.edu/ccshan/ Chung-chieh Shan] (US)
|[http://raintown.org/ Satnam Singh] (US)
|-
|[http://www.cs.umass.edu/~yannis/ Yannis Smaragdakis] (GR)
|[https://www.fernuni-hagen.de/ps/team/friedrich.steimann.shtml Friedrich Steimann] (DE)
|[http://www-users.cs.umn.edu/~evw/ Eric Van Wyk] (US)
|-
|[https://www.cl.cam.ac.uk/~jdy22/ Jeremy Yallop] (UK), Vice-Chair
|[https://grammarware.net/ Vadim Zaytsev] (NL)
|}

Emeritus members
{|
|[http://www.infosun.fmi.uni-passau.de/cl/staff/lengauer/ Christian Lengauer] (DE)
|[http://www.cs.rice.edu/~taha/ Walid Taha] (SE)
|}

==Past Activity==

* [[WG211/M24Schedule | Twenty-fourth meeting in Edinburgh, Scotland, UK ]]
* [[WG211/M23Schedule | Twenty-third meeting in Philadelphia, Pennsylvania, USA ]]
* [[WG211/M22Schedule | Twenty-second meeting in Delft, The Netherlands ]]
* [[WG211/M21Schedule | Twenty-first meeting in Odense, Denmark ]]
* [[WG211/M20Schedule | Twentieth meeting in Paris, France ]]
* [[WG211/M19Schedule | Nineteenth meeting in Salem, USA ]]
* [[WG211/M18Schedule | Eighteenth meeting in Kyoto, Japan ]]
* [[WG211/M17Schedule | Seventeenth meeting in Koblenz, Germany ]]
* [[WG211/M16Schedule | Sixteenth meeting in Bloomington, Indiana, USA]]
* [[WG211/M15Schedule | Fifteenth meeting in London, England]]
* [[WG211/M14Schedule | Fourteenth meeting in Stellenbosch, South Africa]]
* [[WG211/M13Schedule | Thirteenth meeting in Pittsburgh, USA]]
* [[WG211/M12Schedule | Twelfth meeting in Minneapolis, USA]]
* [[WG211/M11Schedule | Eleventh meeting in Halmstad, Sweden]]
* [[WG211/M10Schedule | Tenth meeting in Bordeaux, France]]
* [[WG211/M9Schedule | Ninth meeting in Waterloo, Canada]]
* [[WG211/M8Schedule | Eighth meeting in St. Andrews Scotland]]
* [[WG211/M7Schedule | Seventh meeting in Mountain View, California]]
* [[WG211/M6Schedule | Sixth meeting in Passau]]
* [[WG211/M5Schedule | Fifth meeting in Copenhagen]]
* [[WG211/M4Schedule | Fourth meeting in Portland]]
* [[WG211/M3Schedule | Third meeting at Dagstuhl]]
* [[WG211/MeetingTwo | Second meeting at Rice, Houston, TX.]]
* [[WG211/MeetingOne | Kickoff meeting in St. Emilion]]

==Background==

* [[WG211/WG211-Aims-2011-02-25 | Current aims ]] of the working group, revised February 2011

* [[Media:aims-2003-09-01.txt | Initial aims ]] of the working group, as submitted to IFIP, September 2003).

* [http://www.infosun.fim.uni-passau.de/cl/papers/DSPG2004.html Compendium of papers] resulting from [https://www.dagstuhl.de/en/seminars/seminar-calendar/seminar-details/03131 Dagstuhl seminar] that lead directly to the WG 2.11.

==Past members==
A few past members include
{|
|[https://www.se.cs.uni-saarland.de/apel/ Sven Apel] (DE)
|[https://www.yale-nus.edu.sg/faculty/olivier-danvy/ Olivier Danvy] (<del>DK</del> SG)
|[https://www.infosun.fim.uni-passau.de/cl/staff/herrmann/ Christoph Herrmann] (DE)
|-
|[https://cs.illinois.edu/about/people/emeritus-faculty/kamin Sam Kamin] (US)
|[https://eelcovisser.org/ Eelco Visser] (NL)
|}

----

With the sudden and unexpected death of Prof. Eelco Visser, the IFIP WG
2.11 lost one of its founding members and a regular participant and central player in the group for close to two decades.

Eelco stood out by his calm demeanor and pleasant, sonoric voice. It gave him a special presence. Some time ago, he told us that he considered his first invitation to the WG as a pivotal event in his career and that he was very grateful for this. This was Dagstuhl Seminar 03131, which can be viewed as the conception event of WG 2.11.

Eelco implemented the group's goals more effectively and tangibly than many of us and he never made a big deal about it. The software systems he developed, be it Stratego, Spoofax or Researchr, have a far reach into the community and beyond. Eelco was always courteous, attentive and friendly but, being also passionate, he would not shy away from lively arguments. He was a pillar of strength and steadiness in the group. We will miss him dearly.

Main Page

2025-08-27T14:11:40Z

Jacques: /* Current Members */

Welcome to the homepage of [http://www.ifip.org/ifiptc2/ IFIP TC-2] working group on Program Generation (WG 2.11)

=Program Generation (WG 2.11)=

Program generation has the potential to revolutionize software development in the same way that automation and components revolutionized manufacturing. Current research in this area targets a host of technical problems both at the foundational and engineering levels. The aim of this IFIP Working Group of researchers and practitioners is to promote progress in this area.

==Current Activity==

'''Next meeting''': [[WG211/M25Schedule | Twenty-fifth meeting in Stellenbosch, South Africa ]] (December 2-5, 2025)

==Current Members==
{|
|[https://namin.seas.harvard.edu/ Nada Amin] (US)
|[http://www.irisa.fr/celtique/blazy/ Sandrine Blazy] (FR)
|[https://www.type-driven.org.uk/edwinb Edwin Brady] (UK)
|-
|[http://www.cas.mcmaster.ca/~carette/ Jacques Carette] (CA), Chair
|[http://ti.arc.nasa.gov/profile/edenney/ Ewen Denney] (US)
|[https://www.pl.informatik.uni-mainz.de/erdweg/ Sebastian Erdweg] (DE)
|-
|[http://www.cs.sun.ac.za/~bfischer/ Bernd Fischer] (ZA)
|[http://www.cs.ox.ac.uk/jeremy.gibbons/ Jeremy Gibbons] (UK)
|[http://www.diku.dk/~glueck Robert Glück] (DK)
|-
|[http://www.cs.st-andrews.ac.uk/~kh/Home/Home.html Kevin Hammond] (UK)
|[http://www.fos.kuis.kyoto-u.ac.jp/~igarashi/index.html.en Atsushi Igarashi] (JP)
|[http://denotational.co.uk/ Ohad Kammar] (UK)
|-
|[http://www.cs.tsukuba.ac.jp/~kam/ Yukiyoshi Kameyama] (JP)
|[http://www.doc.ic.ac.uk/~phjk/ Paul Kelly] (UK)
|[http://okmij.org/ftp/ Oleg Kiselyov] (JP)
|-
|[http://www.uni-koblenz.de/~laemmel Ralf Lämmel] (DE)
|[http://pagesperso-systeme.lip6.fr/Julia.Lawall/ Julia Lawall] (FR)
|[http://www.infosun.fmi.uni-passau.de/cl/staff/lengauer/ Christian Lengauer] (DE) (*)
|-
|[https://www.cs.drexel.edu/~mainland/ Geoffrey Mainland] (US)
|[https://pdmosses.github.io Peter Mosses] (UK, NL)
|[http://ps.informatik.uni-tuebingen.de/team/ostermann/ Klaus Ostermann] (DE)
|-
|[http://www.inf.ethz.ch/personal/markusp Markus Püschel] (CH)
|[http://creichen.net/ Christoph Reichenbach] (SE)
|[http://tiarkrompf.github.io/ Tiark Rompf] (US)
|-
|[https://www.ru.nl/personen/scholz-s Sven-Bodo Scholz] (NL)
|[http://www.mmmi.sdu.dk/~ups Ulrik Pagh Schultz] (DK)
|[http://homes.soic.indiana.edu/ccshan/ Chung-chieh Shan] (US)
|-
|[http://raintown.org/ Satnam Singh] (US)
|[http://www.cs.umass.edu/~yannis/ Yannis Smaragdakis] (GR)
|[http://www.cs.rice.edu/~taha/ Walid Taha] (SE) (*)
|-
|[https://www.fernuni-hagen.de/ps/team/friedrich.steimann.shtml Friedrich Steimann] (DE)
|[http://www-users.cs.umn.edu/~evw/ Eric Van Wyk] (US)
|[https://www.cl.cam.ac.uk/~jdy22/ Jeremy Yallop] (UK), Vice-Chair
|-
|[https://grammarware.net/ Vadim Zaytsev] (NL)
|}
(*) emeritus

==Past Activity==

* [[WG211/M24Schedule | Twenty-fourth meeting in Edinburgh, Scotland, UK ]]
* [[WG211/M23Schedule | Twenty-third meeting in Philadelphia, Pennsylvania, USA ]]
* [[WG211/M22Schedule | Twenty-second meeting in Delft, The Netherlands ]]
* [[WG211/M21Schedule | Twenty-first meeting in Odense, Denmark ]]
* [[WG211/M20Schedule | Twentieth meeting in Paris, France ]]
* [[WG211/M19Schedule | Nineteenth meeting in Salem, USA ]]
* [[WG211/M18Schedule | Eighteenth meeting in Kyoto, Japan ]]
* [[WG211/M17Schedule | Seventeenth meeting in Koblenz, Germany ]]
* [[WG211/M16Schedule | Sixteenth meeting in Bloomington, Indiana, USA]]
* [[WG211/M15Schedule | Fifteenth meeting in London, England]]
* [[WG211/M14Schedule | Fourteenth meeting in Stellenbosch, South Africa]]
* [[WG211/M13Schedule | Thirteenth meeting in Pittsburgh, USA]]
* [[WG211/M12Schedule | Twelfth meeting in Minneapolis, USA]]
* [[WG211/M11Schedule | Eleventh meeting in Halmstad, Sweden]]
* [[WG211/M10Schedule | Tenth meeting in Bordeaux, France]]
* [[WG211/M9Schedule | Ninth meeting in Waterloo, Canada]]
* [[WG211/M8Schedule | Eighth meeting in St. Andrews Scotland]]
* [[WG211/M7Schedule | Seventh meeting in Mountain View, California]]
* [[WG211/M6Schedule | Sixth meeting in Passau]]
* [[WG211/M5Schedule | Fifth meeting in Copenhagen]]
* [[WG211/M4Schedule | Fourth meeting in Portland]]
* [[WG211/M3Schedule | Third meeting at Dagstuhl]]
* [[WG211/MeetingTwo | Second meeting at Rice, Houston, TX.]]
* [[WG211/MeetingOne | Kickoff meeting in St. Emilion]]

==Background==

* [[WG211/WG211-Aims-2011-02-25 | Current aims ]] of the working group, revised February 2011

* [[Media:aims-2003-09-01.txt | Initial aims ]] of the working group, as submitted to IFIP, September 2003).

* [http://www.infosun.fim.uni-passau.de/cl/papers/DSPG2004.html Compendium of papers] resulting from [https://www.dagstuhl.de/en/seminars/seminar-calendar/seminar-details/03131 Dagstuhl seminar] that lead directly to the WG 2.11.

==Past members==
A few past members include
{|
|[https://www.se.cs.uni-saarland.de/apel/ Sven Apel] (DE)
|[https://www.yale-nus.edu.sg/faculty/olivier-danvy/ Olivier Danvy] (<del>DK</del> SG)
|[https://www.infosun.fim.uni-passau.de/cl/staff/herrmann/ Christoph Herrmann] (DE)
|-
|[https://cs.illinois.edu/about/people/emeritus-faculty/kamin Sam Kamin] (US)
|[https://eelcovisser.org/ Eelco Visser] (NL)
|}

----

With the sudden and unexpected death of Prof. Eelco Visser, the IFIP WG
2.11 lost one of its founding members and a regular participant and central player in the group for close to two decades.

Eelco stood out by his calm demeanor and pleasant, sonoric voice. It gave him a special presence. Some time ago, he told us that he considered his first invitation to the WG as a pivotal event in his career and that he was very grateful for this. This was Dagstuhl Seminar 03131, which can be viewed as the conception event of WG 2.11.

Eelco implemented the group's goals more effectively and tangibly than many of us and he never made a big deal about it. The software systems he developed, be it Stratego, Spoofax or Researchr, have a far reach into the community and beyond. Eelco was always courteous, attentive and friendly but, being also passionate, he would not shy away from lively arguments. He was a pillar of strength and steadiness in the group. We will miss him dearly.

WG211/M25Schedule

2025-08-06T15:56:57Z

Jacques: /* Observers */

WG211/M25Schedule

2025-08-06T15:51:20Z

Jacques: /* Members attending */

Main Page

2024-12-30T19:17:30Z

Jacques: remove a lot of dead stuff

Welcome to the homepage of [http://www.ifip.org/ifiptc2/ IFIP TC-2] working group on Program Generation (WG 2.11)

=Program Generation (WG 2.11)=

Program generation has the potential to revolutionize software development in the same way that automation and components revolutionized manufacturing. Current research in this area targets a host of technical problems both at the foundational and engineering levels. The aim of this IFIP Working Group of researchers and practitioners is to promote progress in this area.

==Current Activity==

'''Next meeting''': [[WG211/M25Schedule | Twenty-fifth meeting in Stellenbosch, South Africa ]] (in late 2025)

==Current Members==
{|
|[https://namin.seas.harvard.edu/ Nada Amin] (US)
|[http://www.irisa.fr/celtique/blazy/ Sandrine Blazy] (FR)
|[https://www.type-driven.org.uk/edwinb Edwin Brady] (UK)
|-
|[http://www.cas.mcmaster.ca/~carette/ Jacques Carette] (CA), Chair
|[http://ti.arc.nasa.gov/profile/edenney/ Ewen Denney] (US)
|[https://www.pl.informatik.uni-mainz.de/erdweg/ Sebastian Erdweg] (DE)
|-
|[http://www.cs.sun.ac.za/~bfischer/ Bernd Fischer] (ZA)
|[http://www.cs.ox.ac.uk/jeremy.gibbons/ Jeremy Gibbons] (UK)
|[http://www.diku.dk/~glueck Robert Glück] (DK)
|-
|[http://www.cs.st-andrews.ac.uk/~kh/Home/Home.html Kevin Hammond] (UK)
|[http://www.fos.kuis.kyoto-u.ac.jp/~igarashi/index.html.en Atsushi Igarashi] (JP)
|[http://denotational.co.uk/ Ohad Kammar] (UK)
|-
|[http://www.cs.cmu.edu/~ckaestne/ Christian Kästner] (US)
|[http://www.cs.tsukuba.ac.jp/~kam/ Yukiyoshi Kameyama] (JP)
|[http://www.doc.ic.ac.uk/~phjk/ Paul Kelly] (UK)
|-
|[http://okmij.org/ftp/ Oleg Kiselyov] (JP)
|[http://www.uni-koblenz.de/~laemmel Ralf Lämmel] (DE)
|[http://pagesperso-systeme.lip6.fr/Julia.Lawall/ Julia Lawall] (FR)
|-
|[http://www.infosun.fmi.uni-passau.de/cl/staff/lengauer/ Christian Lengauer] (DE) (*)
|[https://www.cs.drexel.edu/~mainland/ Geoffrey Mainland] (US)
|[https://pdmosses.github.io Peter Mosses] (UK, NL)
|-
|[http://ps.informatik.uni-tuebingen.de/team/ostermann/ Klaus Ostermann] (DE)
|[http://www.inf.ethz.ch/personal/markusp Markus Püschel] (CH)
|[http://creichen.net/ Christoph Reichenbach] (SE)
|-
|[http://tiarkrompf.github.io/ Tiark Rompf] (US)
|[https://www.ru.nl/personen/scholz-s Sven-Bodo Scholz] (NL)
|[http://www.mmmi.sdu.dk/~ups Ulrik Pagh Schultz] (DK)
|-
|[http://homes.soic.indiana.edu/ccshan/ Chung-chieh Shan] (US)
|[http://raintown.org/ Satnam Singh] (US)
|[http://www.cs.umass.edu/~yannis/ Yannis Smaragdakis] (GR)
|-
|[https://people.csail.mit.edu/asolar/ Armando Solar-Lezama] (US)
|[http://www.cs.rice.edu/~taha/ Walid Taha] (SE) (*)
|[https://www.fernuni-hagen.de/ps/team/friedrich.steimann.shtml Friedrich Steimann] (DE)
|-
|[http://www-users.cs.umn.edu/~evw/ Eric Van Wyk] (US)
|[https://www.cl.cam.ac.uk/~jdy22/ Jeremy Yallop] (UK), Vice-Chair
|[https://grammarware.net/ Vadim Zaytsev] (NL)
|}
(*) emeritus

==Past Activity==

* [[WG211/M24Schedule | Twenty-fourth meeting in Edinburgh, Scotland, UK ]]
* [[WG211/M23Schedule | Twenty-third meeting in Philadelphia, Pennsylvania, USA ]]
* [[WG211/M22Schedule | Twenty-second meeting in Delft, The Netherlands ]]
* [[WG211/M21Schedule | Twenty-first meeting in Odense, Denmark ]]
* [[WG211/M20Schedule | Twentieth meeting in Paris, France ]]
* [[WG211/M19Schedule | Nineteenth meeting in Salem, USA ]]
* [[WG211/M18Schedule | Eighteenth meeting in Kyoto, Japan ]]
* [[WG211/M17Schedule | Seventeenth meeting in Koblenz, Germany ]]
* [[WG211/M16Schedule | Sixteenth meeting in Bloomington, Indiana, USA]]
* [[WG211/M15Schedule | Fifteenth meeting in London, England]]
* [[WG211/M14Schedule | Fourteenth meeting in Stellenbosch, South Africa]]
* [[WG211/M13Schedule | Thirteenth meeting in Pittsburgh, USA]]
* [[WG211/M12Schedule | Twelfth meeting in Minneapolis, USA]]
* [[WG211/M11Schedule | Eleventh meeting in Halmstad, Sweden]]
* [[WG211/M10Schedule | Tenth meeting in Bordeaux, France]]
* [[WG211/M9Schedule | Ninth meeting in Waterloo, Canada]]
* [[WG211/M8Schedule | Eighth meeting in St. Andrews Scotland]]
* [[WG211/M7Schedule | Seventh meeting in Mountain View, California]]
* [[WG211/M6Schedule | Sixth meeting in Passau]]
* [[WG211/M5Schedule | Fifth meeting in Copenhagen]]
* [[WG211/M4Schedule | Fourth meeting in Portland]]
* [[WG211/M3Schedule | Third meeting at Dagstuhl]]
* [[WG211/MeetingTwo | Second meeting at Rice, Houston, TX.]]
* [[WG211/MeetingOne | Kickoff meeting in St. Emilion]]

==Background==

* [[WG211/WG211-Aims-2011-02-25 | Current aims ]] of the working group, revised February 2011

* [[Media:aims-2003-09-01.txt | Initial aims ]] of the working group, as submitted to IFIP, September 2003).

* [http://www.infosun.fim.uni-passau.de/cl/papers/DSPG2004.html Compendium of papers] resulting from [https://www.dagstuhl.de/en/seminars/seminar-calendar/seminar-details/03131 Dagstuhl seminar] that lead directly to the WG 2.11.

==Past members==
A few past members include
{|
|[https://www.se.cs.uni-saarland.de/apel/ Sven Apel] (DE)
|[https://www.yale-nus.edu.sg/faculty/olivier-danvy/ Olivier Danvy] (<del>DK</del> SG)
|[https://www.infosun.fim.uni-passau.de/cl/staff/herrmann/ Christoph Herrmann] (DE)
|-
|[https://cs.illinois.edu/about/people/emeritus-faculty/kamin Sam Kamin] (US)
|[https://eelcovisser.org/ Eelco Visser] (NL)
|}

----

With the sudden and unexpected death of Prof. Eelco Visser, the IFIP WG
2.11 lost one of its founding members and a regular participant and central player in the group for close to two decades.

Eelco stood out by his calm demeanor and pleasant, sonoric voice. It gave him a special presence. Some time ago, he told us that he considered his first invitation to the WG as a pivotal event in his career and that he was very grateful for this. This was Dagstuhl Seminar 03131, which can be viewed as the conception event of WG 2.11.

Eelco implemented the group's goals more effectively and tangibly than many of us and he never made a big deal about it. The software systems he developed, be it Stratego, Spoofax or Researchr, have a far reach into the community and beyond. Eelco was always courteous, attentive and friendly but, being also passionate, he would not shy away from lively arguments. He was a pillar of strength and steadiness in the group. We will miss him dearly.

WG211/M24Schedule

2024-12-04T11:19:14Z

Jacques: /* Scientific program */

= IFIP Working Group 2.11, Twenty-fourth Meeting =

== December 3rd (Tues) - 6th (Fri) in Edinburgh, Scotland, UK ==

The meeting will be hosted by [https://www.denotational.co.uk/ Ohad Kammar], who will write in the first person in the remainder.

The meeting will last 3.5 days; the first three days (Tues-Thur) will
be full-day whereas the last day (Fri) will be a half-day session.

=== Venue ===

[https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.07 Althaus-Reid Room, 1.07] ([http://exhibition.div.ed.ac.uk/rooms-renamed-in-honour-of-two-inspirational-female-theologians/ named after the theologian Marcella Althaus-Reid])

New College 
School of Divinity 
The University of Edinburgh 
Central Campus 
1 Mound Place 
Edinburgh EH1 2LU

This is unfortunately '''not''' the School of Informatics, which is about 15 minutes walk south from this venue.

A [https://maps.app.goo.gl/oCXGNCb2ax68WS6B6/ Google map] with the venue, hotels, and meeting-relevant locations.

==== WiFi Access ====

* '''eduroam.''' If you have eduroam credentials, you may use them to access the eduroam network while at Edinburgh.

* '''guest account.''' If you know that eduroam will not work for you, I can set you up with a guest account. Please indicate that you will definitely need a guest account in your registration form. You can always let me know after registration whether you need one, including during the meeting. Guests must abide by the [https://vpnreg.ucs.ed.ac.uk/admin/compregs.pdf computing regulations].

* '''Visit-Ed.''' If eduroam does not work for you and you don't have a guest account, you can try using the [https://www.ed.ac.uk/information-services/computing/desktop-personal/wifi-networking/guest-alumni-wifi-access Visit-Ed service] described in the middle of that page. It requires registration by Facebook, LinkedIn, WhatsApp, or text message (international numbers included).

==== Workspace ====

A quiet area for shared use is available in the [https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.09 Porteous Room 1.09]
(you can read more about it
[https://exhibition.div.ed.ac.uk/porteous%E2%80%AFroom/ here]) on the
same floor as the main room.

== Travel ==

=== Travel to Edinburgh ===

==== Air ====

[https://www.edinburghairport.com/ Edinburgh Airport] is located
approximately 8 miles away from the city centre.

The [https://edinburghtrams.com/ Edinburgh tram] runs from the
airport every 7 minutes, the last tram from the airport leaves after
22:30 (see tram webpage).

The [https://airlink100.co.uk/ Airlink bus] (service 100) runs
between the airport and the city centre, reaching Waverley Bridge
railway station in 25 minutes. The route to and from the airport runs
24 hours a day every 10 minutes approximately during the day.

Most advance hire taxi companies will offer an airport pick-up
service. [https://www.taxis-edinburgh.co.uk/ Here's one], but any will
do. There's also a taxi hailing stand at the airport, follow the signs.

You can also fly into another main UK city and continue to Edinburgh by [[#Train|train]].

==== Train ====

Edinburgh is well-connected to most other main UK cities. There are a
few faster trains from London (about 4h25min) every day. You can use [https://www.nationalrail.co.uk/ National Rail] to plan your trip and link you to the appropriate provider.

I have enjoyed taking the Eurostar from the main continent to London. There is also the [https://www.sleeper.scot/ Caledonian Sleeper] that can get you to Edinburgh or London by 7am very slowly overnight.

=== Travel around Edinburgh ===

Edinburgh is somewhat hilly and the venue is located [https://upload.wikimedia.org/wikipedia/commons/f/ff/The_Mound%2C_Edinburgh%2C_18_September_2014.jpg up a slope].
If that is not a problem, then Edinburgh is quite walkable.

Public transportation is available. Check out [https://transportforedinburgh.com/ Transport for Edinburgh] for all the details.

* Buses. [https://www.lothianbuses.com/ Lothian buses] operates many of the relevant buses. You can pay contactless with a card or app and there's a capped pay program ('TapTapCap'). Here's the [https://www.lothianbuses.com/wp-content/uploads/2024/09/Network_Map_240908.pdf map], but I usually use Google maps for directions.

* Taxis. You can usually just hail a black cab from anywhere in the centre, see their [https://www.taxis-edinburgh.co.uk/ webpage] for advance bookings. Your favourite search engine will provide other taxi companies.

* Tram. The [https://edinburghtrams.com/ Edinburgh tram] stops fairly close to the venue, so can be an easy way to the venue.

* Uber operates in Edinburgh.

== Accommodation ==

The venue is located quite centrally, with many hotels nearby. Here are some 4-star and 3-star suggestions nearby, but you'll probably find something charming by your own (just watch out for scams). The tram and buses make it easy to also stay somewhere away from the centre and commute in if you prefer.

Hotel suggestions:
* [https://www.apexhotels.co.uk/destinations/edinburgh/apex-city-of-edinburgh-hotel/ Apex City of Edinburgh Hotel]. Main suggestion, slightly-up-and-steep-downhill from the venue. We have a 10% discount code, which I will email once I have it. '''Note:''' There is a slightly more full Apex hotel on the same street which I listed before, so if you want to be in the suggested hotel, make sure you're in the correct one.
* [https://www.motel-one.com/en/hotels/edinburgh/hotel-edinburgh-royal/ Motel One Edinburgh Royal]. A cheaper option, steep downhill from the venue.
* [https://www.scotsmanhotel.co.uk/ Scotsman Hotel]. A more expensive option, slightly-up-and-moderate-downhill from the venue.

== Weather ==

Edinburgh has temperate (and temperamental) climate, and currently the broadcast is 0 to 8 degrees centrigade during the day, and perhaps -1 degrees centrigade at night and in the early morning. It will be windy with gusts of wind of up to 35 mph, and potentially rainy, so make sure you dress appropriately. Locals wear waterproof/resistant clothes. Umbrellas tend to be rather useless due to the wind, one typically recognises the tourists by their futile struggles to turn inside-out umbrellas
while getting soaked.

The days are quite short in December, and you might be able to catch
the sunrise heading into the venue in the morning. I recommend
avoiding missing most of the daylight completely, e.g., make sure you go
for a short walk outside during the lunch break.

== Tourism ==

Edinburgh offers many tourist attractions and museums, and many are located centrally and close to the venue. Entrance to museums and galleries is free. Entrance to some exhibitions in the museum or gallery will require buying a separate ticket.

The meeting takes place just after [https://www.visitscotland.com/things-to-do/events/st-andrews-day Saint Andrew's Day] weekend, and Monday will be a public holiday in Scotland.
That should not affect travel, although the airport and railway might be busier than usual.

[https://www.historicenvironment.scot/about-us/news/st-andrews-day-ticket-giveaway/ Historic Environment Scotland] offer free tickets to visit some Historic Scotland attractions on Saint Andrew's day, such as the Edinburgh Castle. Registration for [https://www.historicenvironment.scot/ticket-giveaway/ free tourism tickets] opens Tuesday 12 November 10am UK time until Thursday 28 November.

If you go to the Castle, try to get there before 1pm to see them fire the Cannon.

Very near the venue is Scott Monument which you can climb, for a fee,
during the day for a stunning view. There will be a German Christmas
Market nearby I believe.

There are several hills within the city and you can easily climb up. The easiest (and closest to the venue) is [https://ewh.org.uk/calton-hill/ Calton Hill] and has a road and steps leading all the way up.

[https://www.geolsoc.org.uk/GeositesArthursSeat Arthur's Seat and the Salisbury Crags] are most visible from the centre. It takes about 1.5 hours roundtrip to get to the top. The grass can be slippery after a rain, and people can slip to their death, so wear good shoes and only climb during the day.

You can sometimes take a daytrip on a guided tour to the highlands or a whisky distillery. If you have the time, I recommend spending a few days in the former, and maybe visiting some of the latter.

I'll try to add more stuff here, especially if people send me recommendations or ask questions.

== Registration ==
Please register [https://www.epay.ed.ac.uk/conferences-and-events/college-of-science-and-engineering/school-of-informatics/informatics-events/ifip-working-group here].
After you 'Book Event', please choose either:
* '4 Day Attendee' or
* iff you're only attending partially, tick the boxes for the relevant days.

(If you plan to partially attend, please discuss with the Chairs first. I think it's somewhat unusual.)

You'll be prompted for additional details like contact details, allergies and dietary requirements after: adding to basket; proceeding to checkout; registering.

Please let me know if you have any problems. Please let me know if you won't be able to register before Thursday 28 Nov.

== Attendance ==
(Alphabetical by last name please)

* Guillaume Allais
* Nada Amin
* Sandrine Blazy
* Edwin Brady
* Jacques Carette
* Sebastian Erdweg
* Jeremy Gibbons
* Kevin Hammond
* Ohad Kammar
* Paul Kelly (on 5-6 only)
* Andras Kovacs
* Lindsey Kuper
* Julia Lawall
* Ralf Lämmel
* Sam Lindley
* James McKinna
* Peter Mosses
* Christoph Reichenbach
* Tiark Rompf
* Sven-Bodo Scholz
* Amir Shaikhha
* Friedrich Steimann
* Jeremy Yallop

=== Local Observers ===
* Greg Brown
* Justus Matthiesen
* Nachiappan Valliappan
* Robert Wright

== Talks ==

See below for the schedule (but note that the actual scheduling of talks will not be available until the meeting starts). Members: please add yourself and your topic, alphabetically ordered by surname:
| Scoped and Typed Staging by Evaluation
* Guillaume Allais [[WG211/M24Allais | Scoped and Typed Staging by Evaluation ]]
* Nada Amin [[WG211/M24Amin | Experiments in verified program synthesis with LLMs ]]
* Sandrine Blazy [[WG211/M24Blazy | A Mechanized Semantics for Dataflow Circuits ]]
* Edwin Brady [[WG211/M24Brady | "Normalisation by Compilation": Typechecking Dependent Types via the Scheme Runtime ]]
* Jacques Carette [[WG211/M24Carette | Partial Evaluation from Equational Theories ]]
* Sebastian Erdweg [[WG211/M24Erdweg | Stateful Differential Operators for Incremental Computing ]]
* Jeremy Gibbons [[WG211/M24Gibbons | Continuation−Passing Style‚ Defunctionalization‚ Accumulations‚ and Associativity ]]
* Kevin Hammond [[WG211/M24Hammond | Using Formal Methods at Scale in the Delivery of a High Assurance Distributed System: the Cardano Blockchain Implementation in Haskell ]]
* Andras Kovacs [[WG211/M24Kovacs | Runtime code generation with dependent types ]]
* Lindsey Kuper [[WG211/M24Kuper | Library-Level Choreographic Programming ]]
* Ralf Lämmel [[WG211/M24Laemmel | Type Inference in a Knowledge-Graph Setting]]
* Sam Lindley [[ WG211M24Lindley | Modal Effect Types ]]
* Peter Mosses [[ WG211/M24Mosses | Denotational Semantics in Agda ]]
* Christoph Reichenbach [[ WG211/M23Reichenbach | Circular Attribute Evaluation in Reference Attribute Grammars ]]
* Tiark Rompf [[WG211/M24Rompf | Rhyme: A Data-Centric Multi-Paradigm Query Language ]]
* Amir Shaikhha [[ WG211M24Shaikhha | Democratizing Data Science by Leveraging Structure ]]
* Sven-Bodo Scholz [[WG211/M24Scholz| Hybrid Typing --- unleashing the battle between good error messages and aggressive program optimisation ]]
* Friedrich Steimann [[ WG211/M24Steimann | A really old new metatheory of software languages ]]

We will follow our usual format of interactive talks with an active audience, using a chess clock for timing, as follows. For each talk the speaker and the audience each get at most 25 minutes. The audience does not have to wait until the end of a talk to ask questions; interaction and discussion is encouraged. (But experience from previous meetings shows that it is useful to let the speaker at least finish the introduction before interrupting.) To ensure fairness, administration of the time used by each party is done using a chess clock. Operation of the clock rotates among participants. Both speaker and audience are expected to contribute to make talks and discussions engaging, interesting, and useful. Therefore, we observe a policy of no use of electronic devices during talks (other than the device the speaker uses to present slides). Bring paper and pen for making notes.

== Program / schedule ==

=== Scientific program ===

Updated nightly for the following day.

Tuesday, December 3

* 09:00 - 09:15 Assemble and welcome
** 09:15 - 10:00 Rompf
** 10:00 - 10:45 Steimann
* 10:45 - 11:15 Coffee break
** 11:15 - 12:00 Mosses
* 12:00 - 14:00 Lunch and break
** 14:00 - 14:45 Kuper
** 14:45 - 15:30 Amin
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 Allais

* 19:00 Dinner: David Bann

Wednesday, December 4

Note: if you're planning to walk to the Galleries today, bring comfortable shoes and relatively warm clothes.

* 09:00 - 09:15 Assemble and welcome
** 09:15 - 10:00 Lindley
** 10:00 - 10:45 Brady
* 10:45 - 11:15 Coffee break
** 11:15 - 12:00 Shaikhha
* 12:00 - 12:55 Lunch and short break
* 12:55 onwards: afternoon excursion to the Modern Art Galleries

* 19:00 Dinner: Wee Greek Kitchen

Thursday, December 5

* 08:45 - 09:05 Assemble and welcome
** 09:05 - 09:50 Kovacs
** 09:50 - 10:35 Blazy
* 10:35 - 11:00 Coffee break
** 11:00 - 11:45 Carette
** 11:45 - 12:30 Erdweg
* 12:30 - 14:15 Lunch and break
** 14:15 - 15:00 McKinna
** 15:00 - 15:45 Gibbons
* 15:45 - 17:00 Coffee break transitioning into business meeting
* 20:30 Dinner: Howie's at Waterloo Place

Friday, December 6

* 08:45 - 09:05 Assemble and welcome
** 09:05 - 09:50 Hammond
** 09:50 - 10:35 Scholz
* 10:35 - 11:00 Coffee break
** 11:00 - 11:45 Reichenbach
** 11:45 - 12:30 Laemel
* 12:30 - 14:15 Lunch and farewell

=== Social events ===

==== Dinners ====
* Tuesday, 19:00 December 3: [https://www.davidbann.co.uk/ David Bann] ([https://maps.app.goo.gl/6PevFCJjTn1LfbTt5 map])
* Wednesday, 19:00 December 4: [https://weegreekkitchen.co.uk/ Wee Greek Kitchen] ([https://maps.app.goo.gl/HBJab37BAV8PSQbS9 map])
* Thursday, 20:30 December 5: [https://www.howies.uk.com/venues/howies-waterloo-place/ Howie's at Waterloo Place] ([https://maps.app.goo.gl/RwfdtvHfNaRXaZYD6 map], make sure you go to the one at Waterloo Place!)

==== Excursion ====

On Wednesday afternoon, we'll ramble to the [https://www.nationalgalleries.org/visit/scottish-national-gallery-modern-art Modern Art Galleries] [https://maps.app.goo.gl/md1ZDd1XiCBuwBpS6 One] and [https://maps.app.goo.gl/fV8oSdeHQazrL2J2A Two].

Directions:
* 12:55 Arrive independently by '''Bus:''' take the [https://maps.app.goo.gl/nFEdHat3yddNQUxZ9 13 bus from Princes Street stop PU] . See [[ WG211/M24Schedule#Travel_around_Edinburgh | Travel around Edinburgh ]] section on paying your way.
* 13:00 '''Scenic route''' walk (around 1h, dress warmly), details below.

Synchronised activities:
* 13:00 '''Scenic route''': Meet outside New College for the scenic route walk. [https://maps.app.goo.gl/NNq6dFWMTRn64oqN7 Planned route]:
** Princes Street Gardens
** Queensferry Road and Dean Village
** [https://en.wikipedia.org/wiki/Water_of_Leith_Walkway Water of Leith Walkway]
** [https://www.aidsmemorial.info/memorial/id=98/life_tribute_edinburgh_aids_memorial.html Life Tribute]

* 15:00-16:15. Guided tour of [https://maps.app.goo.gl/fV8oSdeHQazrL2J2A Modern Art Gallery Two], meet Katharine and Duncan outside.

* 16:57 [https://maps.app.goo.gl/jXtfbjfkFGjhRCBd7 Bus back to Princes Street]. See [[ WG211/M24Schedule#Travel_around_Edinburgh| Travel around Edinburgh ]] section on paying your way.
* 17:00 Galleries close.

'''Warning:''' Walking from the Galleries to the Wee Greek Kitchen will be around 1h, in the dark and cold. If you choose to walk, I recommend you stop somewhere along the way to get warm again, maybe drink a cup of tea or mulled wine. Here's a route with the [https://maps.app.goo.gl/Uitqc7dCrY6eyvuj6 last possible option to do so], but feel free to duck into any nice place along the way.

==== Thursday pre-dinner activities ====

Especially if you're not attending the business meeting, there is plenty of time to spend between sunset and dinner. A nice activity can be to stroll around the [https://www.visitscotland.com/things-to-do/events/christmas-winter-festivals/edinburgh Edinburgh Chrismas Market]. It's [https://maps.app.goo.gl/MehaaffXdeehk6NMA hard to miss], and straight down from the venue, with Howie's at Waterloo Place just up the road.

WG211/M24Schedule

2024-12-04T11:16:09Z

Jacques: /* Program / schedule */

= IFIP Working Group 2.11, Twenty-fourth Meeting =

== December 3rd (Tues) - 6th (Fri) in Edinburgh, Scotland, UK ==

The meeting will be hosted by [https://www.denotational.co.uk/ Ohad Kammar], who will write in the first person in the remainder.

The meeting will last 3.5 days; the first three days (Tues-Thur) will
be full-day whereas the last day (Fri) will be a half-day session.

=== Venue ===

[https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.07 Althaus-Reid Room, 1.07] ([http://exhibition.div.ed.ac.uk/rooms-renamed-in-honour-of-two-inspirational-female-theologians/ named after the theologian Marcella Althaus-Reid])

New College 
School of Divinity 
The University of Edinburgh 
Central Campus 
1 Mound Place 
Edinburgh EH1 2LU

This is unfortunately '''not''' the School of Informatics, which is about 15 minutes walk south from this venue.

A [https://maps.app.goo.gl/oCXGNCb2ax68WS6B6/ Google map] with the venue, hotels, and meeting-relevant locations.

==== WiFi Access ====

* '''eduroam.''' If you have eduroam credentials, you may use them to access the eduroam network while at Edinburgh.

* '''guest account.''' If you know that eduroam will not work for you, I can set you up with a guest account. Please indicate that you will definitely need a guest account in your registration form. You can always let me know after registration whether you need one, including during the meeting. Guests must abide by the [https://vpnreg.ucs.ed.ac.uk/admin/compregs.pdf computing regulations].

* '''Visit-Ed.''' If eduroam does not work for you and you don't have a guest account, you can try using the [https://www.ed.ac.uk/information-services/computing/desktop-personal/wifi-networking/guest-alumni-wifi-access Visit-Ed service] described in the middle of that page. It requires registration by Facebook, LinkedIn, WhatsApp, or text message (international numbers included).

==== Workspace ====

A quiet area for shared use is available in the [https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.09 Porteous Room 1.09]
(you can read more about it
[https://exhibition.div.ed.ac.uk/porteous%E2%80%AFroom/ here]) on the
same floor as the main room.

== Travel ==

=== Travel to Edinburgh ===

==== Air ====

[https://www.edinburghairport.com/ Edinburgh Airport] is located
approximately 8 miles away from the city centre.

The [https://edinburghtrams.com/ Edinburgh tram] runs from the
airport every 7 minutes, the last tram from the airport leaves after
22:30 (see tram webpage).

The [https://airlink100.co.uk/ Airlink bus] (service 100) runs
between the airport and the city centre, reaching Waverley Bridge
railway station in 25 minutes. The route to and from the airport runs
24 hours a day every 10 minutes approximately during the day.

Most advance hire taxi companies will offer an airport pick-up
service. [https://www.taxis-edinburgh.co.uk/ Here's one], but any will
do. There's also a taxi hailing stand at the airport, follow the signs.

You can also fly into another main UK city and continue to Edinburgh by [[#Train|train]].

==== Train ====

Edinburgh is well-connected to most other main UK cities. There are a
few faster trains from London (about 4h25min) every day. You can use [https://www.nationalrail.co.uk/ National Rail] to plan your trip and link you to the appropriate provider.

I have enjoyed taking the Eurostar from the main continent to London. There is also the [https://www.sleeper.scot/ Caledonian Sleeper] that can get you to Edinburgh or London by 7am very slowly overnight.

=== Travel around Edinburgh ===

Edinburgh is somewhat hilly and the venue is located [https://upload.wikimedia.org/wikipedia/commons/f/ff/The_Mound%2C_Edinburgh%2C_18_September_2014.jpg up a slope].
If that is not a problem, then Edinburgh is quite walkable.

Public transportation is available. Check out [https://transportforedinburgh.com/ Transport for Edinburgh] for all the details.

* Buses. [https://www.lothianbuses.com/ Lothian buses] operates many of the relevant buses. You can pay contactless with a card or app and there's a capped pay program ('TapTapCap'). Here's the [https://www.lothianbuses.com/wp-content/uploads/2024/09/Network_Map_240908.pdf map], but I usually use Google maps for directions.

* Taxis. You can usually just hail a black cab from anywhere in the centre, see their [https://www.taxis-edinburgh.co.uk/ webpage] for advance bookings. Your favourite search engine will provide other taxi companies.

* Tram. The [https://edinburghtrams.com/ Edinburgh tram] stops fairly close to the venue, so can be an easy way to the venue.

* Uber operates in Edinburgh.

== Accommodation ==

The venue is located quite centrally, with many hotels nearby. Here are some 4-star and 3-star suggestions nearby, but you'll probably find something charming by your own (just watch out for scams). The tram and buses make it easy to also stay somewhere away from the centre and commute in if you prefer.

Hotel suggestions:
* [https://www.apexhotels.co.uk/destinations/edinburgh/apex-city-of-edinburgh-hotel/ Apex City of Edinburgh Hotel]. Main suggestion, slightly-up-and-steep-downhill from the venue. We have a 10% discount code, which I will email once I have it. '''Note:''' There is a slightly more full Apex hotel on the same street which I listed before, so if you want to be in the suggested hotel, make sure you're in the correct one.
* [https://www.motel-one.com/en/hotels/edinburgh/hotel-edinburgh-royal/ Motel One Edinburgh Royal]. A cheaper option, steep downhill from the venue.
* [https://www.scotsmanhotel.co.uk/ Scotsman Hotel]. A more expensive option, slightly-up-and-moderate-downhill from the venue.

== Weather ==

Edinburgh has temperate (and temperamental) climate, and currently the broadcast is 0 to 8 degrees centrigade during the day, and perhaps -1 degrees centrigade at night and in the early morning. It will be windy with gusts of wind of up to 35 mph, and potentially rainy, so make sure you dress appropriately. Locals wear waterproof/resistant clothes. Umbrellas tend to be rather useless due to the wind, one typically recognises the tourists by their futile struggles to turn inside-out umbrellas
while getting soaked.

The days are quite short in December, and you might be able to catch
the sunrise heading into the venue in the morning. I recommend
avoiding missing most of the daylight completely, e.g., make sure you go
for a short walk outside during the lunch break.

== Tourism ==

Edinburgh offers many tourist attractions and museums, and many are located centrally and close to the venue. Entrance to museums and galleries is free. Entrance to some exhibitions in the museum or gallery will require buying a separate ticket.

The meeting takes place just after [https://www.visitscotland.com/things-to-do/events/st-andrews-day Saint Andrew's Day] weekend, and Monday will be a public holiday in Scotland.
That should not affect travel, although the airport and railway might be busier than usual.

[https://www.historicenvironment.scot/about-us/news/st-andrews-day-ticket-giveaway/ Historic Environment Scotland] offer free tickets to visit some Historic Scotland attractions on Saint Andrew's day, such as the Edinburgh Castle. Registration for [https://www.historicenvironment.scot/ticket-giveaway/ free tourism tickets] opens Tuesday 12 November 10am UK time until Thursday 28 November.

If you go to the Castle, try to get there before 1pm to see them fire the Cannon.

Very near the venue is Scott Monument which you can climb, for a fee,
during the day for a stunning view. There will be a German Christmas
Market nearby I believe.

There are several hills within the city and you can easily climb up. The easiest (and closest to the venue) is [https://ewh.org.uk/calton-hill/ Calton Hill] and has a road and steps leading all the way up.

[https://www.geolsoc.org.uk/GeositesArthursSeat Arthur's Seat and the Salisbury Crags] are most visible from the centre. It takes about 1.5 hours roundtrip to get to the top. The grass can be slippery after a rain, and people can slip to their death, so wear good shoes and only climb during the day.

You can sometimes take a daytrip on a guided tour to the highlands or a whisky distillery. If you have the time, I recommend spending a few days in the former, and maybe visiting some of the latter.

I'll try to add more stuff here, especially if people send me recommendations or ask questions.

== Registration ==
Please register [https://www.epay.ed.ac.uk/conferences-and-events/college-of-science-and-engineering/school-of-informatics/informatics-events/ifip-working-group here].
After you 'Book Event', please choose either:
* '4 Day Attendee' or
* iff you're only attending partially, tick the boxes for the relevant days.

(If you plan to partially attend, please discuss with the Chairs first. I think it's somewhat unusual.)

You'll be prompted for additional details like contact details, allergies and dietary requirements after: adding to basket; proceeding to checkout; registering.

Please let me know if you have any problems. Please let me know if you won't be able to register before Thursday 28 Nov.

== Attendance ==
(Alphabetical by last name please)

* Guillaume Allais
* Nada Amin
* Sandrine Blazy
* Edwin Brady
* Jacques Carette
* Sebastian Erdweg
* Jeremy Gibbons
* Kevin Hammond
* Ohad Kammar
* Paul Kelly (on 5-6 only)
* Andras Kovacs
* Lindsey Kuper
* Julia Lawall
* Ralf Lämmel
* Sam Lindley
* James McKinna
* Peter Mosses
* Christoph Reichenbach
* Tiark Rompf
* Sven-Bodo Scholz
* Amir Shaikhha
* Friedrich Steimann
* Jeremy Yallop

=== Local Observers ===
* Greg Brown
* Justus Matthiesen
* Nachiappan Valliappan
* Robert Wright

== Talks ==

See below for the schedule (but note that the actual scheduling of talks will not be available until the meeting starts). Members: please add yourself and your topic, alphabetically ordered by surname:
| Scoped and Typed Staging by Evaluation
* Guillaume Allais [[WG211/M24Allais | Scoped and Typed Staging by Evaluation ]]
* Nada Amin [[WG211/M24Amin | Experiments in verified program synthesis with LLMs ]]
* Sandrine Blazy [[WG211/M24Blazy | A Mechanized Semantics for Dataflow Circuits ]]
* Edwin Brady [[WG211/M24Brady | "Normalisation by Compilation": Typechecking Dependent Types via the Scheme Runtime ]]
* Jacques Carette [[WG211/M24Carette | Partial Evaluation from Equational Theories ]]
* Sebastian Erdweg [[WG211/M24Erdweg | Stateful Differential Operators for Incremental Computing ]]
* Jeremy Gibbons [[WG211/M24Gibbons | Continuation−Passing Style‚ Defunctionalization‚ Accumulations‚ and Associativity ]]
* Kevin Hammond [[WG211/M24Hammond | Using Formal Methods at Scale in the Delivery of a High Assurance Distributed System: the Cardano Blockchain Implementation in Haskell ]]
* Andras Kovacs [[WG211/M24Kovacs | Runtime code generation with dependent types ]]
* Lindsey Kuper [[WG211/M24Kuper | Library-Level Choreographic Programming ]]
* Ralf Lämmel [[WG211/M24Laemmel | Type Inference in a Knowledge-Graph Setting]]
* Sam Lindley [[ WG211M24Lindley | Modal Effect Types ]]
* Peter Mosses [[ WG211/M24Mosses | Denotational Semantics in Agda ]]
* Christoph Reichenbach [[ WG211/M23Reichenbach | Circular Attribute Evaluation in Reference Attribute Grammars ]]
* Tiark Rompf [[WG211/M24Rompf | Rhyme: A Data-Centric Multi-Paradigm Query Language ]]
* Amir Shaikhha [[ WG211M24Shaikhha | Democratizing Data Science by Leveraging Structure ]]
* Sven-Bodo Scholz [[WG211/M24Scholz| Hybrid Typing --- unleashing the battle between good error messages and aggressive program optimisation ]]
* Friedrich Steimann [[ WG211/M24Steimann | A really old new metatheory of software languages ]]

We will follow our usual format of interactive talks with an active audience, using a chess clock for timing, as follows. For each talk the speaker and the audience each get at most 25 minutes. The audience does not have to wait until the end of a talk to ask questions; interaction and discussion is encouraged. (But experience from previous meetings shows that it is useful to let the speaker at least finish the introduction before interrupting.) To ensure fairness, administration of the time used by each party is done using a chess clock. Operation of the clock rotates among participants. Both speaker and audience are expected to contribute to make talks and discussions engaging, interesting, and useful. Therefore, we observe a policy of no use of electronic devices during talks (other than the device the speaker uses to present slides). Bring paper and pen for making notes.

== Program / schedule ==

=== Scientific program ===

Updated nightly for the following day.

Tuesday, December 3

* 09:00 - 09:15 Assemble and welcome
** 09:15 - 10:00 Rompf
** 10:00 - 10:45 Steimann
* 10:45 - 11:15 Coffee break
** 11:15 - 12:00 Mosses
* 12:00 - 14:00 Lunch and break
** 14:00 - 14:45 Kuper
** 14:45 - 15:30 Amin
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 Allais

* 19:00 Dinner: David Bann

Wednesday, December 4

Note: if you're planning to walk to the Galleries today, bring comfortable shoes and relatively warm clothes.

* 09:00 - 09:15 Assemble and welcome
** 09:15 - 10:00 Lindley
** 10:00 - 10:45 Brady
* 10:45 - 11:15 Coffee break
** 11:15 - 12:00 Shaikhha
* 12:00 - 12:55 Lunch and short break
* 12:55 onwards: afternoon excursion to the Modern Art Galleries

* 19:00 Dinner: Wee Greek Kitchen

Thursday, December 5

* 08:45 - 09:05 Assemble and welcome
** 09:05 - 09:50 Talk 10
** 09:50 - 10:35 Talk 11
* 10:35 - 11:00 Coffee break
** 11:00 - 11:45 Talk 12
** 11:45 - 12:30 Talk 13
* 12:30 - 14:15 Lunch and break
** 14:15 - 15:00 Talk 14
** 15:00 - 15:45 Talk 15
* 15:45 - 17:00 Coffee break transitioning into business meeting
* 20:30 Dinner: Howie's at Waterloo Place

Friday, December 6

* 08:45 - 09:05 Assemble and welcome
** 09:05 - 09:50 Talk 16
** 09:50 - 10:35 Talk 17
* 10:35 - 11:00 Coffee break
** 11:00 - 11:45 Talk 18
** 11:45 - 12:30 Talk 19
* 12:30 - 14:15 Lunch and farewell

=== Social events ===

==== Dinners ====
* Tuesday, 19:00 December 3: [https://www.davidbann.co.uk/ David Bann] ([https://maps.app.goo.gl/6PevFCJjTn1LfbTt5 map])
* Wednesday, 19:00 December 4: [https://weegreekkitchen.co.uk/ Wee Greek Kitchen] ([https://maps.app.goo.gl/HBJab37BAV8PSQbS9 map])
* Thursday, 20:30 December 5: [https://www.howies.uk.com/venues/howies-waterloo-place/ Howie's at Waterloo Place] ([https://maps.app.goo.gl/RwfdtvHfNaRXaZYD6 map], make sure you go to the one at Waterloo Place!)

==== Excursion ====

On Wednesday afternoon, we'll ramble to the [https://www.nationalgalleries.org/visit/scottish-national-gallery-modern-art Modern Art Galleries] [https://maps.app.goo.gl/md1ZDd1XiCBuwBpS6 One] and [https://maps.app.goo.gl/fV8oSdeHQazrL2J2A Two].

Directions:
* 12:55 Arrive independently by '''Bus:''' take the [https://maps.app.goo.gl/nFEdHat3yddNQUxZ9 13 bus from Princes Street stop PU] . See [[ WG211/M24Schedule#Travel_around_Edinburgh | Travel around Edinburgh ]] section on paying your way.
* 13:00 '''Scenic route''' walk (around 1h, dress warmly), details below.

Synchronised activities:
* 13:00 '''Scenic route''': Meet outside New College for the scenic route walk. [https://maps.app.goo.gl/NNq6dFWMTRn64oqN7 Planned route]:
** Princes Street Gardens
** Queensferry Road and Dean Village
** [https://en.wikipedia.org/wiki/Water_of_Leith_Walkway Water of Leith Walkway]
** [https://www.aidsmemorial.info/memorial/id=98/life_tribute_edinburgh_aids_memorial.html Life Tribute]

* 15:00-16:15. Guided tour of [https://maps.app.goo.gl/fV8oSdeHQazrL2J2A Modern Art Gallery Two], meet Katharine and Duncan outside.

* 16:57 [https://maps.app.goo.gl/jXtfbjfkFGjhRCBd7 Bus back to Princes Street]. See [[ WG211/M24Schedule#Travel_around_Edinburgh| Travel around Edinburgh ]] section on paying your way.
* 17:00 Galleries close.

'''Warning:''' Walking from the Galleries to the Wee Greek Kitchen will be around 1h, in the dark and cold. If you choose to walk, I recommend you stop somewhere along the way to get warm again, maybe drink a cup of tea or mulled wine. Here's a route with the [https://maps.app.goo.gl/Uitqc7dCrY6eyvuj6 last possible option to do so], but feel free to duck into any nice place along the way.

==== Thursday pre-dinner activities ====

Especially if you're not attending the business meeting, there is plenty of time to spend between sunset and dinner. A nice activity can be to stroll around the [https://www.visitscotland.com/things-to-do/events/christmas-winter-festivals/edinburgh Edinburgh Chrismas Market]. It's [https://maps.app.goo.gl/MehaaffXdeehk6NMA hard to miss], and straight down from the venue, with Howie's at Waterloo Place just up the road.

WG211/M24Schedule

2024-12-04T09:14:05Z

Jacques: /* Scientific program */

= IFIP Working Group 2.11, Twenty-fourth Meeting =

== December 3rd (Tues) - 6th (Fri) in Edinburgh, Scotland, UK ==

The meeting will be hosted by [https://www.denotational.co.uk/ Ohad Kammar], who will write in the first person in the remainder.

The meeting will last 3.5 days; the first three days (Tues-Thur) will
be full-day whereas the last day (Fri) will be a half-day session.

=== Venue ===

[https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.07 Althaus-Reid Room, 1.07] ([http://exhibition.div.ed.ac.uk/rooms-renamed-in-honour-of-two-inspirational-female-theologians/ named after the theologian Marcella Althaus-Reid])

New College 
School of Divinity 
The University of Edinburgh 
Central Campus 
1 Mound Place 
Edinburgh EH1 2LU

This is unfortunately '''not''' the School of Informatics, which is about 15 minutes walk south from this venue.

A [https://maps.app.goo.gl/oCXGNCb2ax68WS6B6/ Google map] with the venue, hotels, and meeting-relevant locations.

==== WiFi Access ====

* '''eduroam.''' If you have eduroam credentials, you may use them to access the eduroam network while at Edinburgh.

* '''guest account.''' If you know that eduroam will not work for you, I can set you up with a guest account. Please indicate that you will definitely need a guest account in your registration form. You can always let me know after registration whether you need one, including during the meeting. Guests must abide by the [https://vpnreg.ucs.ed.ac.uk/admin/compregs.pdf computing regulations].

* '''Visit-Ed.''' If eduroam does not work for you and you don't have a guest account, you can try using the [https://www.ed.ac.uk/information-services/computing/desktop-personal/wifi-networking/guest-alumni-wifi-access Visit-Ed service] described in the middle of that page. It requires registration by Facebook, LinkedIn, WhatsApp, or text message (international numbers included).

==== Workspace ====

A quiet area for shared use is available in the [https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.09 Porteous Room 1.09]
(you can read more about it
[https://exhibition.div.ed.ac.uk/porteous%E2%80%AFroom/ here]) on the
same floor as the main room.

== Travel ==

=== Travel to Edinburgh ===

==== Air ====

[https://www.edinburghairport.com/ Edinburgh Airport] is located
approximately 8 miles away from the city centre.

The [https://edinburghtrams.com/ Edinburgh tram] runs from the
airport every 7 minutes, the last tram from the airport leaves after
22:30 (see tram webpage).

The [https://airlink100.co.uk/ Airlink bus] (service 100) runs
between the airport and the city centre, reaching Waverley Bridge
railway station in 25 minutes. The route to and from the airport runs
24 hours a day every 10 minutes approximately during the day.

Most advance hire taxi companies will offer an airport pick-up
service. [https://www.taxis-edinburgh.co.uk/ Here's one], but any will
do. There's also a taxi hailing stand at the airport, follow the signs.

You can also fly into another main UK city and continue to Edinburgh by [[#Train|train]].

==== Train ====

Edinburgh is well-connected to most other main UK cities. There are a
few faster trains from London (about 4h25min) every day. You can use [https://www.nationalrail.co.uk/ National Rail] to plan your trip and link you to the appropriate provider.

I have enjoyed taking the Eurostar from the main continent to London. There is also the [https://www.sleeper.scot/ Caledonian Sleeper] that can get you to Edinburgh or London by 7am very slowly overnight.

=== Travel around Edinburgh ===

Edinburgh is somewhat hilly and the venue is located [https://upload.wikimedia.org/wikipedia/commons/f/ff/The_Mound%2C_Edinburgh%2C_18_September_2014.jpg up a slope].
If that is not a problem, then Edinburgh is quite walkable.

Public transportation is available. Check out [https://transportforedinburgh.com/ Transport for Edinburgh] for all the details.

* Buses. [https://www.lothianbuses.com/ Lothian buses] operates many of the relevant buses. You can pay contactless with a card or app and there's a capped pay program ('TapTapCap'). Here's the [https://www.lothianbuses.com/wp-content/uploads/2024/09/Network_Map_240908.pdf map], but I usually use Google maps for directions.

* Taxis. You can usually just hail a black cab from anywhere in the centre, see their [https://www.taxis-edinburgh.co.uk/ webpage] for advance bookings. Your favourite search engine will provide other taxi companies.

* Tram. The [https://edinburghtrams.com/ Edinburgh tram] stops fairly close to the venue, so can be an easy way to the venue.

* Uber operates in Edinburgh.

== Accommodation ==

The venue is located quite centrally, with many hotels nearby. Here are some 4-star and 3-star suggestions nearby, but you'll probably find something charming by your own (just watch out for scams). The tram and buses make it easy to also stay somewhere away from the centre and commute in if you prefer.

Hotel suggestions:
* [https://www.apexhotels.co.uk/destinations/edinburgh/apex-city-of-edinburgh-hotel/ Apex City of Edinburgh Hotel]. Main suggestion, slightly-up-and-steep-downhill from the venue. We have a 10% discount code, which I will email once I have it. '''Note:''' There is a slightly more full Apex hotel on the same street which I listed before, so if you want to be in the suggested hotel, make sure you're in the correct one.
* [https://www.motel-one.com/en/hotels/edinburgh/hotel-edinburgh-royal/ Motel One Edinburgh Royal]. A cheaper option, steep downhill from the venue.
* [https://www.scotsmanhotel.co.uk/ Scotsman Hotel]. A more expensive option, slightly-up-and-moderate-downhill from the venue.

== Weather ==

Edinburgh has temperate (and temperamental) climate, and currently the broadcast is 0 to 8 degrees centrigade during the day, and perhaps -1 degrees centrigade at night and in the early morning. It will be windy with gusts of wind of up to 35 mph, and potentially rainy, so make sure you dress appropriately. Locals wear waterproof/resistant clothes. Umbrellas tend to be rather useless due to the wind, one typically recognises the tourists by their futile struggles to turn inside-out umbrellas
while getting soaked.

The days are quite short in December, and you might be able to catch
the sunrise heading into the venue in the morning. I recommend
avoiding missing most of the daylight completely, e.g., make sure you go
for a short walk outside during the lunch break.

== Tourism ==

Edinburgh offers many tourist attractions and museums, and many are located centrally and close to the venue. Entrance to museums and galleries is free. Entrance to some exhibitions in the museum or gallery will require buying a separate ticket.

The meeting takes place just after [https://www.visitscotland.com/things-to-do/events/st-andrews-day Saint Andrew's Day] weekend, and Monday will be a public holiday in Scotland.
That should not affect travel, although the airport and railway might be busier than usual.

[https://www.historicenvironment.scot/about-us/news/st-andrews-day-ticket-giveaway/ Historic Environment Scotland] offer free tickets to visit some Historic Scotland attractions on Saint Andrew's day, such as the Edinburgh Castle. Registration for [https://www.historicenvironment.scot/ticket-giveaway/ free tourism tickets] opens Tuesday 12 November 10am UK time until Thursday 28 November.

If you go to the Castle, try to get there before 1pm to see them fire the Cannon.

Very near the venue is Scott Monument which you can climb, for a fee,
during the day for a stunning view. There will be a German Christmas
Market nearby I believe.

There are several hills within the city and you can easily climb up. The easiest (and closest to the venue) is [https://ewh.org.uk/calton-hill/ Calton Hill] and has a road and steps leading all the way up.

[https://www.geolsoc.org.uk/GeositesArthursSeat Arthur's Seat and the Salisbury Crags] are most visible from the centre. It takes about 1.5 hours roundtrip to get to the top. The grass can be slippery after a rain, and people can slip to their death, so wear good shoes and only climb during the day.

You can sometimes take a daytrip on a guided tour to the highlands or a whisky distillery. If you have the time, I recommend spending a few days in the former, and maybe visiting some of the latter.

I'll try to add more stuff here, especially if people send me recommendations or ask questions.

== Registration ==
Please register [https://www.epay.ed.ac.uk/conferences-and-events/college-of-science-and-engineering/school-of-informatics/informatics-events/ifip-working-group here].
After you 'Book Event', please choose either:
* '4 Day Attendee' or
* iff you're only attending partially, tick the boxes for the relevant days.

(If you plan to partially attend, please discuss with the Chairs first. I think it's somewhat unusual.)

You'll be prompted for additional details like contact details, allergies and dietary requirements after: adding to basket; proceeding to checkout; registering.

Please let me know if you have any problems. Please let me know if you won't be able to register before Thursday 28 Nov.

== Attendance ==
(Alphabetical by last name please)

* Guillaume Allais
* Nada Amin
* Sandrine Blazy
* Edwin Brady
* Jacques Carette
* Sebastian Erdweg
* Jeremy Gibbons
* Kevin Hammond
* Ohad Kammar
* Paul Kelly (on 5-6 only)
* Andras Kovacs
* Lindsey Kuper
* Julia Lawall
* Ralf Lämmel
* Sam Lindley
* James McKinna
* Peter Mosses
* Christoph Reichenbach
* Tiark Rompf
* Sven-Bodo Scholz
* Amir Shaikhha
* Friedrich Steimann
* Jeremy Yallop

=== Local Observers ===
* Greg Brown
* Justus Matthiesen
* Nachiappan Valliappan
* Robert Wright

== Talks ==

See below for the schedule (but note that the actual scheduling of talks will not be available until the meeting starts). Members: please add yourself and your topic, alphabetically ordered by surname:
| Scoped and Typed Staging by Evaluation
* Guillaume Allais [[WG211/M24Allais | Scoped and Typed Staging by Evaluation ]]
* Nada Amin [[WG211/M24Amin | Experiments in verified program synthesis with LLMs ]]
* Sandrine Blazy [[WG211/M24Blazy | A Mechanized Semantics for Dataflow Circuits ]]
* Edwin Brady [[WG211/M24Brady | "Normalisation by Compilation": Typechecking Dependent Types via the Scheme Runtime ]]
* Jacques Carette [[WG211/M24Carette | Partial Evaluation from Equational Theories ]]
* Sebastian Erdweg [[WG211/M24Erdweg | Stateful Differential Operators for Incremental Computing ]]
* Jeremy Gibbons [[WG211/M24Gibbons | Continuation−Passing Style‚ Defunctionalization‚ Accumulations‚ and Associativity ]]
* Kevin Hammond [[WG211/M24Hammond | Using Formal Methods at Scale in the Delivery of a High Assurance Distributed System: the Cardano Blockchain Implementation in Haskell ]]
* Andras Kovacs [[WG211/M24Kovacs | Runtime code generation with dependent types ]]
* Lindsey Kuper [[WG211/M24Kuper | Library-Level Choreographic Programming ]]
* Ralf Lämmel [[WG211/M24Laemmel | Type Inference in a Knowledge-Graph Setting]]
* Sam Lindley [[ WG211M24Lindley | Modal Effect Types ]]
* Peter Mosses [[ WG211/M24Mosses | Denotational Semantics in Agda ]]
* Christoph Reichenbach [[ WG211/M23Reichenbach | Circular Attribute Evaluation in Reference Attribute Grammars ]]
* Tiark Rompf [[WG211/M24Rompf | Rhyme: A Data-Centric Multi-Paradigm Query Language ]]
* Amir Shaikhha [[ WG211M24Shaikhha | Democratizing Data Science by Leveraging Structure ]]
* Sven-Bodo Scholz [[WG211/M24Scholz| Hybrid Typing --- unleashing the battle between good error messages and aggressive program optimisation ]]
* Friedrich Steimann [[ WG211/M24Steimann | A really old new metatheory of software languages ]]

We will follow our usual format of interactive talks with an active audience, using a chess clock for timing, as follows. For each talk the speaker and the audience each get at most 25 minutes. The audience does not have to wait until the end of a talk to ask questions; interaction and discussion is encouraged. (But experience from previous meetings shows that it is useful to let the speaker at least finish the introduction before interrupting.) To ensure fairness, administration of the time used by each party is done using a chess clock. Operation of the clock rotates among participants. Both speaker and audience are expected to contribute to make talks and discussions engaging, interesting, and useful. Therefore, we observe a policy of no use of electronic devices during talks (other than the device the speaker uses to present slides). Bring paper and pen for making notes.

== Program / schedule ==

=== Scientific program ===

Updated nightly for the following day.

Tuesday, December 3

* 09:00 - 09:15 Assemble and welcome
** 09:15 - 10:00 Rompf
** 10:00 - 10:45 Steimann
* 10:45 - 11:15 Coffee break
** 11:15 - 12:00 Mosses
* 12:00 - 14:00 Lunch and break
** 14:00 - 14:45 Kuper
** 14:45 - 15:30 Amin
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 Allais

* 19:00 Dinner: David Bann

Wednesday, December 4

Note: if you're planning to walk to the Galleries today, bring comfortable shoes and relatively warm clothes.

* 09:00 - 09:15 Assemble and welcome
** 09:15 - 10:00 Lindley
** 10:00 - 10:45 Brady
* 10:45 - 11:15 Coffee break
** 11:15 - 12:00 Shaikha
* 12:00 - 12:55 Lunch and short break
* 12:55 onwards: afternoon excursion to the Modern Art Galleries

* 19:00 Dinner: Wee Greek Kitchen

Thursday, December 5

* 08:45 - 09:05 Assemble and welcome
** 09:05 - 09:50 Talk 10
** 09:50 - 10:35 Talk 11
* 10:35 - 11:00 Coffee break
** 11:00 - 11:45 Talk 12
** 11:45 - 12:30 Talk 13
* 12:30 - 14:15 Lunch and break
** 14:15 - 15:00 Talk 14
** 15:00 - 15:45 Talk 15
* 15:45 - 17:00 Coffee break transitioning into business meeting
* 20:30 Dinner: Howie's at Waterloo Place

Friday, December 6

* 08:45 - 09:05 Assemble and welcome
** 09:05 - 09:50 Talk 16
** 09:50 - 10:35 Talk 17
* 10:35 - 11:00 Coffee break
** 11:00 - 11:45 Talk 18
** 11:45 - 12:30 Talk 19
* 12:30 - 14:15 Lunch and farewell

=== Social events ===

==== Dinners ====
* Tuesday, 19:00 December 3: [https://www.davidbann.co.uk/ David Bann] ([https://maps.app.goo.gl/6PevFCJjTn1LfbTt5 map])
* Wednesday, 19:00 December 4: [https://weegreekkitchen.co.uk/ Wee Greek Kitchen] ([https://maps.app.goo.gl/HBJab37BAV8PSQbS9 map])
* Thursday, 20:30 December 5: [https://www.howies.uk.com/venues/howies-waterloo-place/ Howie's at Waterloo Place] ([https://maps.app.goo.gl/RwfdtvHfNaRXaZYD6 map], make sure you go to the one at Waterloo Place!)

==== Excursion ====

On Wednesday afternoon, we'll ramble to the [https://www.nationalgalleries.org/visit/scottish-national-gallery-modern-art Modern Art Galleries] [https://maps.app.goo.gl/md1ZDd1XiCBuwBpS6 One] and [https://maps.app.goo.gl/fV8oSdeHQazrL2J2A Two].

Directions:
* 12:55 Arrive independently by '''Bus:''' take the [https://maps.app.goo.gl/nFEdHat3yddNQUxZ9 13 bus from Princes Street stop PU] . See [[ WG211/M24Schedule#Travel_around_Edinburgh | Travel around Edinburgh ]] section on paying your way.
* 13:00 '''Scenic route''' walk (around 1h, dress warmly), details below.

Synchronised activities:
* 13:00 '''Scenic route''': Meet outside New College for the scenic route walk. [https://maps.app.goo.gl/NNq6dFWMTRn64oqN7 Planned route]:
** Princes Street Gardens
** Queensferry Road and Dean Village
** [https://en.wikipedia.org/wiki/Water_of_Leith_Walkway Water of Leith Walkway]
** [https://www.aidsmemorial.info/memorial/id=98/life_tribute_edinburgh_aids_memorial.html Life Tribute]

* 15:00-16:15. Guided tour of [https://maps.app.goo.gl/fV8oSdeHQazrL2J2A Modern Art Gallery Two], meet Katharine and Duncan outside.

* 16:57 [https://maps.app.goo.gl/jXtfbjfkFGjhRCBd7 Bus back to Princes Street]. See [[ WG211/M24Schedule#Travel_around_Edinburgh| Travel around Edinburgh ]] section on paying your way.
* 17:00 Galleries close.

'''Warning:''' Walking from the Galleries to the Wee Greek Kitchen will be around 1h, in the dark and cold. If you choose to walk, I recommend you stop somewhere along the way to get warm again, maybe drink a cup of tea or mulled wine. Here's a route with the [https://maps.app.goo.gl/Uitqc7dCrY6eyvuj6 last possible option to do so], but feel free to duck into any nice place along the way.

==== Thursday pre-dinner activities ====

Especially if you're not attending the business meeting, there is plenty of time to spend between sunset and dinner. A nice activity can be to stroll around the [https://www.visitscotland.com/things-to-do/events/christmas-winter-festivals/edinburgh Edinburgh Chrismas Market]. It's [https://maps.app.goo.gl/MehaaffXdeehk6NMA hard to miss], and straight down from the venue, with Howie's at Waterloo Place just up the road.

WG211/M24Schedule

2024-12-03T17:26:17Z

Jacques: /* Scientific program */

= IFIP Working Group 2.11, Twenty-fourth Meeting =

== December 3rd (Tues) - 6th (Fri) in Edinburgh, Scotland, UK ==

The meeting will be hosted by [https://www.denotational.co.uk/ Ohad Kammar], who will write in the first person in the remainder.

The meeting will last 3.5 days; the first three days (Tues-Thur) will
be full-day whereas the last day (Fri) will be a half-day session.

=== Venue ===

[https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.07 Althaus-Reid Room, 1.07] ([http://exhibition.div.ed.ac.uk/rooms-renamed-in-honour-of-two-inspirational-female-theologians/ named after the theologian Marcella Althaus-Reid])

New College 
School of Divinity 
The University of Edinburgh 
Central Campus 
1 Mound Place 
Edinburgh EH1 2LU

This is unfortunately '''not''' the School of Informatics, which is about 15 minutes walk south from this venue.

A [https://maps.app.goo.gl/oCXGNCb2ax68WS6B6/ Google map] with the venue, hotels, and meeting-relevant locations.

==== WiFi Access ====

* '''eduroam.''' If you have eduroam credentials, you may use them to access the eduroam network while at Edinburgh.

* '''guest account.''' If you know that eduroam will not work for you, I can set you up with a guest account. Please indicate that you will definitely need a guest account in your registration form. You can always let me know after registration whether you need one, including during the meeting. Guests must abide by the [https://vpnreg.ucs.ed.ac.uk/admin/compregs.pdf computing regulations].

* '''Visit-Ed.''' If eduroam does not work for you and you don't have a guest account, you can try using the [https://www.ed.ac.uk/information-services/computing/desktop-personal/wifi-networking/guest-alumni-wifi-access Visit-Ed service] described in the middle of that page. It requires registration by Facebook, LinkedIn, WhatsApp, or text message (international numbers included).

==== Workspace ====

A quiet area for shared use is available in the [https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.09 Porteous Room 1.09]
(you can read more about it
[https://exhibition.div.ed.ac.uk/porteous%E2%80%AFroom/ here]) on the
same floor as the main room.

== Travel ==

=== Travel to Edinburgh ===

==== Air ====

[https://www.edinburghairport.com/ Edinburgh Airport] is located
approximately 8 miles away from the city centre.

The [https://edinburghtrams.com/ Edinburgh tram] runs from the
airport every 7 minutes, the last tram from the airport leaves after
22:30 (see tram webpage).

The [https://airlink100.co.uk/ Airlink bus] (service 100) runs
between the airport and the city centre, reaching Waverley Bridge
railway station in 25 minutes. The route to and from the airport runs
24 hours a day every 10 minutes approximately during the day.

Most advance hire taxi companies will offer an airport pick-up
service. [https://www.taxis-edinburgh.co.uk/ Here's one], but any will
do. There's also a taxi hailing stand at the airport, follow the signs.

You can also fly into another main UK city and continue to Edinburgh by [[#Train|train]].

==== Train ====

Edinburgh is well-connected to most other main UK cities. There are a
few faster trains from London (about 4h25min) every day. You can use [https://www.nationalrail.co.uk/ National Rail] to plan your trip and link you to the appropriate provider.

I have enjoyed taking the Eurostar from the main continent to London. There is also the [https://www.sleeper.scot/ Caledonian Sleeper] that can get you to Edinburgh or London by 7am very slowly overnight.

=== Travel around Edinburgh ===

Edinburgh is somewhat hilly and the venue is located [https://upload.wikimedia.org/wikipedia/commons/f/ff/The_Mound%2C_Edinburgh%2C_18_September_2014.jpg up a slope].
If that is not a problem, then Edinburgh is quite walkable.

Public transportation is available. Check out [https://transportforedinburgh.com/ Transport for Edinburgh] for all the details.

* Buses. [https://www.lothianbuses.com/ Lothian buses] operates many of the relevant buses. You can pay contactless with a card or app and there's a capped pay program ('TapTapCap'). Here's the [https://www.lothianbuses.com/wp-content/uploads/2024/09/Network_Map_240908.pdf map], but I usually use Google maps for directions.

* Taxis. You can usually just hail a black cab from anywhere in the centre, see their [https://www.taxis-edinburgh.co.uk/ webpage] for advance bookings. Your favourite search engine will provide other taxi companies.

* Tram. The [https://edinburghtrams.com/ Edinburgh tram] stops fairly close to the venue, so can be an easy way to the venue.

* Uber operates in Edinburgh.

== Accommodation ==

The venue is located quite centrally, with many hotels nearby. Here are some 4-star and 3-star suggestions nearby, but you'll probably find something charming by your own (just watch out for scams). The tram and buses make it easy to also stay somewhere away from the centre and commute in if you prefer.

Hotel suggestions:
* [https://www.apexhotels.co.uk/destinations/edinburgh/apex-city-of-edinburgh-hotel/ Apex City of Edinburgh Hotel]. Main suggestion, slightly-up-and-steep-downhill from the venue. We have a 10% discount code, which I will email once I have it. '''Note:''' There is a slightly more full Apex hotel on the same street which I listed before, so if you want to be in the suggested hotel, make sure you're in the correct one.
* [https://www.motel-one.com/en/hotels/edinburgh/hotel-edinburgh-royal/ Motel One Edinburgh Royal]. A cheaper option, steep downhill from the venue.
* [https://www.scotsmanhotel.co.uk/ Scotsman Hotel]. A more expensive option, slightly-up-and-moderate-downhill from the venue.

== Weather ==

Edinburgh has temperate (and temperamental) climate, and currently the broadcast is 0 to 8 degrees centrigade during the day, and perhaps -1 degrees centrigade at night and in the early morning. It will be windy with gusts of wind of up to 35 mph, and potentially rainy, so make sure you dress appropriately. Locals wear waterproof/resistant clothes. Umbrellas tend to be rather useless due to the wind, one typically recognises the tourists by their futile struggles to turn inside-out umbrellas
while getting soaked.

The days are quite short in December, and you might be able to catch
the sunrise heading into the venue in the morning. I recommend
avoiding missing most of the daylight completely, e.g., make sure you go
for a short walk outside during the lunch break.

== Tourism ==

Edinburgh offers many tourist attractions and museums, and many are located centrally and close to the venue. Entrance to museums and galleries is free. Entrance to some exhibitions in the museum or gallery will require buying a separate ticket.

The meeting takes place just after [https://www.visitscotland.com/things-to-do/events/st-andrews-day Saint Andrew's Day] weekend, and Monday will be a public holiday in Scotland.
That should not affect travel, although the airport and railway might be busier than usual.

[https://www.historicenvironment.scot/about-us/news/st-andrews-day-ticket-giveaway/ Historic Environment Scotland] offer free tickets to visit some Historic Scotland attractions on Saint Andrew's day, such as the Edinburgh Castle. Registration for [https://www.historicenvironment.scot/ticket-giveaway/ free tourism tickets] opens Tuesday 12 November 10am UK time until Thursday 28 November.

If you go to the Castle, try to get there before 1pm to see them fire the Cannon.

Very near the venue is Scott Monument which you can climb, for a fee,
during the day for a stunning view. There will be a German Christmas
Market nearby I believe.

There are several hills within the city and you can easily climb up. The easiest (and closest to the venue) is [https://ewh.org.uk/calton-hill/ Calton Hill] and has a road and steps leading all the way up.

[https://www.geolsoc.org.uk/GeositesArthursSeat Arthur's Seat and the Salisbury Crags] are most visible from the centre. It takes about 1.5 hours roundtrip to get to the top. The grass can be slippery after a rain, and people can slip to their death, so wear good shoes and only climb during the day.

You can sometimes take a daytrip on a guided tour to the highlands or a whisky distillery. If you have the time, I recommend spending a few days in the former, and maybe visiting some of the latter.

I'll try to add more stuff here, especially if people send me recommendations or ask questions.

== Registration ==
Please register [https://www.epay.ed.ac.uk/conferences-and-events/college-of-science-and-engineering/school-of-informatics/informatics-events/ifip-working-group here].
After you 'Book Event', please choose either:
* '4 Day Attendee' or
* iff you're only attending partially, tick the boxes for the relevant days.

(If you plan to partially attend, please discuss with the Chairs first. I think it's somewhat unusual.)

You'll be prompted for additional details like contact details, allergies and dietary requirements after: adding to basket; proceeding to checkout; registering.

Please let me know if you have any problems. Please let me know if you won't be able to register before Thursday 28 Nov.

== Attendance ==
(Alphabetical by last name please)

* Guillaume Allais
* Nada Amin
* Sandrine Blazy
* Edwin Brady
* Jacques Carette
* Sebastian Erdweg
* Jeremy Gibbons
* Kevin Hammond
* Ohad Kammar
* Paul Kelly (on 5-6 only)
* Andras Kovacs
* Lindsey Kuper
* Julia Lawall
* Ralf Lämmel
* Sam Lindley
* James McKinna
* Peter Mosses
* Christoph Reichenbach
* Tiark Rompf
* Sven-Bodo Scholz
* Amir Shaikhha
* Friedrich Steimann
* Jeremy Yallop

=== Local Observers ===
* Greg Brown
* Justus Matthiesen
* Nachiappan Valliappan
* Robert Wright

== Talks ==

See below for the schedule (but note that the actual scheduling of talks will not be available until the meeting starts). Members: please add yourself and your topic, alphabetically ordered by surname:
| Scoped and Typed Staging by Evaluation
* Guillaume Allais [[WG211/M24Allais | Scoped and Typed Staging by Evaluation ]]
* Nada Amin [[WG211/M24Amin | Experiments in verified program synthesis with LLMs ]]
* Sandrine Blazy [[WG211/M24Blazy | A Mechanized Semantics for Dataflow Circuits ]]
* Edwin Brady [[WG211/M24Brady | "Normalisation by Compilation": Typechecking Dependent Types via the Scheme Runtime ]]
* Jacques Carette [[WG211/M24Carette | Partial Evaluation from Equational Theories ]]
* Sebastian Erdweg [[WG211/M24Erdweg | Stateful Differential Operators for Incremental Computing ]]
* Jeremy Gibbons [[WG211/M24Gibbons | Continuation−Passing Style‚ Defunctionalization‚ Accumulations‚ and Associativity ]]
* Kevin Hammond [[WG211/M24Hammond | Using Formal Methods at Scale in the Delivery of a High Assurance Distributed System: the Cardano Blockchain Implementation in Haskell ]]
* Andras Kovacs [[WG211/M24Kovacs | Runtime code generation with dependent types ]]
* Lindsey Kuper [[WG211/M24Kuper | Library-Level Choreographic Programming ]]
* Ralf Lämmel [[WG211/M24Laemmel | Type Inference in a Knowledge-Graph Setting]]
* Sam Lindley [[ WG211M24Lindley | Modal Effect Types ]]
* Peter Mosses [[ WG211/M24Mosses | Denotational Semantics in Agda ]]
* Christoph Reichenbach [[ WG211/M23Reichenbach | Circular Attribute Evaluation in Reference Attribute Grammars ]]
* Tiark Rompf [[WG211/M24Rompf | Rhyme: A Data-Centric Multi-Paradigm Query Language ]]
* Amir Shaikhha [[ WG211M24Shaikhha | Democratizing Data Science by Leveraging Structure ]]
* Sven-Bodo Scholz [[WG211/M24Scholz| Hybrid Typing --- unleashing the battle between good error messages and aggressive program optimisation ]]
* Friedrich Steimann [[ WG211/M24Steimann | A really old new metatheory of software languages ]]

We will follow our usual format of interactive talks with an active audience, using a chess clock for timing, as follows. For each talk the speaker and the audience each get at most 25 minutes. The audience does not have to wait until the end of a talk to ask questions; interaction and discussion is encouraged. (But experience from previous meetings shows that it is useful to let the speaker at least finish the introduction before interrupting.) To ensure fairness, administration of the time used by each party is done using a chess clock. Operation of the clock rotates among participants. Both speaker and audience are expected to contribute to make talks and discussions engaging, interesting, and useful. Therefore, we observe a policy of no use of electronic devices during talks (other than the device the speaker uses to present slides). Bring paper and pen for making notes.

== Program / schedule ==

=== Scientific program ===

Updated nightly for the following day.

Tuesday, December 3

* 09:00 - 09:15 Assemble and welcome
** 09:15 - 10:00 Rompf
** 10:00 - 10:45 Steimann
* 10:45 - 11:15 Coffee break
** 11:15 - 12:00 Mosses
* 12:00 - 14:00 Lunch and break
** 14:00 - 14:45 Kuper
** 14:45 - 15:30 Amin
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 Allais

* 19:00 Dinner: David Bann

Wednesday, December 4

Note: if you're planning to walk to the Galleries today, bring comfortable shoes and relatively warm clothes.

* 09:00 - 09:15 Assemble and welcome
** 09:15 - 10:00 Lindley
** 10:00 - 10:45 Brady
* 10:45 - 11:15 Coffee break
** 11:15 - 12:00 Shaika
* 12:00 - 12:55 Lunch and short break
* 12:55 onwards: afternoon excursion to the Modern Art Galleries

* 19:00 Dinner: Wee Greek Kitchen

Thursday, December 5

* 08:45 - 09:05 Assemble and welcome
** 09:05 - 09:50 Talk 10
** 09:50 - 10:35 Talk 11
* 10:35 - 11:00 Coffee break
** 11:00 - 11:45 Talk 12
** 11:45 - 12:30 Talk 13
* 12:30 - 14:15 Lunch and break
** 14:15 - 15:00 Talk 14
** 15:00 - 15:45 Talk 15
* 15:45 - 17:00 Coffee break transitioning into business meeting
* 20:30 Dinner: Howie's at Waterloo Place

Friday, December 6

* 08:45 - 09:05 Assemble and welcome
** 09:05 - 09:50 Talk 16
** 09:50 - 10:35 Talk 17
* 10:35 - 11:00 Coffee break
** 11:00 - 11:45 Talk 18
** 11:45 - 12:30 Talk 19
* 12:30 - 14:15 Lunch and farewell

=== Social events ===

==== Dinners ====
* Tuesday, 19:00 December 3: [https://www.davidbann.co.uk/ David Bann] ([https://maps.app.goo.gl/6PevFCJjTn1LfbTt5 map])
* Wednesday, 19:00 December 4: [https://weegreekkitchen.co.uk/ Wee Greek Kitchen] ([https://maps.app.goo.gl/HBJab37BAV8PSQbS9 map])
* Thursday, 20:30 December 5: [https://www.howies.uk.com/venues/howies-waterloo-place/ Howie's at Waterloo Place] ([https://maps.app.goo.gl/RwfdtvHfNaRXaZYD6 map], make sure you go to the one at Waterloo Place!)

==== Excursion ====

On Wednesday afternoon, we'll ramble to the [https://www.nationalgalleries.org/visit/scottish-national-gallery-modern-art Modern Art Galleries] [https://maps.app.goo.gl/md1ZDd1XiCBuwBpS6 One] and [https://maps.app.goo.gl/fV8oSdeHQazrL2J2A Two].

Directions:
* 12:55 Arrive independently by '''Bus:''' take the [https://maps.app.goo.gl/nFEdHat3yddNQUxZ9 13 bus from Princes Street stop PU] . See [[ WG211/M24Schedule#Travel_around_Edinburgh | Travel around Edinburgh ]] section on paying your way.
* 13:00 '''Scenic route''' walk (around 1h, dress warmly), details below.

Synchronised activities:
* 13:00 '''Scenic route''': Meet outside New College for the scenic route walk. [https://maps.app.goo.gl/NNq6dFWMTRn64oqN7 Planned route]:
** Princes Street Gardens
** Queensferry Road and Dean Village
** [https://en.wikipedia.org/wiki/Water_of_Leith_Walkway Water of Leith Walkway]
** [https://www.aidsmemorial.info/memorial/id=98/life_tribute_edinburgh_aids_memorial.html Life Tribute]

* 15:00-16:15. Guided tour of [https://maps.app.goo.gl/fV8oSdeHQazrL2J2A Modern Art Gallery Two], meet Katharine and Duncan outside.

* 16:57 [https://maps.app.goo.gl/jXtfbjfkFGjhRCBd7 Bus back to Princes Street]. See [[ WG211/M24Schedule#Travel_around_Edinburgh| Travel around Edinburgh ]] section on paying your way.
* 17:00 Galleries close.

'''Warning:''' Walking from the Galleries to the Wee Greek Kitchen will be around 1h, in the dark and cold. If you choose to walk, I recommend you stop somewhere along the way to get warm again, maybe drink a cup of tea or mulled wine. Here's a route with the [https://maps.app.goo.gl/Uitqc7dCrY6eyvuj6 last possible option to do so], but feel free to duck into any nice place along the way.

==== Thursday pre-dinner activities ====

Especially if you're not attending the business meeting, there is plenty of time to spend between sunset and dinner. A nice activity can be to stroll around the [https://www.visitscotland.com/things-to-do/events/christmas-winter-festivals/edinburgh Edinburgh Chrismas Market]. It's [https://maps.app.goo.gl/MehaaffXdeehk6NMA hard to miss], and straight down from the venue, with Howie's at Waterloo Place just up the road.

WG211/M24Schedule

2024-12-03T13:53:51Z

Jacques: /* Talks */

= IFIP Working Group 2.11, Twenty-fourth Meeting =

== December 3rd (Tues) - 6th (Fri) in Edinburgh, Scotland, UK ==

The meeting will be hosted by [https://www.denotational.co.uk/ Ohad Kammar], who will write in the first person in the remainder.

The meeting will last 3.5 days; the first three days (Tues-Thur) will
be full-day whereas the last day (Fri) will be a half-day session.

=== Venue ===

[https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.07 Althaus-Reid Room, 1.07] ([http://exhibition.div.ed.ac.uk/rooms-renamed-in-honour-of-two-inspirational-female-theologians/ named after the theologian Marcella Althaus-Reid])

New College 
School of Divinity 
The University of Edinburgh 
Central Campus 
1 Mound Place 
Edinburgh EH1 2LU

This is unfortunately '''not''' the School of Informatics, which is about 15 minutes walk south from this venue.

A [https://maps.app.goo.gl/oCXGNCb2ax68WS6B6/ Google map] with the venue, hotels, and meeting-relevant locations.

==== WiFi Access ====

* '''eduroam.''' If you have eduroam credentials, you may use them to access the eduroam network while at Edinburgh.

* '''guest account.''' If you know that eduroam will not work for you, I can set you up with a guest account. Please indicate that you will definitely need a guest account in your registration form. You can always let me know after registration whether you need one, including during the meeting. Guests must abide by the [https://vpnreg.ucs.ed.ac.uk/admin/compregs.pdf computing regulations].

* '''Visit-Ed.''' If eduroam does not work for you and you don't have a guest account, you can try using the [https://www.ed.ac.uk/information-services/computing/desktop-personal/wifi-networking/guest-alumni-wifi-access Visit-Ed service] described in the middle of that page. It requires registration by Facebook, LinkedIn, WhatsApp, or text message (international numbers included).

==== Workspace ====

A quiet area for shared use is available in the [https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.09 Porteous Room 1.09]
(you can read more about it
[https://exhibition.div.ed.ac.uk/porteous%E2%80%AFroom/ here]) on the
same floor as the main room.

== Travel ==

=== Travel to Edinburgh ===

==== Air ====

[https://www.edinburghairport.com/ Edinburgh Airport] is located
approximately 8 miles away from the city centre.

The [https://edinburghtrams.com/ Edinburgh tram] runs from the
airport every 7 minutes, the last tram from the airport leaves after
22:30 (see tram webpage).

The [https://airlink100.co.uk/ Airlink bus] (service 100) runs
between the airport and the city centre, reaching Waverley Bridge
railway station in 25 minutes. The route to and from the airport runs
24 hours a day every 10 minutes approximately during the day.

Most advance hire taxi companies will offer an airport pick-up
service. [https://www.taxis-edinburgh.co.uk/ Here's one], but any will
do. There's also a taxi hailing stand at the airport, follow the signs.

You can also fly into another main UK city and continue to Edinburgh by [[#Train|train]].

==== Train ====

Edinburgh is well-connected to most other main UK cities. There are a
few faster trains from London (about 4h25min) every day. You can use [https://www.nationalrail.co.uk/ National Rail] to plan your trip and link you to the appropriate provider.

I have enjoyed taking the Eurostar from the main continent to London. There is also the [https://www.sleeper.scot/ Caledonian Sleeper] that can get you to Edinburgh or London by 7am very slowly overnight.

=== Travel around Edinburgh ===

Edinburgh is somewhat hilly and the venue is located [https://upload.wikimedia.org/wikipedia/commons/f/ff/The_Mound%2C_Edinburgh%2C_18_September_2014.jpg up a slope].
If that is not a problem, then Edinburgh is quite walkable.

Public transportation is available. Check out [https://transportforedinburgh.com/ Transport for Edinburgh] for all the details.

* Buses. [https://www.lothianbuses.com/ Lothian buses] operates many of the relevant buses. You can pay contactless with a card or app and there's a capped pay program ('TapTapCap'). Here's the [https://www.lothianbuses.com/wp-content/uploads/2024/09/Network_Map_240908.pdf map], but I usually use Google maps for directions.

* Taxis. You can usually just hail a black cab from anywhere in the centre, see their [https://www.taxis-edinburgh.co.uk/ webpage] for advance bookings. Your favourite search engine will provide other taxi companies.

* Tram. The [https://edinburghtrams.com/ Edinburgh tram] stops fairly close to the venue, so can be an easy way to the venue.

* Uber operates in Edinburgh.

== Accommodation ==

The venue is located quite centrally, with many hotels nearby. Here are some 4-star and 3-star suggestions nearby, but you'll probably find something charming by your own (just watch out for scams). The tram and buses make it easy to also stay somewhere away from the centre and commute in if you prefer.

Hotel suggestions:
* [https://www.apexhotels.co.uk/destinations/edinburgh/apex-city-of-edinburgh-hotel/ Apex City of Edinburgh Hotel]. Main suggestion, slightly-up-and-steep-downhill from the venue. We have a 10% discount code, which I will email once I have it. '''Note:''' There is a slightly more full Apex hotel on the same street which I listed before, so if you want to be in the suggested hotel, make sure you're in the correct one.
* [https://www.motel-one.com/en/hotels/edinburgh/hotel-edinburgh-royal/ Motel One Edinburgh Royal]. A cheaper option, steep downhill from the venue.
* [https://www.scotsmanhotel.co.uk/ Scotsman Hotel]. A more expensive option, slightly-up-and-moderate-downhill from the venue.

== Weather ==

Edinburgh has temperate (and temperamental) climate, and currently the broadcast is 0 to 8 degrees centrigade during the day, and perhaps -1 degrees centrigade at night and in the early morning. It will be windy with gusts of wind of up to 35 mph, and potentially rainy, so make sure you dress appropriately. Locals wear waterproof/resistant clothes. Umbrellas tend to be rather useless due to the wind, one typically recognises the tourists by their futile struggles to turn inside-out umbrellas
while getting soaked.

The days are quite short in December, and you might be able to catch
the sunrise heading into the venue in the morning. I recommend
avoiding missing most of the daylight completely, e.g., make sure you go
for a short walk outside during the lunch break.

== Tourism ==

Edinburgh offers many tourist attractions and museums, and many are located centrally and close to the venue. Entrance to museums and galleries is free. Entrance to some exhibitions in the museum or gallery will require buying a separate ticket.

The meeting takes place just after [https://www.visitscotland.com/things-to-do/events/st-andrews-day Saint Andrew's Day] weekend, and Monday will be a public holiday in Scotland.
That should not affect travel, although the airport and railway might be busier than usual.

[https://www.historicenvironment.scot/about-us/news/st-andrews-day-ticket-giveaway/ Historic Environment Scotland] offer free tickets to visit some Historic Scotland attractions on Saint Andrew's day, such as the Edinburgh Castle. Registration for [https://www.historicenvironment.scot/ticket-giveaway/ free tourism tickets] opens Tuesday 12 November 10am UK time until Thursday 28 November.

If you go to the Castle, try to get there before 1pm to see them fire the Cannon.

Very near the venue is Scott Monument which you can climb, for a fee,
during the day for a stunning view. There will be a German Christmas
Market nearby I believe.

There are several hills within the city and you can easily climb up. The easiest (and closest to the venue) is [https://ewh.org.uk/calton-hill/ Calton Hill] and has a road and steps leading all the way up.

[https://www.geolsoc.org.uk/GeositesArthursSeat Arthur's Seat and the Salisbury Crags] are most visible from the centre. It takes about 1.5 hours roundtrip to get to the top. The grass can be slippery after a rain, and people can slip to their death, so wear good shoes and only climb during the day.

You can sometimes take a daytrip on a guided tour to the highlands or a whisky distillery. If you have the time, I recommend spending a few days in the former, and maybe visiting some of the latter.

I'll try to add more stuff here, especially if people send me recommendations or ask questions.

== Registration ==
Please register [https://www.epay.ed.ac.uk/conferences-and-events/college-of-science-and-engineering/school-of-informatics/informatics-events/ifip-working-group here].
After you 'Book Event', please choose either:
* '4 Day Attendee' or
* iff you're only attending partially, tick the boxes for the relevant days.

(If you plan to partially attend, please discuss with the Chairs first. I think it's somewhat unusual.)

You'll be prompted for additional details like contact details, allergies and dietary requirements after: adding to basket; proceeding to checkout; registering.

Please let me know if you have any problems. Please let me know if you won't be able to register before Thursday 28 Nov.

== Attendance ==
(Alphabetical by last name please)

* Guillaume Allais
* Nada Amin
* Sandrine Blazy
* Edwin Brady
* Jacques Carette
* Sebastian Erdweg
* Jeremy Gibbons
* Kevin Hammond
* Ohad Kammar
* Paul Kelly (on 5-6 only)
* Andras Kovacs
* Lindsey Kuper
* Julia Lawall
* Ralf Lämmel
* Sam Lindley
* James McKinna
* Peter Mosses
* Christoph Reichenbach
* Tiark Rompf
* Sven-Bodo Scholz
* Amir Shaikhha
* Friedrich Steimann
* Jeremy Yallop

=== Local Observers ===
* Greg Brown
* Justus Matthiesen
* Nachiappan Valliappan
* Robert Wright

== Talks ==

See below for the schedule (but note that the actual scheduling of talks will not be available until the meeting starts). Members: please add yourself and your topic, alphabetically ordered by surname:
| Scoped and Typed Staging by Evaluation
* Guillaume Allais [[WG211/M24Allais | Scoped and Typed Staging by Evaluation ]]
* Nada Amin [[WG211/M24Amin | Experiments in verified program synthesis with LLMs ]]
* Sandrine Blazy [[WG211/M24Blazy | A Mechanized Semantics for Dataflow Circuits ]]
* Edwin Brady [[WG211/M24Brady | "Normalisation by Compilation": Typechecking Dependent Types via the Scheme Runtime ]]
* Jacques Carette [[WG211/M24Carette | Partial Evaluation from Equational Theories ]]
* Sebastian Erdweg [[WG211/M24Erdweg | Stateful Differential Operators for Incremental Computing ]]
* Jeremy Gibbons [[WG211/M24Gibbons | Continuation−Passing Style‚ Defunctionalization‚ Accumulations‚ and Associativity ]]
* Kevin Hammond [[WG211/M24Hammond | Using Formal Methods at Scale in the Delivery of a High Assurance Distributed System: the Cardano Blockchain Implementation in Haskell ]]
* Andras Kovacs [[WG211/M24Kovacs | Runtime code generation with dependent types ]]
* Lindsey Kuper [[WG211/M24Kuper | Library-Level Choreographic Programming ]]
* Ralf Lämmel [[WG211/M24Laemmel | Type Inference in a Knowledge-Graph Setting]]
* Sam Lindley [[ WG211M24Lindley | Modal Effect Types ]]
* Peter Mosses [[ WG211/M24Mosses | Denotational Semantics in Agda ]]
* Christoph Reichenbach [[ WG211/M23Reichenbach | Circular Attribute Evaluation in Reference Attribute Grammars ]]
* Tiark Rompf [[WG211/M24Rompf | Rhyme: A Data-Centric Multi-Paradigm Query Language ]]
* Amir Shaikhha [[ WG211M24Shaikhha | Democratizing Data Science by Leveraging Structure ]]
* Sven-Bodo Scholz [[WG211/M24Scholz| Hybrid Typing --- unleashing the battle between good error messages and aggressive program optimisation ]]
* Friedrich Steimann [[ WG211/M24Steimann | A really old new metatheory of software languages ]]

We will follow our usual format of interactive talks with an active audience, using a chess clock for timing, as follows. For each talk the speaker and the audience each get at most 25 minutes. The audience does not have to wait until the end of a talk to ask questions; interaction and discussion is encouraged. (But experience from previous meetings shows that it is useful to let the speaker at least finish the introduction before interrupting.) To ensure fairness, administration of the time used by each party is done using a chess clock. Operation of the clock rotates among participants. Both speaker and audience are expected to contribute to make talks and discussions engaging, interesting, and useful. Therefore, we observe a policy of no use of electronic devices during talks (other than the device the speaker uses to present slides). Bring paper and pen for making notes.

== Program / schedule ==

=== Scientific program ===

Updated nightly for the following day.

Tuesday, December 3

* 09:00 - 09:15 Assemble and welcome
** 09:15 - 10:00 Rompf
** 10:00 - 10:45 Steimann
* 10:45 - 11:15 Coffee break
** 11:15 - 12:00 Mosses
* 12:00 - 14:00 Lunch and break
** 14:00 - 14:45 Kuper
** 14:45 - 15:30 Amin
* 15:30 - 16:00 Coffee break
** 16:00 - 16:45 Allais

* 19:00 Dinner: David Bann

Wednesday, December 4

Note: if you're planning to walk to the Galleries today, bring comfortable shoes and relatively warm clothes.

* 09:00 - 09:15 Assemble and welcome
** 09:15 - 10:00 Talk 07
** 10:00 - 10:45 Talk 08
* 10:45 - 11:15 Coffee break
** 11:15 - 12:00 Talk 09
* 12:00 - 12:55 Lunch and short break
* 12:55 onwards: afternoon excursion to the Modern Art Galleries

* 19:00 Dinner: Wee Greek Kitchen

Thursday, December 5

* 08:45 - 09:05 Assemble and welcome
** 09:05 - 09:50 Talk 10
** 09:50 - 10:35 Talk 11
* 10:35 - 11:00 Coffee break
** 11:00 - 11:45 Talk 12
** 11:45 - 12:30 Talk 13
* 12:30 - 14:15 Lunch and break
** 14:15 - 15:00 Talk 14
** 15:00 - 15:45 Talk 15
* 15:45 - 17:00 Coffee break transitioning into business meeting
* 20:30 Dinner: Howie's at Waterloo Place

Friday, December 6

* 08:45 - 09:05 Assemble and welcome
** 09:05 - 09:50 Talk 16
** 09:50 - 10:35 Talk 17
* 10:35 - 11:00 Coffee break
** 11:00 - 11:45 Talk 18
** 11:45 - 12:30 Talk 19
* 12:30 - 14:15 Lunch and farewell

=== Social events ===

==== Dinners ====
* Tuesday, 19:00 December 3: [https://www.davidbann.co.uk/ David Bann] ([https://maps.app.goo.gl/6PevFCJjTn1LfbTt5 map])
* Wednesday, 19:00 December 4: [https://weegreekkitchen.co.uk/ Wee Greek Kitchen] ([https://maps.app.goo.gl/HBJab37BAV8PSQbS9 map])
* Thursday, 20:30 December 5: [https://www.howies.uk.com/venues/howies-waterloo-place/ Howie's at Waterloo Place] ([https://maps.app.goo.gl/RwfdtvHfNaRXaZYD6 map], make sure you go to the one at Waterloo Place!)

==== Excursion ====

On Wednesday afternoon, we'll ramble to the [https://www.nationalgalleries.org/visit/scottish-national-gallery-modern-art Modern Art Galleries] [https://maps.app.goo.gl/md1ZDd1XiCBuwBpS6 One] and [https://maps.app.goo.gl/fV8oSdeHQazrL2J2A Two].

Directions:
* 12:55 Arrive independently by '''Bus:''' take the [https://maps.app.goo.gl/nFEdHat3yddNQUxZ9 13 bus from Princes Street stop PU] . See [[ WG211/M24Schedule#Travel_around_Edinburgh | Travel around Edinburgh ]] section on paying your way.
* 13:00 '''Scenic route''' walk (around 1h, dress warmly), details below.

Synchronised activities:
* 13:00 '''Scenic route''': Meet outside New College for the scenic route walk. [https://maps.app.goo.gl/NNq6dFWMTRn64oqN7 Planned route]:
** Princes Street Gardens
** Queensferry Road and Dean Village
** [https://en.wikipedia.org/wiki/Water_of_Leith_Walkway Water of Leith Walkway]
** [https://www.aidsmemorial.info/memorial/id=98/life_tribute_edinburgh_aids_memorial.html Life Tribute]

* 15:00-16:15. Guided tour of [https://maps.app.goo.gl/fV8oSdeHQazrL2J2A Modern Art Gallery Two], meet Katharine and Duncan outside.

* 16:57 [https://maps.app.goo.gl/jXtfbjfkFGjhRCBd7 Bus back to Princes Street]. See [[ WG211/M24Schedule#Travel_around_Edinburgh| Travel around Edinburgh ]] section on paying your way.
* 17:00 Galleries close.

'''Warning:''' Walking from the Galleries to the Wee Greek Kitchen will be around 1h, in the dark and cold. If you choose to walk, I recommend you stop somewhere along the way to get warm again, maybe drink a cup of tea or mulled wine. Here's a route with the [https://maps.app.goo.gl/Uitqc7dCrY6eyvuj6 last possible option to do so], but feel free to duck into any nice place along the way.

==== Thursday pre-dinner activities ====

Especially if you're not attending the business meeting, there is plenty of time to spend between sunset and dinner. A nice activity can be to stroll around the [https://www.visitscotland.com/things-to-do/events/christmas-winter-festivals/edinburgh Edinburgh Chrismas Market]. It's [https://maps.app.goo.gl/MehaaffXdeehk6NMA hard to miss], and straight down from the venue, with Howie's at Waterloo Place just up the road.

WG211/M24Rompf

2024-12-01T16:38:52Z

Jacques: Created page with "We present Rhyme, an expressive language designed for high-level data manipulation, with a primary focus on querying and transforming nested structures such as JSON and tensor..."

We present Rhyme, an expressive language designed for high-level data manipulation, with a primary focus on querying and transforming nested structures such as JSON and tensors, while yielding nested structures as output. Rhyme draws inspiration from a diverse range of declarative languages, including Datalog, APL, JQ, Einstein summation (Einsum), GraphQL, and more recent functional logic programming languages like Verse. It has a syntax that closely resembles existing object notation, puts a large emphasis on easy composition through metaprogramming, and has the ability to perform query optimization and code generation through an expressive intermediate representation (IR). Our IR comprises loop-free and branch-free code with program structure implicitly captured via dependencies. Rhyme is designed for multi-paradigm workloads, allowing it to accommodate typical data pro- cessing operations such as aggregations, group-bys, and joins, along with tensor expressions (à la einops) and various interactions with the outside world (e.g., visualizing query outputs with tables, charts, and so on).

WG211/M24Allais

2024-11-29T13:59:14Z

Jacques: Created page with "Using a dependently typed host language, we give a well scoped-and-typed by construction presentation of a minimal two level simply typed calculus with a static and a dynamic..."

Using a dependently typed host language, we give a well scoped-and-typed by construction presentation of a minimal two level simply typed calculus with a static and a dynamic stage. The staging function partially evaluating the parts of a term that are static is obtained by a model construction inspired by normalisation by evaluation.

We then go on to demonstrate how this minimal language can be extended to provide additional metaprogramming capabilities, and to define a higher order functional language evaluating to digital circuit descriptions.

WG211/M24Schedule

2024-11-29T13:58:57Z

Jacques: /* Talks */

= IFIP Working Group 2.11, Twenty-fourth Meeting =

== December 3rd (Tues) - 6th (Fri) in Edinburgh, Scotland, UK ==

The meeting will be hosted by [https://www.denotational.co.uk/ Ohad Kammar], who will write in the first person in the remainder. If you want to know anything, please email me. This page is not yet finished, I'll try to add the missing information as soon as possible.

The meeting will last 3.5 days; the first three days (Tues-Thur) will
be full-day whereas the last day (Fri) will be a half-day session.

=== Venue ===

[https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.07 Althaus-Reid Room, 1.07] ([http://exhibition.div.ed.ac.uk/rooms-renamed-in-honour-of-two-inspirational-female-theologians/ named after the theologian Marcella Althaus-Reid])

New College 
School of Divinity 
The University of Edinburgh 
Central Campus 
1 Mound Place 
Edinburgh EH1 2LU

This is unfortunately '''not''' the School of Informatics, which is about 15 minutes walk south from this venue.

A [https://maps.app.goo.gl/oCXGNCb2ax68WS6B6/ Google map] with the venue, hotels, and meeting-relevant locations.

==== WiFi Access ====

* '''eduroam.''' If you have eduroam credentials, you may use them to access the eduroam network while at Edinburgh.

* '''guest account.''' If you know that eduroam will not work for you, I can set you up with a guest account. Please indicate that you will definitely need a guest account in your registration form. You can always let me know after registration whether you need one, including during the meeting. Guests must abide by the [https://vpnreg.ucs.ed.ac.uk/admin/compregs.pdf computing regulations].

* '''Visit-Ed.''' If eduroam does not work for you and you don't have a guest account, you can try using the [https://www.ed.ac.uk/information-services/computing/desktop-personal/wifi-networking/guest-alumni-wifi-access Visit-Ed service] described in the middle of that page. It requires registration by Facebook, LinkedIn, WhatsApp, or text message (international numbers included).

==== Workspace ====

A quiet area for shared use is available in the [https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.09 Porteous Room 1.09]
(you can read more about it
[https://exhibition.div.ed.ac.uk/porteous%E2%80%AFroom/ here]) on the
same floor as the main room.

== Travel ==

=== Travel to Edinburgh ===

==== Air ====

[https://www.edinburghairport.com/ Edinburgh Airport] is located
approximately 8 miles away from the city centre.

The [https://edinburghtrams.com/ Edinburgh tram] runs from the
airport every 7 minutes, the last tram from the airport leaves after
22:30 (see tram webpage).

The [https://airlink100.co.uk/ Airlink bus] (service 100) runs
between the airport and the city centre, reaching Waverley Bridge
railway station in 25 minutes. The route to and from the airport runs
24 hours a day every 10 minutes approximately during the day.

Most advance hire taxi companies will offer an airport pick-up
service. [https://www.taxis-edinburgh.co.uk/ Here's one], but any will
do. There's also a taxi hailing stand at the airport, follow the signs.

You can also fly into another main UK city and continue to Edinburgh by [[#Train|train]].

==== Train ====

Edinburgh is well-connected to most other main UK cities. There are a
few faster trains from London (about 4h25min) every day. You can use [https://www.nationalrail.co.uk/ National Rail] to plan your trip and link you to the appropriate provider.

I have enjoyed taking the Eurostar from the main continent to London. There is also the [https://www.sleeper.scot/ Caledonian Sleeper] that can get you to Edinburgh or London by 7am very slowly overnight.

=== Travel around Edinburgh ===

Edinburgh is somewhat hilly and the venue is located [https://upload.wikimedia.org/wikipedia/commons/f/ff/The_Mound%2C_Edinburgh%2C_18_September_2014.jpg up a slope].
If that is not a problem, then Edinburgh is quite walkable.

Public transportation is available. Check out [https://transportforedinburgh.com/ Transport for Edinburgh] for all the details.

* Buses. [https://www.lothianbuses.com/ Lothian buses] operates many of the relevant buses. You can pay contactless with a card or app and there's a capped pay program ('TapTapCap'). Here's the [https://www.lothianbuses.com/wp-content/uploads/2024/09/Network_Map_240908.pdf map], but I usually use Google maps for directions.

* Taxis. You can usually just hail a black cab from anywhere in the centre, see their [https://www.taxis-edinburgh.co.uk/ webpage] for advance bookings. Your favourite search engine will provide other taxi companies.

* Tram. The [https://edinburghtrams.com/ Edinburgh tram] stops fairly close to the venue, so can be an easy way to the venue.

* Uber operates in Edinburgh.

== Accommodation ==

The venue is located quite centrally, with many hotels nearby. Here are some 4-star and 3-star suggestions nearby, but you'll probably find something charming by your own (just watch out for scams). The tram and buses make it easy to also stay somewhere away from the centre and commute in if you prefer.

Hotel suggestions:
* [https://www.apexhotels.co.uk/destinations/edinburgh/apex-city-of-edinburgh-hotel/ Apex City of Edinburgh Hotel]. Main suggestion, slightly-up-and-steep-downhill from the venue. We have a 10% discount code, which I will email once I have it. '''Note:''' There is a slightly more full Apex hotel on the same street which I listed before, so if you want to be in the suggested hotel, make sure you're in the correct one.
* [https://www.motel-one.com/en/hotels/edinburgh/hotel-edinburgh-royal/ Motel One Edinburgh Royal]. A cheaper option, steep downhill from the venue.
* [https://www.scotsmanhotel.co.uk/ Scotsman Hotel]. A more expensive option, slightly-up-and-moderate-downhill from the venue.

== Weather ==

Edinburgh has temperate (and temperamental) climate, and currently the broadcast is 0 to 8 degrees centrigade during the day, and perhaps -1 degrees centrigade at night and in the early morning. It will be windy with gusts of wind of up to 35 mph, and potentially rainy, so make sure you dress appropriately. Locals wear waterproof/resistant clothes. Umbrellas tend to be rather useless due to the wind, one typically recognises the tourists by their futile struggles to turn inside-out umbrellas
while getting soaked.

The days are quite short in December, and you might be able to catch
the sunrise heading into the venue in the morning. I recommend
avoiding missing most of the daylight completely, e.g., make sure you go
for a short walk outside during the lunch break.

== Tourism ==

Edinburgh offers many tourist attractions and museums, and many are located centrally and close to the venue. Entrance to museums and galleries is free. Entrance to some exhibitions in the museum or gallery will require buying a separate ticket.

The meeting takes place just after [https://www.visitscotland.com/things-to-do/events/st-andrews-day Saint Andrew's Day] weekend, and Monday will be a public holiday in Scotland.
That should not affect travel, although the airport and railway might be busier than usual.

[https://www.historicenvironment.scot/about-us/news/st-andrews-day-ticket-giveaway/ Historic Environment Scotland] offer free tickets to visit some Historic Scotland attractions on Saint Andrew's day, such as the Edinburgh Castle. Registration for [https://www.historicenvironment.scot/ticket-giveaway/ free tourism tickets] opens Tuesday 12 November 10am UK time until Thursday 28 November.

If you go to the Castle, try to get there before 1pm to see them fire the Cannon.

Very near the venue is Scott Monument which you can climb, for a fee,
during the day for a stunning view. There will be a German Christmas
Market nearby I believe.

There are several hills within the city and you can easily climb up. The easiest (and closest to the venue) is [https://ewh.org.uk/calton-hill/ Calton Hill] and has a road and steps leading all the way up.

[https://www.geolsoc.org.uk/GeositesArthursSeat Arthur's Seat and the Salisbury Crags] are most visible from the centre. It takes about 1.5 hours roundtrip to get to the top. The grass can be slippery after a rain, and people can slip to their death, so wear good shoes and only climb during the day.

You can sometimes take a daytrip on a guided tour to the highlands or a whisky distillery. If you have the time, I recommend spending a few days in the former, and maybe visiting some of the latter.

I'll try to add more stuff here, especially if people send me recommendations or ask questions.

== Registration ==
Please register [https://www.epay.ed.ac.uk/conferences-and-events/college-of-science-and-engineering/school-of-informatics/informatics-events/ifip-working-group here].
After you 'Book Event', please choose either:
* '4 Day Attendee' or
* iff you're only attending partially, tick the boxes for the relevant days.

(If you plan to partially attend, please discuss with the Chairs first. I think it's somewhat unusual.)

You'll be prompted for additional details like contact details, allergies and dietary requirements after: adding to basket; proceeding to checkout; registering.

Please let me know if you have any problems. Please let me know if you won't be able to register before Thursday 28 Nov.

== Attendance ==
(Alphabetical by last name please)

* Guillaume Allais
* Nada Amin
* Sandrine Blazy
* Edwin Brady
* Jacques Carette
* Sebastian Erdweg
* Jeremy Gibbons
* Kevin Hammond
* Ohad Kammar
* Paul Kelly (on 5-6 only)
* Andras Kovacs
* Lindsey Kuper
* Julia Lawall
* Ralf Lämmel
* Sam Lindley
* James McKinna
* Peter Mosses
* Christoph Reichenbach
* Tiark Rompf
* Sven-Bodo Scholz
* Amir Shaikhha
* Friedrich Steimann
* Jeremy Yallop

=== Local Observers ===
* Greg Brown
* Justus Matthiesen
* Nachiappan Valliappan
* Robert Wright

== Talks ==

See below for the schedule (but note that the actual scheduling of talks will not be available until the meeting starts). Members: please add yourself and your topic, alphabetically ordered by surname:
| Scoped and Typed Staging by Evaluation
* Guillaume Allais [[WG211/M24Allais | Scoped and Typed Staging by Evaluation ]]
* Nada Amin [[WG211/M24Amin | Verified program synthesis ]]
* Sandrine Blazy [[WG211/M24Blazy | A Mechanized Semantics for Dataflow Circuits ]]
* Edwin Brady [[WG211/M24Brady | "Normalisation by Compilation": Typechecking Dependent Types via the Scheme Runtime ]]
* Jacques Carette [[WG211/M24Carette | Partial Evaluation meets Denotational Semantics ]]
* Sebastian Erdweg [[WG211/M24Erdweg | Stateful Differential Operators for Incremental Computing ]]
* Jeremy Gibbons [[WG211/M24Gibbons | Continuation−Passing Style‚ Defunctionalization‚ Accumulations‚ and Associativity ]]
* Kevin Hammond [[WG211/M24Hammond | Using Formal Methods at Scale in the Delivery of a High Assurance Distributed System: the Cardano Blockchain Implementation in Haskell ]]
* Andras Kovacs [[WG211/M24Kovacs | Runtime code generation with dependent types ]]
* Lindsey Kuper [[WG211/M24Kuper | Library-Level Choreographic Programming ]]
* Ralf Lämmel [[WG211/M24Laemmel | Type Inference in a Knowledge-Graph Setting]]
* Sam Lindley [[ WG211M24Lindley | Modal Effect Types ]]
* Peter Mosses [[ WG211/M24Mosses | Denotational Semantics in Agda ]]
* Christoph Reichenbach [[ WG211/M23Reichenbach | Circular Attribute Evaluation in Reference Attribute Grammars ]]
* Tiark Rompf [[WG211/M24Rompf | Rhyme: A Data-Centric Multi-Paradigm Query Language ]]
* Amir Shaikhha [[ WG211M24Shaikhha | Democratizing Data Science by Leveraging Structure ]]
* Friedrich Steimann [[ WG211/M24Steimann | A really old new metatheory of software languages ]]

We will follow our usual format of interactive talks with an active audience, using a chess clock for timing, as follows. For each talk the speaker and the audience each get at most 25 minutes. The audience does not have to wait until the end of a talk to ask questions; interaction and discussion is encouraged. (But experience from previous meetings shows that it is useful to let the speaker at least finish the introduction before interrupting.) To ensure fairness, administration of the time used by each party is done using a chess clock. Operation of the clock rotates among participants. Both speaker and audience are expected to contribute to make talks and discussions engaging, interesting, and useful. Therefore, we observe a policy of no use of electronic devices during talks (other than the device the speaker uses to present slides). Bring paper and pen for making notes.

== Program / schedule ==

=== Scientific program ===

Updated nightly for the following day.

Tuesday, December 3

* 08:45 - 09:05 Assemble and welcome
** 09:05 - 09:55 Talk 01
** 09:55 - 10:45 Talk 02
* 10:45 - 11:15 Coffee break
** 11:15 - 12:05 Talk 03
* 12:05 - 14:00 Lunch and break
** 14:00 - 14:50 Talk 04
** 14:50 - 15:40 Talk 05
* 15:40 - 16:10 Coffee break
** 16:10 - 17:00 Talk 06

* 19:00 Dinner: David Bann

Wednesday, December 4

Note: if you're planning to walk to the Galleries today, bring comfortable shoes and relatively warm clothes.

* 09:45 - 09:05 Assemble and welcome
** 09:05 - 09:55 Talk 07
** 09:55 - 10:45 Talk 08
* 10:45 - 11:15 Coffee break
** 11:15 - 12:05 Talk 09
* 12:05 - 13:00 Lunch and short break
* 13:00 onwards: afternoon excursion to the Modern Art Galleries

* 19:00 Dinner: Wee Greek Kitchen

Thursday, December 5

* 08:45 - 09:05 Assemble and welcome
** 09:05 - 09:55 Talk 10
** 09:55 - 10:45 Talk 11
* 10:45 - 11:15 Coffee break
** 11:15 - 12:05 Talk 12
* 12:05 - 14:00 Lunch and break
** 14:00 - 14:50 Talk 13
** 14:50 - 15:40 Talk 14
* 15:40 - 17:00 Coffee break transitioning into business meeting

* 20:30 Dinner: Howie's at Waterloo Place

Friday, December 6

* 09:45 - 09:05 Assemble and welcome
** 09:05 - 09:55 Talk 15
** 09:55 - 10:45 Talk 16
* 10:45 - 11:15 Coffee break
** 11:15 - 12:05 Talk 17
* 12:05 - 13:00 Lunch and farewell

=== Social events ===

To be determined.

WG211/M24Schedule

2024-11-28T19:06:37Z

Jacques: Ordering

= IFIP Working Group 2.11, Twenty-fourth Meeting =

== December 3rd (Tues) - 6th (Fri) in Edinburgh, Scotland, UK ==

The meeting will be hosted by [https://www.denotational.co.uk/ Ohad Kammar], who will write in the first person in the remainder. If you want to know anything, please email me. This page is not yet finished, I'll try to add the missing information as soon as possible.

The meeting will last 3.5 days; the first three days (Tues-Thur) will
be full-day whereas the last day (Fri) will be a half-day session.

=== Venue ===

[https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.07 Althaus-Reid Room, 1.07] ([http://exhibition.div.ed.ac.uk/rooms-renamed-in-honour-of-two-inspirational-female-theologians/ named after the theologian Marcella Althaus-Reid])

New College 
School of Divinity 
The University of Edinburgh 
Central Campus 
1 Mound Place 
Edinburgh EH1 2LU

This is unfortunately '''not''' the School of Informatics, which is about 15 minutes walk south from this venue.

A [https://maps.app.goo.gl/oCXGNCb2ax68WS6B6/ Google map] with the venue, hotels, and meeting-relevant locations.

==== WiFi Access ====

* '''eduroam.''' If you have eduroam credentials, you may use them to access the eduroam network while at Edinburgh.

* '''guest account.''' If you know that eduroam will not work for you, I can set you up with a guest account. Please indicate that you will definitely need a guest account in your registration form. You can always let me know after registration whether you need one, including during the meeting. Guests must abide by the [https://vpnreg.ucs.ed.ac.uk/admin/compregs.pdf computing regulations].

* '''Visit-Ed.''' If eduroam does not work for you and you don't have a guest account, you can try using the [https://www.ed.ac.uk/information-services/computing/desktop-personal/wifi-networking/guest-alumni-wifi-access Visit-Ed service] described in the middle of that page. It requires registration by Facebook, LinkedIn, WhatsApp, or text message (international numbers included).

==== Workspace ====

A quiet area for shared use is available in the [https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.09 Porteous Room 1.09]
(you can read more about it
[https://exhibition.div.ed.ac.uk/porteous%E2%80%AFroom/ here]) on the
same floor as the main room.

== Travel ==

=== Travel to Edinburgh ===

==== Air ====

[https://www.edinburghairport.com/ Edinburgh Airport] is located
approximately 8 miles away from the city centre.

The [https://edinburghtrams.com/ Edinburgh tram] runs from the
airport every 7 minutes, the last tram from the airport leaves after
22:30 (see tram webpage).

The [https://airlink100.co.uk/ Airlink bus] (service 100) runs
between the airport and the city centre, reaching Waverley Bridge
railway station in 25 minutes. The route to and from the airport runs
24 hours a day every 10 minutes approximately during the day.

Most advance hire taxi companies will offer an airport pick-up
service. [https://www.taxis-edinburgh.co.uk/ Here's one], but any will
do. There's also a taxi hailing stand at the airport, follow the signs.

You can also fly into another main UK city and continue to Edinburgh by [[#Train|train]].

==== Train ====

Edinburgh is well-connected to most other main UK cities. There are a
few faster trains from London (about 4h25min) every day. You can use [https://www.nationalrail.co.uk/ National Rail] to plan your trip and link you to the appropriate provider.

I have enjoyed taking the Eurostar from the main continent to London. There is also the [https://www.sleeper.scot/ Caledonian Sleeper] that can get you to Edinburgh or London by 7am very slowly overnight.

=== Travel around Edinburgh ===

Edinburgh is somewhat hilly and the venue is located [https://upload.wikimedia.org/wikipedia/commons/f/ff/The_Mound%2C_Edinburgh%2C_18_September_2014.jpg up a slope].
If that is not a problem, then Edinburgh is quite walkable.

Public transportation is available. Check out [https://transportforedinburgh.com/ Transport for Edinburgh] for all the details.

* Buses. [https://www.lothianbuses.com/ Lothian buses] operates many of the relevant buses. You can pay contactless with a card or app and there's a capped pay program ('TapTapCap'). Here's the [https://www.lothianbuses.com/wp-content/uploads/2024/09/Network_Map_240908.pdf map], but I usually use Google maps for directions.

* Taxis. You can usually just hail a black cab from anywhere in the centre, see their [https://www.taxis-edinburgh.co.uk/ webpage] for advance bookings. Your favourite search engine will provide other taxi companies.

* Tram. The [https://edinburghtrams.com/ Edinburgh tram] stops fairly close to the venue, so can be an easy way to the venue.

* Uber operates in Edinburgh.

== Accommodation ==

The venue is located quite centrally, with many hotels nearby. Here are some 4-star and 3-star suggestions nearby, but you'll probably find something charming by your own (just watch out for scams). The tram and buses make it easy to also stay somewhere away from the centre and commute in if you prefer.

Hotel suggestions:
* [https://www.apexhotels.co.uk/destinations/edinburgh/apex-city-of-edinburgh-hotel/ Apex City of Edinburgh Hotel]. Main suggestion, slightly-up-and-steep-downhill from the venue. We have a 10% discount code, which I will email once I have it. '''Note:''' There is a slightly more full Apex hotel on the same street which I listed before, so if you want to be in the suggested hotel, make sure you're in the correct one.
* [https://www.motel-one.com/en/hotels/edinburgh/hotel-edinburgh-royal/ Motel One Edinburgh Royal]. A cheaper option, steep downhill from the venue.
* [https://www.scotsmanhotel.co.uk/ Scotsman Hotel]. A more expensive option, slightly-up-and-moderate-downhill from the venue.

== Weather ==

Edinburgh has temperate (and temperamental) climate, and in December it will likely be close to zero degrees centrigade, typically above. It will be windy, and potentially rainy, so make sure you dress appropriately. Locals wear waterproof/resistant clothes. Umbrellas tend to be rather useless due to the wind, one typically recognises the tourists by their futile struggles to turn inside-out umbrellas
while getting soaked.

The days are quite short in December, and you might be able to catch
the sunrise heading into the venue in the morning. I recommend
avoiding missing most of the daylight completely, e.g., make sure you go
for a short walk outside during the lunch break.

== Tourism ==

Edinburgh offers many tourist attractions and museums, and many are located centrally and close to the venue. Entrance to museums and galleries is free. Entrance to some exhibitions in the museum or gallery will require buying a separate ticket.

The meeting takes place just after [https://www.visitscotland.com/things-to-do/events/st-andrews-day Saint Andrew's Day] weekend, and Monday will be a public holiday in Scotland.
That should not affect travel, although the airport and railway might be busier than usual.

[https://www.historicenvironment.scot/about-us/news/st-andrews-day-ticket-giveaway/ Historic Environment Scotland] offer free tickets to visit some Historic Scotland attractions on Saint Andrew's day, such as the Edinburgh Castle. Registration for [https://www.historicenvironment.scot/ticket-giveaway/ free tourism tickets] opens Tuesday 12 November 10am UK time until Thursday 28 November.

If you go to the Castle, try to get there before 1pm to see them fire the Cannon.

Very near the venue is Scott Monument which you can climb, for a fee,
during the day for a stunning view. There will be a German Christmas
Market nearby I believe.

There are several hills within the city and you can easily climb up. The easiest (and closest to the venue) is [https://ewh.org.uk/calton-hill/ Calton Hill] and has a road and steps leading all the way up.

[https://www.geolsoc.org.uk/GeositesArthursSeat Arthur's Seat and the Salisbury Crags] are most visible from the centre. It takes about 1.5 hours roundtrip to get to the top. The grass can be slippery after a rain, and people can slip to their death, so wear good shoes and only climb during the day.

You can sometimes take a daytrip on a guided tour to the highlands or a whisky distillery. If you have the time, I recommend spending a few days in the former, and maybe visiting some of the latter.

I'll try to add more stuff here, especially if people send me recommendations or ask questions.

== Registration ==
Please register [https://www.epay.ed.ac.uk/conferences-and-events/college-of-science-and-engineering/school-of-informatics/informatics-events/ifip-working-group here].
After you 'Book Event', please choose either:
* '4 Day Attendee' or
* iff you're only attending partially, tick the boxes for the relevant days.

(If you plan to partially attend, please discuss with the Chairs first. I think it's somewhat unusual.)

You'll be prompted for additional details like contact details, allergies and dietary requirements after: adding to basket; proceeding to checkout; registering.

Please let me know if you have any problems. Please let me know if you won't be able to register before Thursday 28 Nov.

== Attendance ==
(Alphabetical by last name please)

* Guillaume Allais
* Nada Amin
* Sandrine Blazy
* Edwin Brady
* Jacques Carette
* Sebastian Erdweg
* Jeremy Gibbons
* Kevin Hammond
* Ohad Kammar
* Paul Kelly (on 5-6 only)
* Andras Kovacs
* Lindsey Kuper
* Julia Lawall
* Ralf Lämmel
* Sam Lindley
* James McKinna
* Peter Mosses
* Christoph Reichenbach
* Tiark Rompf
* Sven-Bodo Scholz
* Amir Shaikhha
* Friedrich Steimann
* Jeremy Yallop

=== Local Observers ===
* Robert Wright

== Talks ==

See below for the schedule (but note that the actual scheduling of talks will not be available until the meeting starts). Members: please add yourself and your topic, alphabetically ordered by surname:

* Nada Amin [[WG211/M24Amin | Verified program synthesis ]]
* Sandrine Blazy [[WG211/M24Blazy | A Mechanized Semantics for Dataflow Circuits ]]
* Edwin Brady [[WG211/M24Brady | "Normalisation by Compilation": Typechecking Dependent Types via the Scheme Runtime ]]
* Jacques Carette [[WG211/M24Carette | Partial Evaluation meets Denotational Semantics ]]
* Sebastian Erdweg [[WG211/M24Erdweg | Stateful Differential Operators for Incremental Computing ]]
* Jeremy Gibbons [[WG211/M24Gibbons | Continuation−Passing Style‚ Defunctionalization‚ Accumulations‚ and Associativity ]]
* Kevin Hammond [[WG211/M24Hammond | Using Formal Methods at Scale in the Delivery of a High Assurance Distributed System: the Cardano Blockchain Implementation in Haskell ]]
* Andras Kovacs [[WG211/M24Kovacs | Runtime code generation with dependent types ]]
* Lindsey Kuper [[WG211/M24Kuper | Library-Level Choreographic Programming ]]
* Ralf Lämmel [[WG211/M24Laemmel | Type Inference in a Knowledge-Graph Setting]]
* Sam Lindley [[ WG211M24Lindley | Modal Effect Types ]]
* Peter Mosses [[ WG211/M24Mosses | Denotational Semantics in Agda ]]
* Tiark Rompf [[WG211/M24Rompf | Rhyme: A Data-Centric Multi-Paradigm Query Language ]]
* Amir Shaikhha [[ WG211M24Shaikhha | Democratizing Data Science by Leveraging Structure ]]
* Friedrich Steimann [[ WG211/M24Steimann | A really old new metatheory of software languages ]]

We will follow our usual format of interactive talks with an active audience, using a chess clock for timing, as follows. For each talk the speaker and the audience each get at most 25 minutes. The audience does not have to wait until the end of a talk to ask questions; interaction and discussion is encouraged. (But experience from previous meetings shows that it is useful to let the speaker at least finish the introduction before interrupting.) To ensure fairness, administration of the time used by each party is done using a chess clock. Operation of the clock rotates among participants. Both speaker and audience are expected to contribute to make talks and discussions engaging, interesting, and useful. Therefore, we observe a policy of no use of electronic devices during talks (other than the device the speaker uses to present slides). Bring paper and pen for making notes.

== Program / schedule ==

=== Scientific program ===

To be determined.

Tuesday, December 3

* 8:45 - 9:00 Welcome
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Break
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Lunch
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>>

Wednesday, December 4

* 9:00 - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Break
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Lunch
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>>

Thursday, December 5

* 9:00 - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Break
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Lunch
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>>

Friday, December 6

* 9:00 - <<TBD>> <<n>> talks
** <<TBD>>-<<TBD>> <<TBD>>
* <<TBD>> - <<TBD>> Break
* <<TBD>> - <<TBD>> 1 talk
* <<TBD>> Lunch

=== Social events ===

To be determined.

WG211/M24Schedule

2024-11-28T19:06:08Z

Jacques: /* Attendance */

= IFIP Working Group 2.11, Twenty-fourth Meeting =

== December 3rd (Tues) - 6th (Fri) in Edinburgh, Scotland, UK ==

The meeting will be hosted by [https://www.denotational.co.uk/ Ohad Kammar], who will write in the first person in the remainder. If you want to know anything, please email me. This page is not yet finished, I'll try to add the missing information as soon as possible.

The meeting will last 3.5 days; the first three days (Tues-Thur) will
be full-day whereas the last day (Fri) will be a half-day session.

=== Venue ===

[https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.07 Althaus-Reid Room, 1.07] ([http://exhibition.div.ed.ac.uk/rooms-renamed-in-honour-of-two-inspirational-female-theologians/ named after the theologian Marcella Althaus-Reid])

New College 
School of Divinity 
The University of Edinburgh 
Central Campus 
1 Mound Place 
Edinburgh EH1 2LU

This is unfortunately '''not''' the School of Informatics, which is about 15 minutes walk south from this venue.

A [https://maps.app.goo.gl/oCXGNCb2ax68WS6B6/ Google map] with the venue, hotels, and meeting-relevant locations.

==== WiFi Access ====

* '''eduroam.''' If you have eduroam credentials, you may use them to access the eduroam network while at Edinburgh.

* '''guest account.''' If you know that eduroam will not work for you, I can set you up with a guest account. Please indicate that you will definitely need a guest account in your registration form. You can always let me know after registration whether you need one, including during the meeting. Guests must abide by the [https://vpnreg.ucs.ed.ac.uk/admin/compregs.pdf computing regulations].

* '''Visit-Ed.''' If eduroam does not work for you and you don't have a guest account, you can try using the [https://www.ed.ac.uk/information-services/computing/desktop-personal/wifi-networking/guest-alumni-wifi-access Visit-Ed service] described in the middle of that page. It requires registration by Facebook, LinkedIn, WhatsApp, or text message (international numbers included).

==== Workspace ====

A quiet area for shared use is available in the [https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.09 Porteous Room 1.09]
(you can read more about it
[https://exhibition.div.ed.ac.uk/porteous%E2%80%AFroom/ here]) on the
same floor as the main room.

== Travel ==

=== Travel to Edinburgh ===

==== Air ====

[https://www.edinburghairport.com/ Edinburgh Airport] is located
approximately 8 miles away from the city centre.

The [https://edinburghtrams.com/ Edinburgh tram] runs from the
airport every 7 minutes, the last tram from the airport leaves after
22:30 (see tram webpage).

The [https://airlink100.co.uk/ Airlink bus] (service 100) runs
between the airport and the city centre, reaching Waverley Bridge
railway station in 25 minutes. The route to and from the airport runs
24 hours a day every 10 minutes approximately during the day.

Most advance hire taxi companies will offer an airport pick-up
service. [https://www.taxis-edinburgh.co.uk/ Here's one], but any will
do. There's also a taxi hailing stand at the airport, follow the signs.

You can also fly into another main UK city and continue to Edinburgh by [[#Train|train]].

==== Train ====

Edinburgh is well-connected to most other main UK cities. There are a
few faster trains from London (about 4h25min) every day. You can use [https://www.nationalrail.co.uk/ National Rail] to plan your trip and link you to the appropriate provider.

I have enjoyed taking the Eurostar from the main continent to London. There is also the [https://www.sleeper.scot/ Caledonian Sleeper] that can get you to Edinburgh or London by 7am very slowly overnight.

=== Travel around Edinburgh ===

Edinburgh is somewhat hilly and the venue is located [https://upload.wikimedia.org/wikipedia/commons/f/ff/The_Mound%2C_Edinburgh%2C_18_September_2014.jpg up a slope].
If that is not a problem, then Edinburgh is quite walkable.

Public transportation is available. Check out [https://transportforedinburgh.com/ Transport for Edinburgh] for all the details.

* Buses. [https://www.lothianbuses.com/ Lothian buses] operates many of the relevant buses. You can pay contactless with a card or app and there's a capped pay program ('TapTapCap'). Here's the [https://www.lothianbuses.com/wp-content/uploads/2024/09/Network_Map_240908.pdf map], but I usually use Google maps for directions.

* Taxis. You can usually just hail a black cab from anywhere in the centre, see their [https://www.taxis-edinburgh.co.uk/ webpage] for advance bookings. Your favourite search engine will provide other taxi companies.

* Tram. The [https://edinburghtrams.com/ Edinburgh tram] stops fairly close to the venue, so can be an easy way to the venue.

* Uber operates in Edinburgh.

== Accommodation ==

The venue is located quite centrally, with many hotels nearby. Here are some 4-star and 3-star suggestions nearby, but you'll probably find something charming by your own (just watch out for scams). The tram and buses make it easy to also stay somewhere away from the centre and commute in if you prefer.

Hotel suggestions:
* [https://www.apexhotels.co.uk/destinations/edinburgh/apex-city-of-edinburgh-hotel/ Apex City of Edinburgh Hotel]. Main suggestion, slightly-up-and-steep-downhill from the venue. We have a 10% discount code, which I will email once I have it. '''Note:''' There is a slightly more full Apex hotel on the same street which I listed before, so if you want to be in the suggested hotel, make sure you're in the correct one.
* [https://www.motel-one.com/en/hotels/edinburgh/hotel-edinburgh-royal/ Motel One Edinburgh Royal]. A cheaper option, steep downhill from the venue.
* [https://www.scotsmanhotel.co.uk/ Scotsman Hotel]. A more expensive option, slightly-up-and-moderate-downhill from the venue.

== Weather ==

Edinburgh has temperate (and temperamental) climate, and in December it will likely be close to zero degrees centrigade, typically above. It will be windy, and potentially rainy, so make sure you dress appropriately. Locals wear waterproof/resistant clothes. Umbrellas tend to be rather useless due to the wind, one typically recognises the tourists by their futile struggles to turn inside-out umbrellas
while getting soaked.

The days are quite short in December, and you might be able to catch
the sunrise heading into the venue in the morning. I recommend
avoiding missing most of the daylight completely, e.g., make sure you go
for a short walk outside during the lunch break.

== Tourism ==

Edinburgh offers many tourist attractions and museums, and many are located centrally and close to the venue. Entrance to museums and galleries is free. Entrance to some exhibitions in the museum or gallery will require buying a separate ticket.

The meeting takes place just after [https://www.visitscotland.com/things-to-do/events/st-andrews-day Saint Andrew's Day] weekend, and Monday will be a public holiday in Scotland.
That should not affect travel, although the airport and railway might be busier than usual.

[https://www.historicenvironment.scot/about-us/news/st-andrews-day-ticket-giveaway/ Historic Environment Scotland] offer free tickets to visit some Historic Scotland attractions on Saint Andrew's day, such as the Edinburgh Castle. Registration for [https://www.historicenvironment.scot/ticket-giveaway/ free tourism tickets] opens Tuesday 12 November 10am UK time until Thursday 28 November.

If you go to the Castle, try to get there before 1pm to see them fire the Cannon.

Very near the venue is Scott Monument which you can climb, for a fee,
during the day for a stunning view. There will be a German Christmas
Market nearby I believe.

There are several hills within the city and you can easily climb up. The easiest (and closest to the venue) is [https://ewh.org.uk/calton-hill/ Calton Hill] and has a road and steps leading all the way up.

[https://www.geolsoc.org.uk/GeositesArthursSeat Arthur's Seat and the Salisbury Crags] are most visible from the centre. It takes about 1.5 hours roundtrip to get to the top. The grass can be slippery after a rain, and people can slip to their death, so wear good shoes and only climb during the day.

You can sometimes take a daytrip on a guided tour to the highlands or a whisky distillery. If you have the time, I recommend spending a few days in the former, and maybe visiting some of the latter.

I'll try to add more stuff here, especially if people send me recommendations or ask questions.

== Registration ==
Please register [https://www.epay.ed.ac.uk/conferences-and-events/college-of-science-and-engineering/school-of-informatics/informatics-events/ifip-working-group here].
After you 'Book Event', please choose either:
* '4 Day Attendee' or
* iff you're only attending partially, tick the boxes for the relevant days.

(If you plan to partially attend, please discuss with the Chairs first. I think it's somewhat unusual.)

You'll be prompted for additional details like contact details, allergies and dietary requirements after: adding to basket; proceeding to checkout; registering.

Please let me know if you have any problems. Please let me know if you won't be able to register before Thursday 28 Nov.

== Attendance ==
(Alphabetical by last name please)

* Guillaume Allais
* Nada Amin
* Sandrine Blazy
* Edwin Brady
* Jacques Carette
* Sebastian Erdweg
* Jeremy Gibbons
* Kevin Hammond
* Ohad Kammar
* Paul Kelly (on 5-6 only)
* Andras Kovacs
* Lindsey Kuper
* Julia Lawall
* Ralf Lämmel
* Sam Lindley
* James McKinna
* Peter Mosses
* Christoph Reichenbach
* Tiark Rompf
* Sven-Bodo Scholz
* Amir Shaikhha
* Friedrich Steimann
* Jeremy Yallop

=== Local Observers ===
* Robert Wright

== Talks ==

See below for the schedule (but note that the actual scheduling of talks will not be available until the meeting starts). Members: please add yourself and your topic, alphabetically ordered by surname:

* Nada Amin [[WG211/M24Amin | Verified program synthesis ]]
* Sandrine Blazy [[WG211/M24Blazy | A Mechanized Semantics for Dataflow Circuits ]]
* Edwin Brady [[WG211/M24Brady | "Normalisation by Compilation": Typechecking Dependent Types via the Scheme Runtime ]]
* Jacques Carette [[WG211/M24Carette | Partial Evaluation meets Denotational Semantics ]]
* Sebastian Erdweg [[WG211/M24Erdweg | Stateful Differential Operators for Incremental Computing ]]
* Jeremy Gibbons [[WG211/M24Gibbons | Continuation−Passing Style‚ Defunctionalization‚ Accumulations‚ and Associativity ]]
* Kevin Hammond [[WG211/M24Hammond | Using Formal Methods at Scale in the Delivery of a High Assurance Distributed System: the Cardano Blockchain Implementation in Haskell ]]
* Andras Kovacs [[WG211/M24Kovacs | Runtime code generation with dependent types ]]
* Lindsey Kuper [[WG211/M24Kuper | Library-Level Choreographic Programming ]]
* Ralf Lämmel [[WG211/M24Laemmel | Type Inference in a Knowledge-Graph Setting]]
* Sam Lindley [[ WG211M24Lindley | Modal Effect Types ]]
* Peter Mosses [[ WG211/M24Mosses | Denotational Semantics in Agda ]]
* Tiark Rompf [[WG211/M24Rompf | Rhyme: A Data-Centric Multi-Paradigm Query Language ]]
* Friedrich Steimann [[ WG211/M24Steimann | A really old new metatheory of software languages ]]
* Amir Shaikhha [[ WG211M24Shaikhha | Democratizing Data Science by Leveraging Structure ]]

We will follow our usual format of interactive talks with an active audience, using a chess clock for timing, as follows. For each talk the speaker and the audience each get at most 25 minutes. The audience does not have to wait until the end of a talk to ask questions; interaction and discussion is encouraged. (But experience from previous meetings shows that it is useful to let the speaker at least finish the introduction before interrupting.) To ensure fairness, administration of the time used by each party is done using a chess clock. Operation of the clock rotates among participants. Both speaker and audience are expected to contribute to make talks and discussions engaging, interesting, and useful. Therefore, we observe a policy of no use of electronic devices during talks (other than the device the speaker uses to present slides). Bring paper and pen for making notes.

== Program / schedule ==

=== Scientific program ===

To be determined.

Tuesday, December 3

* 8:45 - 9:00 Welcome
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Break
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Lunch
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>>

Wednesday, December 4

* 9:00 - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Break
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Lunch
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>>

Thursday, December 5

* 9:00 - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Break
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Lunch
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>>

Friday, December 6

* 9:00 - <<TBD>> <<n>> talks
** <<TBD>>-<<TBD>> <<TBD>>
* <<TBD>> - <<TBD>> Break
* <<TBD>> - <<TBD>> 1 talk
* <<TBD>> Lunch

=== Social events ===

To be determined.

WG211/M24Schedule

2024-11-28T19:04:38Z

Jacques: Ordering

= IFIP Working Group 2.11, Twenty-fourth Meeting =

== December 3rd (Tues) - 6th (Fri) in Edinburgh, Scotland, UK ==

The meeting will be hosted by [https://www.denotational.co.uk/ Ohad Kammar], who will write in the first person in the remainder. If you want to know anything, please email me. This page is not yet finished, I'll try to add the missing information as soon as possible.

The meeting will last 3.5 days; the first three days (Tues-Thur) will
be full-day whereas the last day (Fri) will be a half-day session.

=== Venue ===

[https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.07 Althaus-Reid Room, 1.07] ([http://exhibition.div.ed.ac.uk/rooms-renamed-in-honour-of-two-inspirational-female-theologians/ named after the theologian Marcella Althaus-Reid])

New College 
School of Divinity 
The University of Edinburgh 
Central Campus 
1 Mound Place 
Edinburgh EH1 2LU

This is unfortunately '''not''' the School of Informatics, which is about 15 minutes walk south from this venue.

A [https://maps.app.goo.gl/oCXGNCb2ax68WS6B6/ Google map] with the venue, hotels, and meeting-relevant locations.

==== WiFi Access ====

* '''eduroam.''' If you have eduroam credentials, you may use them to access the eduroam network while at Edinburgh.

* '''guest account.''' If you know that eduroam will not work for you, I can set you up with a guest account. Please indicate that you will definitely need a guest account in your registration form. You can always let me know after registration whether you need one, including during the meeting. Guests must abide by the [https://vpnreg.ucs.ed.ac.uk/admin/compregs.pdf computing regulations].

* '''Visit-Ed.''' If eduroam does not work for you and you don't have a guest account, you can try using the [https://www.ed.ac.uk/information-services/computing/desktop-personal/wifi-networking/guest-alumni-wifi-access Visit-Ed service] described in the middle of that page. It requires registration by Facebook, LinkedIn, WhatsApp, or text message (international numbers included).

==== Workspace ====

A quiet area for shared use is available in the [https://www.ed.ac.uk/timetabling-examinations/timetabling/room-bookings/bookable-rooms3/room/0401_01_1.09 Porteous Room 1.09]
(you can read more about it
[https://exhibition.div.ed.ac.uk/porteous%E2%80%AFroom/ here]) on the
same floor as the main room.

== Travel ==

=== Travel to Edinburgh ===

==== Air ====

[https://www.edinburghairport.com/ Edinburgh Airport] is located
approximately 8 miles away from the city centre.

The [https://edinburghtrams.com/ Edinburgh tram] runs from the
airport every 7 minutes, the last tram from the airport leaves after
22:30 (see tram webpage).

The [https://airlink100.co.uk/ Airlink bus] (service 100) runs
between the airport and the city centre, reaching Waverley Bridge
railway station in 25 minutes. The route to and from the airport runs
24 hours a day every 10 minutes approximately during the day.

Most advance hire taxi companies will offer an airport pick-up
service. [https://www.taxis-edinburgh.co.uk/ Here's one], but any will
do. There's also a taxi hailing stand at the airport, follow the signs.

You can also fly into another main UK city and continue to Edinburgh by [[#Train|train]].

==== Train ====

Edinburgh is well-connected to most other main UK cities. There are a
few faster trains from London (about 4h25min) every day. You can use [https://www.nationalrail.co.uk/ National Rail] to plan your trip and link you to the appropriate provider.

I have enjoyed taking the Eurostar from the main continent to London. There is also the [https://www.sleeper.scot/ Caledonian Sleeper] that can get you to Edinburgh or London by 7am very slowly overnight.

=== Travel around Edinburgh ===

Edinburgh is somewhat hilly and the venue is located [https://upload.wikimedia.org/wikipedia/commons/f/ff/The_Mound%2C_Edinburgh%2C_18_September_2014.jpg up a slope].
If that is not a problem, then Edinburgh is quite walkable.

Public transportation is available. Check out [https://transportforedinburgh.com/ Transport for Edinburgh] for all the details.

* Buses. [https://www.lothianbuses.com/ Lothian buses] operates many of the relevant buses. You can pay contactless with a card or app and there's a capped pay program ('TapTapCap'). Here's the [https://www.lothianbuses.com/wp-content/uploads/2024/09/Network_Map_240908.pdf map], but I usually use Google maps for directions.

* Taxis. You can usually just hail a black cab from anywhere in the centre, see their [https://www.taxis-edinburgh.co.uk/ webpage] for advance bookings. Your favourite search engine will provide other taxi companies.

* Tram. The [https://edinburghtrams.com/ Edinburgh tram] stops fairly close to the venue, so can be an easy way to the venue.

* Uber operates in Edinburgh.

== Accommodation ==

The venue is located quite centrally, with many hotels nearby. Here are some 4-star and 3-star suggestions nearby, but you'll probably find something charming by your own (just watch out for scams). The tram and buses make it easy to also stay somewhere away from the centre and commute in if you prefer.

Hotel suggestions:
* [https://www.apexhotels.co.uk/destinations/edinburgh/apex-city-of-edinburgh-hotel/ Apex City of Edinburgh Hotel]. Main suggestion, slightly-up-and-steep-downhill from the venue. We have a 10% discount code, which I will email once I have it. '''Note:''' There is a slightly more full Apex hotel on the same street which I listed before, so if you want to be in the suggested hotel, make sure you're in the correct one.
* [https://www.motel-one.com/en/hotels/edinburgh/hotel-edinburgh-royal/ Motel One Edinburgh Royal]. A cheaper option, steep downhill from the venue.
* [https://www.scotsmanhotel.co.uk/ Scotsman Hotel]. A more expensive option, slightly-up-and-moderate-downhill from the venue.

== Weather ==

Edinburgh has temperate (and temperamental) climate, and in December it will likely be close to zero degrees centrigade, typically above. It will be windy, and potentially rainy, so make sure you dress appropriately. Locals wear waterproof/resistant clothes. Umbrellas tend to be rather useless due to the wind, one typically recognises the tourists by their futile struggles to turn inside-out umbrellas
while getting soaked.

The days are quite short in December, and you might be able to catch
the sunrise heading into the venue in the morning. I recommend
avoiding missing most of the daylight completely, e.g., make sure you go
for a short walk outside during the lunch break.

== Tourism ==

Edinburgh offers many tourist attractions and museums, and many are located centrally and close to the venue. Entrance to museums and galleries is free. Entrance to some exhibitions in the museum or gallery will require buying a separate ticket.

The meeting takes place just after [https://www.visitscotland.com/things-to-do/events/st-andrews-day Saint Andrew's Day] weekend, and Monday will be a public holiday in Scotland.
That should not affect travel, although the airport and railway might be busier than usual.

[https://www.historicenvironment.scot/about-us/news/st-andrews-day-ticket-giveaway/ Historic Environment Scotland] offer free tickets to visit some Historic Scotland attractions on Saint Andrew's day, such as the Edinburgh Castle. Registration for [https://www.historicenvironment.scot/ticket-giveaway/ free tourism tickets] opens Tuesday 12 November 10am UK time until Thursday 28 November.

If you go to the Castle, try to get there before 1pm to see them fire the Cannon.

Very near the venue is Scott Monument which you can climb, for a fee,
during the day for a stunning view. There will be a German Christmas
Market nearby I believe.

There are several hills within the city and you can easily climb up. The easiest (and closest to the venue) is [https://ewh.org.uk/calton-hill/ Calton Hill] and has a road and steps leading all the way up.

[https://www.geolsoc.org.uk/GeositesArthursSeat Arthur's Seat and the Salisbury Crags] are most visible from the centre. It takes about 1.5 hours roundtrip to get to the top. The grass can be slippery after a rain, and people can slip to their death, so wear good shoes and only climb during the day.

You can sometimes take a daytrip on a guided tour to the highlands or a whisky distillery. If you have the time, I recommend spending a few days in the former, and maybe visiting some of the latter.

I'll try to add more stuff here, especially if people send me recommendations or ask questions.

== Registration ==
Please register [https://www.epay.ed.ac.uk/conferences-and-events/college-of-science-and-engineering/school-of-informatics/informatics-events/ifip-working-group here].
After you 'Book Event', please choose either:
* '4 Day Attendee' or
* iff you're only attending partially, tick the boxes for the relevant days.

(If you plan to partially attend, please discuss with the Chairs first. I think it's somewhat unusual.)

You'll be prompted for additional details like contact details, allergies and dietary requirements after: adding to basket; proceeding to checkout; registering.

Please let me know if you have any problems. Please let me know if you won't be able to register before Thursday 28 Nov.

== Attendance ==
(Alphabetical by last name please)

* Guillaume Allais
* Nada Amin
* Sandrine Blazy
* Edwin Brady
* Jacques Carette
* Sebastian Erdweg
* Jeremy Gibbons
* Kevin Hammond
* Ohad Kammar
* Paul Kelly (on 5-6 only)
* Andras Kovacs
* Lindsey Kuper
* Julia Lawall
* Ralf Lämmel
* Sam Lindley
* James McKinna
* Peter Mosses
* Christoph Reichenbach
* Tiark Rompf
* Sven-Bodo Scholz
* Amir Shaikhha
* Friedrich Steimann
* Tijs van der Storm
* Jeremy Yallop

=== Local Observers ===
* Robert Wright

== Talks ==

See below for the schedule (but note that the actual scheduling of talks will not be available until the meeting starts). Members: please add yourself and your topic, alphabetically ordered by surname:

* Nada Amin [[WG211/M24Amin | Verified program synthesis ]]
* Sandrine Blazy [[WG211/M24Blazy | A Mechanized Semantics for Dataflow Circuits ]]
* Edwin Brady [[WG211/M24Brady | "Normalisation by Compilation": Typechecking Dependent Types via the Scheme Runtime ]]
* Jacques Carette [[WG211/M24Carette | Partial Evaluation meets Denotational Semantics ]]
* Sebastian Erdweg [[WG211/M24Erdweg | Stateful Differential Operators for Incremental Computing ]]
* Jeremy Gibbons [[WG211/M24Gibbons | Continuation−Passing Style‚ Defunctionalization‚ Accumulations‚ and Associativity ]]
* Kevin Hammond [[WG211/M24Hammond | Using Formal Methods at Scale in the Delivery of a High Assurance Distributed System: the Cardano Blockchain Implementation in Haskell ]]
* Andras Kovacs [[WG211/M24Kovacs | Runtime code generation with dependent types ]]
* Lindsey Kuper [[WG211/M24Kuper | Library-Level Choreographic Programming ]]
* Ralf Lämmel [[WG211/M24Laemmel | Type Inference in a Knowledge-Graph Setting]]
* Sam Lindley [[ WG211M24Lindley | Modal Effect Types ]]
* Peter Mosses [[ WG211/M24Mosses | Denotational Semantics in Agda ]]
* Tiark Rompf [[WG211/M24Rompf | Rhyme: A Data-Centric Multi-Paradigm Query Language ]]
* Friedrich Steimann [[ WG211/M24Steimann | A really old new metatheory of software languages ]]
* Amir Shaikhha [[ WG211M24Shaikhha | Democratizing Data Science by Leveraging Structure ]]

We will follow our usual format of interactive talks with an active audience, using a chess clock for timing, as follows. For each talk the speaker and the audience each get at most 25 minutes. The audience does not have to wait until the end of a talk to ask questions; interaction and discussion is encouraged. (But experience from previous meetings shows that it is useful to let the speaker at least finish the introduction before interrupting.) To ensure fairness, administration of the time used by each party is done using a chess clock. Operation of the clock rotates among participants. Both speaker and audience are expected to contribute to make talks and discussions engaging, interesting, and useful. Therefore, we observe a policy of no use of electronic devices during talks (other than the device the speaker uses to present slides). Bring paper and pen for making notes.

== Program / schedule ==

=== Scientific program ===

To be determined.

Tuesday, December 3

* 8:45 - 9:00 Welcome
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Break
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Lunch
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>>

Wednesday, December 4

* 9:00 - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Break
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Lunch
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>>

Thursday, December 5

* 9:00 - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Break
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>> Lunch
* <<TBD>> - <<TBD>> <n> talks
** <<TBD>> - <<TBD>>
* <<TBD>> - <<TBD>>

Friday, December 6

* 9:00 - <<TBD>> <<n>> talks
** <<TBD>>-<<TBD>> <<TBD>>
* <<TBD>> - <<TBD>> Break
* <<TBD>> - <<TBD>> 1 talk
* <<TBD>> Lunch

=== Social events ===

To be determined.