WG 2.11 - User contributions [en]

WG211/M26Schedule

2026-09-02T19:17:08Z

Jacques: /* Guests and Observers */

= IFIP Working Group 2.11, Twenty-sixth Meeting =

== October 13-16, 2026, Niagara-on-the-Lake, Ontario, Canada ==

The meeting will be held on the (outskirts of) Niagara-on-the-Lake, in the middle of the Niagara region wine country, hosted by [mailto:carette@mcmaster.ca Jacques Carette]. The meeting is planned for 3.5 days, with a half day on October 16. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will actually be held at a hotel (wineries were too expensive), the [https://www.hilton.com/en/hotels/xlvnlgi-hilton-garden-inn-niagara-on-the-lake/ Hilton Garden Inn]. Details to appear before June 10th. Be warned: the hotel itself is "in the middle of nowhere" (even though there are actually 3 hotels at that spot).

=== Group dinners ===

Dinners will be arranged at winery-restaurants. It will be necessary to take a (chartered) bus to get there, as there is nothing within easy walking distance of the hotel. Details will appear a couple of weeks before the event.

=== Group excursion ===

TBD.

=== Registration fee ===

Registration fee is TBD.

=== 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
* Atsushi Igarashi
* Ohad Kammar
* Julia Lawall
* Satnam Singh
* Friedrich Steimann
* Jeremy Yallop

=== Guests and Observers ===

* Michael Adams
* Shraddha Barke
* Andras Kovacs
* Amir Shaikhha
* Ningning Xie
* Jason Ballaci (local observer)
* Reed Mullanix (local observer)
* Harrison Goldstein

== Talks ==

The following people have confirmed they will giving a talk:

== Schedule ==

== Travel ==

For international travel, Toronto International (YYZ) is going to be simplest, but is still quite far away. '''But there's a trick! Instead book to YCM''' (Niagara District Airport). Then your 'flight' will include a direct bus from YYZ to YCM, and YCM is very close to the hotel (still need a taxi to get there.) Or book a Niagara Airbus shuttle (see below).

If you have already booked to YYZ, you can [https://landline.com/ add a landline trip] from YYZ.

For people who are closer, Toronto Island (YTZ), Hamilton (YHM) and Buffalo (BUF) are all possibilities.

'''<big>Getting to the Hotel</big>'''

* YCM: recommended. Easy taxi. You can now book YYZ <-> YCM with landline

* Also recommended: use https://www.niagaraairbus.com/ from any of YYZ, BUF, Niagara Falls NY airport, YHM and many other points.

* The hotel recommends CTG Canada - info@ctgcanada.ca - +1-877-967-0888. They offer service to/from Buffalo and Toronto. Another option would be Limos Niagara - info@limosniagara.com - +1-905-680-0606, though may not offer service from Buffalo. I have no personal experience with either.

* YYZ:
# by car, this is an easy 1h15 drive.
# by bus (not recommended, it is much longer, but if you insist): a) Take a https://flixbus.ca to St Catharines or Niagara and then a local bus (or taxi) to the hotel. St Catherines is closer. The flixbus is direct, so decently fast. b) you can take two GO buses to Niagara College which is 'across the street' (erm, major highay); a cab/Uber from there is simplest, but it is just over 1km, so walkable. There are other options too (a variety of trains + buses) but all take roughly 3 hours to get you there. Google maps can inform you.

==== Visa Information ====

Apparently most visitors to Canada now need an "electronic travel authorization (eTA)", which costs $7 and can take several days to get. So plan to apply ahead!

==== Accommodation ====

There is a block of 20 rooms reserved for us at the Hilton Garden Inn, available via this [https://www.hilton.com/en/book/reservation/deeplink/?ctyhocn=XLVNLGI&groupCode=913&arrivaldate=2026-10-12&departuredate=2026-10-17&flexibleDates=true&cid=OM,WW,HILTONLINK,EN,DirectLink&fromId=HILTONLINKDIRECT deep link to Hilton's web site]. If you prefer, you can also call the hotel direct and reference "IFIP Working Group 2.11 -- McMaster -- SRP 913". They are holding this for us until '''Saturday September 12, 2026''', after which you can only get the normal rates.

There are two other hotels right next door. If you want an airbnb or similar, you will have to rent a car (or a bike) as there is nothing within easy walking distance. I've stayed in one in the town of Virgil myself, and quite enjoyed it. (I'll be at the hotel.)

Note that breakfast will be provided in the meeting room, so there is no need to arrange for that separately.

==== Weather ====

Early October in Southern Ontario has very unpredictable weather. It could be "warm fall", (22C) or cold (6C) and rainy. And that can change on a day-by-day basis. I have never seen it snow that early.

==== Arrivals and departures of attendees ====

WG211/M26Schedule

2026-08-24T20:04:45Z

Jacques: /* Guests and Observers */

= IFIP Working Group 2.11, Twenty-sixth Meeting =

== October 13-16, 2026, Niagara-on-the-Lake, Ontario, Canada ==

The meeting will be held on the (outskirts of) Niagara-on-the-Lake, in the middle of the Niagara region wine country, hosted by [mailto:carette@mcmaster.ca Jacques Carette]. The meeting is planned for 3.5 days, with a half day on October 16. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will actually be held at a hotel (wineries were too expensive), the [https://www.hilton.com/en/hotels/xlvnlgi-hilton-garden-inn-niagara-on-the-lake/ Hilton Garden Inn]. Details to appear before June 10th. Be warned: the hotel itself is "in the middle of nowhere" (even though there are actually 3 hotels at that spot).

=== Group dinners ===

Dinners will be arranged at winery-restaurants. It will be necessary to take a (chartered) bus to get there, as there is nothing within easy walking distance of the hotel. Details will appear a couple of weeks before the event.

=== Group excursion ===

TBD.

=== Registration fee ===

Registration fee is TBD.

=== 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
* Atsushi Igarashi
* Ohad Kammar
* Julia Lawall
* Satnam Singh
* Friedrich Steimann
* Jeremy Yallop

=== Guests and Observers ===

* Jason Ballaci (local observer)
* Reed Mullanix (local observer)

== Talks ==

The following people have confirmed they will giving a talk:

== Schedule ==

== Travel ==

For international travel, Toronto International (YYZ) is going to be simplest, but is still quite far away. '''But there's a trick! Instead book to YCM''' (Niagara District Airport). Then your 'flight' will include a direct bus from YYZ to YCM, and YCM is very close to the hotel (still need a taxi to get there.) Or book a Niagara Airbus shuttle (see below).

If you have already booked to YYZ, you can [https://landline.com/ add a landline trip] from YYZ.

For people who are closer, Toronto Island (YTZ), Hamilton (YHM) and Buffalo (BUF) are all possibilities.

'''<big>Getting to the Hotel</big>'''

* YCM: recommended. Easy taxi. You can now book YYZ <-> YCM with landline

* Also recommended: use https://www.niagaraairbus.com/ from any of YYZ, BUF, Niagara Falls NY airport, YHM and many other points.

* The hotel recommends CTG Canada - info@ctgcanada.ca - +1-877-967-0888. They offer service to/from Buffalo and Toronto. Another option would be Limos Niagara - info@limosniagara.com - +1-905-680-0606, though may not offer service from Buffalo. I have no personal experience with either.

* YYZ:
# by car, this is an easy 1h15 drive.
# by bus (not recommended, it is much longer, but if you insist): a) Take a https://flixbus.ca to St Catharines or Niagara and then a local bus (or taxi) to the hotel. St Catherines is closer. The flixbus is direct, so decently fast. b) you can take two GO buses to Niagara College which is 'across the street' (erm, major highay); a cab/Uber from there is simplest, but it is just over 1km, so walkable. There are other options too (a variety of trains + buses) but all take roughly 3 hours to get you there. Google maps can inform you.

==== Visa Information ====

Apparently most visitors to Canada now need an "electronic travel authorization (eTA)", which costs $7 and can take several days to get. So plan to apply ahead!

==== Accommodation ====

There is a block of 20 rooms reserved for us at the Hilton Garden Inn, available via this [https://www.hilton.com/en/book/reservation/deeplink/?ctyhocn=XLVNLGI&groupCode=913&arrivaldate=2026-10-12&departuredate=2026-10-17&flexibleDates=true&cid=OM,WW,HILTONLINK,EN,DirectLink&fromId=HILTONLINKDIRECT deep link to Hilton's web site]. If you prefer, you can also call the hotel direct and reference "IFIP Working Group 2.11 -- McMaster -- SRP 913". They are holding this for us until '''Saturday September 12, 2026''', after which you can only get the normal rates.

There are two other hotels right next door. If you want an airbnb or similar, you will have to rent a car (or a bike) as there is nothing within easy walking distance. I've stayed in one in the town of Virgil myself, and quite enjoyed it. (I'll be at the hotel.)

Note that breakfast will be provided in the meeting room, so there is no need to arrange for that separately.

==== Weather ====

Early October in Southern Ontario has very unpredictable weather. It could be "warm fall", (22C) or cold (6C) and rainy. And that can change on a day-by-day basis. I have never seen it snow that early.

==== Arrivals and departures of attendees ====

WG211/M26Schedule

2026-08-24T20:00:36Z

Jacques: /* Travel */

= IFIP Working Group 2.11, Twenty-sixth Meeting =

== October 13-16, 2026, Niagara-on-the-Lake, Ontario, Canada ==

The meeting will be held on the (outskirts of) Niagara-on-the-Lake, in the middle of the Niagara region wine country, hosted by [mailto:carette@mcmaster.ca Jacques Carette]. The meeting is planned for 3.5 days, with a half day on October 16. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will actually be held at a hotel (wineries were too expensive), the [https://www.hilton.com/en/hotels/xlvnlgi-hilton-garden-inn-niagara-on-the-lake/ Hilton Garden Inn]. Details to appear before June 10th. Be warned: the hotel itself is "in the middle of nowhere" (even though there are actually 3 hotels at that spot).

=== Group dinners ===

Dinners will be arranged at winery-restaurants. It will be necessary to take a (chartered) bus to get there, as there is nothing within easy walking distance of the hotel. Details will appear a couple of weeks before the event.

=== Group excursion ===

TBD.

=== Registration fee ===

Registration fee is TBD.

=== 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
* Atsushi Igarashi
* Ohad Kammar
* Julia Lawall
* Satnam Singh
* Friedrich Steimann
* Jeremy Yallop

=== Guests and Observers ===

== Talks ==

The following people have confirmed they will giving a talk:

== Schedule ==

== Travel ==

For international travel, Toronto International (YYZ) is going to be simplest, but is still quite far away. '''But there's a trick! Instead book to YCM''' (Niagara District Airport). Then your 'flight' will include a direct bus from YYZ to YCM, and YCM is very close to the hotel (still need a taxi to get there.) Or book a Niagara Airbus shuttle (see below).

If you have already booked to YYZ, you can [https://landline.com/ add a landline trip] from YYZ.

For people who are closer, Toronto Island (YTZ), Hamilton (YHM) and Buffalo (BUF) are all possibilities.

'''<big>Getting to the Hotel</big>'''

* YCM: recommended. Easy taxi. You can now book YYZ <-> YCM with landline

* Also recommended: use https://www.niagaraairbus.com/ from any of YYZ, BUF, Niagara Falls NY airport, YHM and many other points.

* The hotel recommends CTG Canada - info@ctgcanada.ca - +1-877-967-0888. They offer service to/from Buffalo and Toronto. Another option would be Limos Niagara - info@limosniagara.com - +1-905-680-0606, though may not offer service from Buffalo. I have no personal experience with either.

* YYZ:
# by car, this is an easy 1h15 drive.
# by bus (not recommended, it is much longer, but if you insist): a) Take a https://flixbus.ca to St Catharines or Niagara and then a local bus (or taxi) to the hotel. St Catherines is closer. The flixbus is direct, so decently fast. b) you can take two GO buses to Niagara College which is 'across the street' (erm, major highay); a cab/Uber from there is simplest, but it is just over 1km, so walkable. There are other options too (a variety of trains + buses) but all take roughly 3 hours to get you there. Google maps can inform you.

==== Visa Information ====

Apparently most visitors to Canada now need an "electronic travel authorization (eTA)", which costs $7 and can take several days to get. So plan to apply ahead!

==== Accommodation ====

There is a block of 20 rooms reserved for us at the Hilton Garden Inn, available via this [https://www.hilton.com/en/book/reservation/deeplink/?ctyhocn=XLVNLGI&groupCode=913&arrivaldate=2026-10-12&departuredate=2026-10-17&flexibleDates=true&cid=OM,WW,HILTONLINK,EN,DirectLink&fromId=HILTONLINKDIRECT deep link to Hilton's web site]. If you prefer, you can also call the hotel direct and reference "IFIP Working Group 2.11 -- McMaster -- SRP 913". They are holding this for us until '''Saturday September 12, 2026''', after which you can only get the normal rates.

There are two other hotels right next door. If you want an airbnb or similar, you will have to rent a car (or a bike) as there is nothing within easy walking distance. I've stayed in one in the town of Virgil myself, and quite enjoyed it. (I'll be at the hotel.)

Note that breakfast will be provided in the meeting room, so there is no need to arrange for that separately.

==== Weather ====

Early October in Southern Ontario has very unpredictable weather. It could be "warm fall", (22C) or cold (6C) and rainy. And that can change on a day-by-day basis. I have never seen it snow that early.

==== Arrivals and departures of attendees ====

WG211/M26Schedule

2026-08-21T16:29:17Z

Jacques: /* Travel */

= IFIP Working Group 2.11, Twenty-sixth Meeting =

== October 13-16, 2026, Niagara-on-the-Lake, Ontario, Canada ==

The meeting will be held on the (outskirts of) Niagara-on-the-Lake, in the middle of the Niagara region wine country, hosted by [mailto:carette@mcmaster.ca Jacques Carette]. The meeting is planned for 3.5 days, with a half day on October 16. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will actually be held at a hotel (wineries were too expensive), the [https://www.hilton.com/en/hotels/xlvnlgi-hilton-garden-inn-niagara-on-the-lake/ Hilton Garden Inn]. Details to appear before June 10th. Be warned: the hotel itself is "in the middle of nowhere" (even though there are actually 3 hotels at that spot).

=== Group dinners ===

Dinners will be arranged at winery-restaurants. It will be necessary to take a (chartered) bus to get there, as there is nothing within easy walking distance of the hotel. Details will appear a couple of weeks before the event.

=== Group excursion ===

TBD.

=== Registration fee ===

Registration fee is TBD.

=== 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
* Atsushi Igarashi
* Ohad Kammar
* Julia Lawall
* Satnam Singh
* Friedrich Steimann
* Jeremy Yallop

=== Guests and Observers ===

== Talks ==

The following people have confirmed they will giving a talk:

== Schedule ==

== Travel ==

For international travel, Toronto International (YYZ) is going to be simplest, but is still quite far away. '''But there's a trick! Instead book to YCM''' (Niagara District Airport). Then your 'flight' will include a direct bus from YYZ to YCM, and YCM is very close to the hotel (still need a taxi to get there.) Or book a Niagara Airbus shuttle (see below).

If you have already booked to YYZ, you can [https://landline.com/ add a landline trip] from YYZ.

For people who are closer, Toronto Island (YTZ), Hamilton (YHM) and Buffalo (BUF) are all possibilities.

'''<big>Getting to the Hotel</big>'''

* YCM: recommended. Easy taxi. You can now book YYZ <-> YCM with landline

* Also recommended: use https://www.niagaraairbus.com/ from any of YYZ, BUF, Niagara Falls NY airport, YHM and many other points.

* YYZ:
# by car, this is an easy 1h15 drive.
# by bus (not recommended, it is much longer, but if you insist): a) Take a https://flixbus.ca to St Catharines or Niagara and then a local bus (or taxi) to the hotel. St Catherines is closer. The flixbus is direct, so decently fast. b) you can take two GO buses to Niagara College which is 'across the street' (erm, major highay); a cab/Uber from there is simplest, but it is just over 1km, so walkable. There are other options too (a variety of trains + buses) but all take roughly 3 hours to get you there. Google maps can inform you.

==== Visa Information ====

Apparently most visitors to Canada now need an "electronic travel authorization (eTA)", which costs $7 and can take several days to get. So plan to apply ahead!

==== Accommodation ====

There is a block of 20 rooms reserved for us at the Hilton Garden Inn, available via this [https://www.hilton.com/en/book/reservation/deeplink/?ctyhocn=XLVNLGI&groupCode=913&arrivaldate=2026-10-12&departuredate=2026-10-17&flexibleDates=true&cid=OM,WW,HILTONLINK,EN,DirectLink&fromId=HILTONLINKDIRECT deep link to Hilton's web site]. If you prefer, you can also call the hotel direct and reference "IFIP Working Group 2.11 -- McMaster -- SRP 913". They are holding this for us until '''Saturday September 12, 2026''', after which you can only get the normal rates.

There are two other hotels right next door. If you want an airbnb or similar, you will have to rent a car (or a bike) as there is nothing within easy walking distance. I've stayed in one in the town of Virgil myself, and quite enjoyed it. (I'll be at the hotel.)

Note that breakfast will be provided in the meeting room, so there is no need to arrange for that separately.

==== Weather ====

Early October in Southern Ontario has very unpredictable weather. It could be "warm fall", (22C) or cold (6C) and rainy. And that can change on a day-by-day basis. I have never seen it snow that early.

==== Arrivals and departures of attendees ====

WG211/M26Schedule

2026-08-21T16:18:11Z

Jacques: /* Travel */

= IFIP Working Group 2.11, Twenty-sixth Meeting =

== October 13-16, 2026, Niagara-on-the-Lake, Ontario, Canada ==

The meeting will be held on the (outskirts of) Niagara-on-the-Lake, in the middle of the Niagara region wine country, hosted by [mailto:carette@mcmaster.ca Jacques Carette]. The meeting is planned for 3.5 days, with a half day on October 16. More details, program, and registration information will be appearing on this page in the next few weeks.

=== Venue ===

The meeting will actually be held at a hotel (wineries were too expensive), the [https://www.hilton.com/en/hotels/xlvnlgi-hilton-garden-inn-niagara-on-the-lake/ Hilton Garden Inn]. Details to appear before June 10th. Be warned: the hotel itself is "in the middle of nowhere" (even though there are actually 3 hotels at that spot).

=== Group dinners ===

Dinners will be arranged at winery-restaurants. It will be necessary to take a (chartered) bus to get there, as there is nothing within easy walking distance of the hotel. Details will appear a couple of weeks before the event.

=== Group excursion ===

TBD.

=== Registration fee ===

Registration fee is TBD.

=== 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
* Atsushi Igarashi
* Ohad Kammar
* Julia Lawall
* Satnam Singh
* Friedrich Steimann
* Jeremy Yallop

=== Guests and Observers ===

== Talks ==

The following people have confirmed they will giving a talk:

== Schedule ==

== Travel ==

For international travel, Toronto International (YYZ) is going to be simplest, but is still quite far away. '''But there's a trick! Instead book to YCM''' (Niagara District Airport). Then your 'flight' will include a direct bus from YYZ to YCM, and YCM is very close to the hotel (still need a taxi to get there.)

If you have already booked to YYZ, you can [https://landline.com/ add a landline trip] from YYZ.

For people who are closer, Toronto Island (YTZ), Hamilton (YHM) and Buffalo (BUF) are all possibilities.

'''<big>Getting to the Hotel</big>'''

- YCM: recommended. Easy taxi. You can now book YYZ <-> YCM with landline

- Also recommended: use https://www.niagaraairbus.com/ from any of YYZ, BUF, Niagara Falls NY airport, YHM and many other points.

- YYZ:

- by car, this is an easy 1h15 drive.

- by bus (not recommended, it is much longer, but if you insist):

- Take a https://flixbus.ca to St Catharines or Niagara and then a local bus (or taxi) to the hotel. St Catherines is closer. The flixbus is direct, so quite fast.

- you can take two GO buses to Niagara College which is 'across the street' (erm, major highay); a cab/Uber from there is simplest, but it is just over 1km, so walkable. There are other options too (a variety of trains + buses) but all take roughly 3 hours to get you there. Google maps can inform you.

==== Visa Information ====

Apparently most visitors to Canada now need an "electronic travel authorization (eTA)", which costs $7 and can take several days to get. So plan to apply ahead!

==== Accommodation ====

There is a block of 20 rooms reserved for us at the Hilton Garden Inn, available via this [https://www.hilton.com/en/book/reservation/deeplink/?ctyhocn=XLVNLGI&groupCode=913&arrivaldate=2026-10-12&departuredate=2026-10-17&flexibleDates=true&cid=OM,WW,HILTONLINK,EN,DirectLink&fromId=HILTONLINKDIRECT deep link to Hilton's web site]. If you prefer, you can also call the hotel direct and reference "IFIP Working Group 2.11 -- McMaster -- SRP 913". They are holding this for us until '''Saturday September 12, 2026''', after which you can only get the normal rates.

There are two other hotels right next door. If you want an airbnb or similar, you will have to rent a car (or a bike) as there is nothing within easy walking distance. I've stayed in one in the town of Virgil myself, and quite enjoyed it. (I'll be at the hotel.)

Note that breakfast will be provided in the meeting room, so there is no need to arrange for that separately.

==== Weather ====

Early October in Southern Ontario has very unpredictable weather. It could be "warm fall", (22C) or cold (6C) and rainy. And that can change on a day-by-day basis. I have never seen it snow that early.

==== Arrivals and departures of attendees ====

WG211/M26Schedule

2026-06-13T17:40:37Z

Jacques: /* Members attending */

WG211/M26Schedule

2026-06-12T20:52:19Z

Jacques: /* Accommodation */

WG211/M26Schedule

2026-06-12T20:49:05Z

Jacques: /* Accommodation */

WG211/M26Schedule

2026-06-12T20:48:48Z

Jacques: /* Travel */

WG211/M26Schedule

2026-06-12T20:48:12Z

Jacques: /* Venue */

WG211/M26Schedule

2026-06-12T20:46:11Z

Jacques: /* Venue */

WG211/M26Schedule

2026-06-05T18:15:32Z

Jacques: Created page with "= IFIP Working Group 2.11, Twenty-sixth Meeting = == October 13-16, 2026, Niagara-on-the-Lake, Ontario, Canada == The meeting will be held on the (outskirts of) Niagara-on-the-Lake, in the middle of the Niagara region wine country, hosted by [mailto:carette@mcmaster.ca Jacques Carette]. The meeting is planned for 3.5 days, with a half day on October 16. More details, program, and registration information will be appearing on this page in the next few weeks. === Venue..."

Main Page

2026-06-05T16:49:06Z

Jacques: /* Current Activity */

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/M26Schedule | Twenty-sixth meeting in Niagara-on-the-lake, Ontario, Canada ]] (October 13-16, 2026)

==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/M25Schedule | Twenty-fifth meeting in Stellenbosch, South Africa ]]
* [[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

2026-06-05T16:47:31Z

Jacques: /* Past Activity */

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/M25Schedule | Twenty-fifth meeting in Stellenbosch, South Africa ]]
* [[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.

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.