comp.lang.prolog Frequently Asked Questions
From: Remko Troncon (remko.troncon_at_cs.kuleuven.ac.be)
Date: 12/16/03
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Date: Tue, 16 Dec 2003 22:01:01 +0000 (UTC)
Archive-name: prolog/faq
Original-by: jamie at cs.sfu.ca (Jamie Andrews)
URL: http://www.cs.kuleuven.ac.be/~remko/prolog/faq/
Posting-frequency: twice a month
Last-modified: 2003-12-16
Last-changes:
Updated ECLiPSe entry.
Frequently Asked Questions - comp.lang.prolog
Remko Troncon (Jan. 6 2002 - ... )
Dirk-Jan Faber (Feb. 1 1999 - Jan. 6 2002)
Jamie Andrews (Aug 26 1992 - Oct. 16 1997)
_________________________________________________________________
General Information: This article contains the answers to some
Frequently Asked Questions (FAQ) often seen in
news://comp.lang.prolog/. It is posted (twice a month, currently on
the 2nd and 16th) to help reduce volume in this newsgroup and to
provide hard-to-find information of general interest.
The World Wide Web URL for this FAQ is:
http://www.cs.kuleuven.ac.be/~remko/prolog/faq/
Questions about the FAQ and updates ought to be submitted to
<remko.troncon@cs.kuleuven.ac.be>.
1. What is the Association for Logic Programming?
2. Where can I get a free Prolog for system X (PC, Mac, Unix or
other)?
3. What commercial systems are available? What about systems available
for a price from research institutions?
4. How do I get in touch with my Prolog's users' group, sales
representative, or technical support line?
5. I think language X is better than Prolog. What do you think?
6. What are the recent developments?
7. My Prolog prof assigned me this problem. Can you help me with it?
8. Can you suggest some books on Prolog?
9. Are there any WWW archives of comp.lang.prolog ?
10. How can I get the ISO Prolog standard? Where can I go for more
information about it?
11. How does the WAM (Warren Abstract Machine) work? How do I write a
WAM-based compiler or a WAM emulator?
12. Is there a WWW page on logic programming?
13. Can do I do Internet/WWW programming with Prolog?
14. Is there a WWW page with some tutorials on prolog?
1. What is the Association for Logic Programming?
To keep up with the current state of logic programming technology,
readers can join the Association for Logic Programming (ALP) and
receive their Newsletter. For details on how to join or send in
contributions, check http://www.cwi.nl/projects/alp/ or contact
Sandro Etalle <etalle@cs.utwente.nl>
The Prolog Resource Guide (v0.6) was printed in issue 5/1 of the
Newsletter (Feb. 1992). This lists information concerning Prolog
Archives, Books, Suppliers, etc. It is now maintained by Mark
Kantrowitz (<Mark.Kantrowitz@glinda.oz.cs.cmu.edu>), and used to be
posted periodically to news://comp.lang.prolog.
2. Where can I get a free Prolog for system X (PC, Mac, Unix or
other)?
The following are anonymous-FTP sites for free Prologs (or related
languages) which are either in the public domain or are "copy-lefted"
(permitted to be copied with some restrictions on commercial use).
(Please note that for extensive development work, users will probably
want a robust interpreter or compiler with good debugging facilities
and a standard syntax, among other things. While public-domain systems
are a valuable service to the community, they do not necessarily have
all these things, and users should weigh carefully what they want to
do against the capabilities and costs of the available systems.)
ALF (Albgebraic Logic Functional language)
+ Platforms: UNIX
+ Available: Unknown
+ E-mail: Rudolf Opalla
<opalla@julien.informatik.uni-dortmund.de>
+ Info: WAM-based language with narrowing/rewriting
Amzi! Prolog + Logic Server
+ Platforms: Window, Linux and Solaris
+ Available: http://www.amzi.com/download/
+ E-mail: <info@amzi.com>
+ Info: Registration is compulsory, except for the Free
Academic/Personal/Evaluation License.
Aquarius Prolog 1.0
+ Platforms: UNIX
+ Available: http://www.info.ucl.ac.be/people/PVR/aquarius.html
+ Info: High performance, commercial functionality except
debugging and modules.
Argo Prolog v.1.1
+ Platforms: Solaris 1.x and HP-UX 9.x
+ Available: Unknown
+ Contact: Takao Doi <doi@csk.co.jp>
Arity/Prolog32
+ Platforms: Win32
+ Available: http://www.arity.com/www.pl/products/ap.htm
+ Info: Arity/Prolog32 provides a complete Prolog programming
environment in which you can write, debug, and run Prolog
programs in 32-bit Windows environments (95/98/NT/2000).
Arity/Prolog32 is a powerful, highly optimized, and extended
version of the logic programming language Prolog.
Arity/Prolog32 is a complete compiler and interpreter written
in Prolog, C, and Assembly language and is a superset of
Clocksin and Mellish Prolog.
B-Prolog 4.0
+ Platforms: Win32, Solaris, SunOS, UNIX, FreeBSD and Linux
+ Available: http://www.probp.com/
+ E-mail: Neng-Fa Zhou <support@probp.com>
+ Info: Freely available for non-commercial use. For other use
a license is needed.
BinProlog 7.0
+ Platforms: Windows 95/98/NT, Linux and all major Unix
platforms.
+ Available: http://www.binnetcorp.com/BinProlog/
+ E-mail: Paul Tarau <binnetcorp@binnetcorp.com>
+ Info: Download free evaluation copies and see online demos.
Inexpensive Educational licensing available.Has built-in
networking, multi-threading, mobile code and distributed
blackboards. Supports BinNet Internet Programming Tool kit
(see http://www.binnetcorp.com/Internet).
Brain Aid Prolog (BAP) v1.4
+ Platforms: Transputer systems
+ Available:
http://www.comnets.rwth-aachen.de/~ost/private.html
+ Info: BAP is a parallel prolog system for Transputer systems.
Available under a Berkely style of copyright.
Ciao 1.4
+ Platforms: Linux, Win32 (95/98/NT), Solaris, SunOS, UNIX in
general.
+ Available: http://www.clip.dia.fi.upm.es/Software/Ciao
+ E-mail: Developers <ciao@clip.dia.fi.upm.es>, Users
<ciao-users@clip.dia.fi.upm.es>
+ Info: Next generation LP/CLP system. Commercial
functionality, but freely available w/source. ISO-Prolog +
modules, networking, multi-threading, clp(r), clp(q),
interfaces (Java, C, tcltk, WWW, databases/ODBC, ...),
functions, higher-order, records, persistence, objects,
assertions (types, modes, ...), source debugger,
auto-documenter, static debugger, and more.
clp(FD)
+ Platforms: UNIX
+ Available: anonymous FTP from
ftp://ftp.inria.fr/INRIA/Projects/ChLoE/LOGIC_PROGRAMMING/clp
_fd
+ Contact: Daniel Diaz <daniel.diaz@inria.fr>
+ Info: Constraint logic programming over finite domains.
Requires GNU C v.2.4.5 or higher.
clp(FD,S)
+ Platforms: UNIX
+ Available:
http://contraintes.inria.fr/~georget/software/clp_fds/clp_fds
.html
+ Contact: Yan Georget <Yan.Georget@inria.fr>
+ Info: Requires GNU C (gcc) version 2.4.5. or higher.
CLP(R)
+ Platforms: UNIX
+ Available: E-mail request from Joxan Jaffar
<joxan@watson.ibm.com>.
+ Info: Constraint logic programming language, for academic and
research purposes only.
ECLiPSe Constraint Logic Programming System, subsuming Prolog.
+ Platforms: Solaris, Linux, Linux/Alpha, MacOS X, Windows
+ Available: http://www.icparc.ic.ac.uk/eclipse/
+ Info: License required, but free for research and educational
purposes.
GNU Prolog
+ Platforms: Many Unixes, Windows, MacOS X
+ Available: http://gnu-prolog.inria.fr/
+ E-mail: Daniel Diaz <daniel.diaz@inria.fr>
Jinni 2.27
+ Platforms: Java-based
+ Available: http://www.binnetcorp.com/Jinni
+ Info: Multi-threaded, Java based Prolog interpreter with
built-in networking, distributed blackboards and mobile code
(inexpensive shareware licensing available).
JIProlog
+ Platforms: Java-based
+ Available: http://www.ugosweb.com/jiprolog
+ Info: Java Internet Prolog is a cross-platform pure Java 100%
prolog interpreter that supplies Java world with the power of
prolog language and provides prolog language with a
technology to implement new predicates in Java.
KLIC
+ Platforms: UNIX
+ Available: Anonymous FTP from
ftp://ftp.icot.or.jp/ifs/symbolic-proc/unix/klic/klic.tgz.
+ Info: ICOT Free Software. Concurrent logic programming.
Tested on Sparcs, DEC 7000, Gateway P5-60.
+ Contact: <ifs@icot.or.jp>
Logtalk 2.11.0
+ Platforms: Any Operating System running a Prolog Compiler
+ Available: http://www.logtalk.org
+ E-mail: Paulo Moura <pmoura@logtalk.org>
+ Info: Open source object-oriented extension to Prolog
compatible with most Prolog compilers.
LPA Win-Prolog, demo version
+ Platforms: Windows
+ Available: Available from http://www.lpa.co.uk/ind_dow.htm
MINERVA
+ Platforms: Java
+ Available: Available from http://www.ifcomputer.co.jp/MINERVA
+ Info: Proprietory commercial ISO-Prolog Compiler in 100% Java
support for web programming, XML, servlets, applets,
standalones. Free evaluation license.
Modular SB-Prolog (= SB-Prolog version 3.1 plus modules)
+ Platforms: SPARC, DECstation, MIPS, HP 9000 series, Sun 3.
+ Available: Anonymous FTP from ftp://ftp.dcs.ed.ac.uk/
+ Info: Copy-lefted.
Newt Prolog
+ Platforms: Apple MessagePad Newton
+ Available: Currently only beta version available; download
and more information on http://www.cfht.hawaii.edu/~jlv
+ E-mail: <jlv@cfht.hawaii.edu>
Open Prolog
+ Platforms: Apple Macintosh
+ Available: http://www.cs.tcd.ie/open-prolog/
+ E-mail: <brady@cs.tcd.ie>. (Michael Brady).
Poplog Prolog
+ Platforms: Various Unixes, including Sun, Dec Alpha, HP and
many others. Also a Win32 version is available. Sources
available for other combinations.
+ Available: At the Free Poplog Web/FTP site, including full
sources
http://www.cs.bham.ac.uk/research/poplog/freepoplog.html
Mirror sites at http://www.poplog.org/resources/dist/new/
+ E-mail: queries may be posted to news://comp.lang.pop/, or to
<pop-forum@cs.bham.ac.uk> or <A.Sloman@cs.bham.ac.uk> (Last
resort!)
+ Info: Robust incremental compiler, part of the multi-language
Poplog system (including Common Lisp, Pop-11 and Standard
ML). Unix, Linux & VMS versions include full support for X
window facilities/Motif. More information at
http://www.cs.bham.ac.uk/research/poplog/poplog.info.html
Licence modelled on XFree86. Can be freely distributed,
though copyright is owned by Sussex University and ISL.
PIE2
+ Platforms: Unknown
+ Available: On CompuServe in the AIEXPERT forum, interpreter
and examples in PIE2.ZIP, documentation in PIEDOC.ZIP.
+ E-mail: Brent Ruggles <ruggles@shell.com>
QuProlog
+ Platforms: UNIX, Linux, beta for MAC
+ Available:
http://www.itee.uq.edu.au/~pjr/HomePages/QuPrologHome.html
+ E-mail: <pjr@itee.uq.edu.au>
+ Info: Extended WAM with support for quantifiers and
substitutions, multi-threaded, high-level communication.
Strawberry Prolog
+ Platforms: Windows 95/NT, plans for UNIX and Macintosh
+ Available: http://www.dobrev.com/
+ E-mail: <dimiter@dobrev.com>
SWI Prolog
+ Platforms: Binaries for Linux, Windows (95/98/ME/NT/2000/XP)
and MacOS X (darwin). Sources: ANSI-C, both 32 and 64-bit
machines, compiles on almost all Unix systems, BeOS and more.
+ Available: http://www.swi-prolog.org,
ftp://ftp.swi.psy.uva.nl/SWI-Prolog,
ftp://ftp.th-darmstadt.de/pub/programming/languages/prolog/sw
i-prolog/
+ Info: Complete, ISO and Edinburgh standard, common
optimizations, GC including atoms. Portable graphics,
source-level debugger, advanced syntax colouring.
+ License: LGPL
Trinc-Prolog
+ Platforms: Windows 95/98/NT 4.0, plans for Windows 2000,
Linux and Sun Solaris
+ Available: http://www.trinc-prolog.com/
+ E-mail: <info@trinc-prolog.com>
UPMAIL Tricia Prolog
+ Platforms: Apple Macintosh
+ Available: Anonymous FTP from ftp://ftp.csd.uu.se/pub/Tricia;
get README first.
+ Info: UPMAIL is still available, but unsupported.
Visual Prolog
+ Platforms: Win32
+ Available: http://www.visual-prolog.com
+ Info: Includes all the facilities necessary to write mission
critical commercial-grade applications. Fully visual
development environment. Open architecture. Object-oriented.
Built-in database system and ODBC support. Visual Prolog
Personal Edition is available on a freeware license.
wamcc
+ Platforms: UNIX
+ Available: Anonymous FTP from
ftp://ftp.inria.fr/INRIA/Projects/ChLoE/LOGIC_PROGRAMMING/wam
cc
+ Info: Compiler which translates Prolog to C via WAM.
Debuggers. Requires GNU C v.2.4.5 or higher.
+ Contact: Daniel Diaz <daniel.diaz@inria.fr>
XGP
+ Platforms: Apple Macintosh OS X, 10.2.3+
+ Available: http://xgp.sourceforge.net/
+ Info: XGP is an open source (GPL) integrated development
environment with user interface and graphics support based on
gprolog and Cocoa under Macintosh OS X.
XSB
+ Platforms: Many, including SunOS, Linux and Windows
+ Available: http://xsb.sourceforge.net/
+ E-mail: <xsb-users@lists.sourceforge.net>
+ Info: system with SLG-resolution, HiLog syntax, and
unification factoring.
Yap 4.2.0
+ Platforms: UNIX-based platforms and Windows
+ Available: http://www.ncc.up.pt/~vsc/Yap/
+ E-mail: Vitor Santos Costa <vsc@ncc.up.pt>
+ Info: Yap is entirely written in C and Prolog and should be
portable to most 32-bit and 64-bit Unix based platforms. A
Windows port is also available. Yap4.2 is distributed under
Perl's artistic license and can be freely distributed.
3. What commercial systems are available? What about systems available
for a price from research institutions?
Many commercial systems are listed in the Prolog Resource Guide. The
Resource Guide also lists many systems which are not exactly
"commercial", but available for a price from research instutitions.
The list of such systems was originally compiled by Chris Moss, of
Imperial College. The rest of the Resource Guide was originally
compiled by Dag Wahlberg, of Uppsala University.
The Prolog Resource Guide hasn't been updated lately, but nevertheless
still contains some valuable information. It can be found at
http://www-2.cs.cmu.edu/Groups/AI/html/faqs/lang/prolog/prg/top.html.
4. How do I get in touch with my Prolog's users' group, sales
representative, or technical support line?
Here are some e-mail addresses of these contacts, listed
alphabetically by company or major product name.
ALS (Applied Logic Systems)
+ Information: <info@als.com>
+ Sales: <sales@als.com>
+ Tech support:<support@als.com>
Amzi! inc.
+ Web site: http://www.amzi.com
+ Information: <info@amzi.com>
+ Sales: <sales@amzi.com>
+ Support: <support@amzi.com>
Arity/Prolog32
+ Web site: http://www.arity.com/www.pl/products/ap.htm
BinNet Corporation
+ Web site: http://www.binnetcorp.com
+ Information: <info@binnetcorp.com>
+ Sales: <sales@binnetcorp.com>
+ Tech support:<support@binnetcorp.com>
Ciao, PiLLoW, WebDB, etc.
+ Web site: http://www.clip.dia.fi.upm.es/Software
+ Users' group: <ciao-users@clip.dia.fi.upm.es>
+ Information: <ciao@clip.dia.fi.upm.es>
+ Tech support: <ciao-bugs@clip.dia.fi.upm.es>
COSYTEC (CHIP V5)
+ Web site: http://www.cosytec.com
+ Information: <info@cosytec.com> (or .fr)
+ Tech Support: <support@cosytec.com> (or .fr)
ECLiPSe and Sepia
+ Web site: http://www.icparc.ic.ac.uk/eclipse
+ Users' group: <eclipse-users@icparc.ic.ac.uk>
+ Information: <eclipse-request@icparc.ic.ac.uk>
+ Tech support: <eclipse-bugs@icparc.ic.ac.uk>
Expert Systems Ltd. (Prolog-2)
+ Sales: <sales@expert.demon.co.uk>
+ Support: <support@expert.demon.co.uk>
+ Users' group: <prolog2-request@hplb.hpl.hp.com>
GNU Prolog
+ Web site: http://gnu-prolog.inria.fr/
+ Users' group: <users-prolog-request@gnu.org>
+ Bug reports: <bug-prolog@gnu.org>
LPA
+ Web site: http://www.lpa.co.uk/
+ Sales: <sales@lpa.co.uk>
+ Tech support: <support@lpa.co.uk>
MasterProLog
+ Formerly BIM ProLog
+ Web site: http://www.itmasters.com/Products/MP/
PDC Prolog
+ PDC Prolog is the succesor to Turbo Prolog and the
predecessor to Visual Prolog.
ProLog by BIM
+ Currently MasterProLog
Quintus
+ Users' group: <quintus-users-request@sics.se>
+ Sales: <qpsales@sics.se>
+ Tech support: <qpsupport@sics.se>
SICStus
+ Users' group: <sicstus-users-request@sics.se>
+ Sales: <sicstus-request@sics.se>
+ Tech support: <sicstus-support@sics.se>
Trinc / Trinc-Prolog
+ Information: <info@trinc-prolog.com>
+ Sales: <sales@trinc-prolog.com>
+ Support: <support@trinc-prolog.com>
Turbo Prolog
+ Turbo Prolog is the predecessor of PDC Prolog (see above).
Visual Prolog
+ Web site: http://www.visual-prolog.com/
+ Information: <sales@pdc.dk> (or <sales@visual-prolog.com>)
+ Sales: <sales@pdc.dk> (or <sales@visual-prolog.com>)
+ Tech support:<support@pdc.dk> (or
<support@visual-prolog.com>)
5. I think language X is better than Prolog. What do you think?
These debates rarely result in any productive discussion. To some
extent, one's favourite language is based on irrational ideology.
However, many people now agree that different languages are good for
different things. Prolog seems to be good for problems in which logic
is intimately involved, or whose solutions have a succinct logical
characterization. Like other interactive, symbolic languages, Prolog
is also good for rapid prototyping.
Also, please note that there are many different "Prologs" and other
logic programming languages available, all with different
capabilities.
6. What are the recent developments?
There are some languages in development which do not have Prolog
syntax, but do subsume and generalize Prolog's logic programming
abilities.
The Mozart Consortium:
+ Web site: http://www.mozart-oz.org/
+ Users' group: <users-request@mozart-oz.org>
+ Tech support: <users@mozart-oz.org>
Mercury
+ Web site: http://www.cs.mu.oz.au/research/mercury/
Some other languages bring new developments while also supporting
Prolog syntax and functionality as an option:
Ciao:
+ Web site: http://www.clip.dia.fi.upm.es/Software
+ Users' group: <ciao-users@clip.dia.fi.upm.es>
+ Information: <ciao@clip.dia.fi.upm.es>
+ Tech support: <ciao-bugs@clip.dia.fi.upm.es>
7. My Prolog prof assigned me this problem. Can you help me with it?
If your instructor assigned it to you, he or she probably wanted you
to do it yourself. If it's an introductory Prolog course, your
question might be elementary to most readers, so it might be a waste
of network resources to ask it. Please ask your instructor, a friend,
a teaching assistant, or a local newsgroup for help first.
That being said, there are news://comp.lang.prolog/ readers who would
be glad to help people making a legitimate attempt to learn Prolog.
8. Can you suggest some books on Prolog?
The Prolog Resource Guide (see above, question 3) contains a listing
of Prolog books. It is maintained by Mark Kantrowitz
(<Mark.Kantrowitz@glinda.oz.cs.cmu.edu>), and posted periodically on
news://comp.lang.prolog.
Here are some of the most popular books on Prolog.
Introductory
+ "Programming In Prolog". William F. Clocksin and Christopher
S. Mellish. Springer-Verlag, 1994 (4th ed).
+ "Prolog Programming for Artificial Intelligence". Ivan
Bratko. Addison-Wesley, 2001 (3rd ed).
Advanced
+ "The Art of Prolog: Advanced Programming Techniques". Leon
Sterling and Ehud Shapiro. MIT Press, 1994 (2nd ed).
+ "The Craft of Prolog". Richard A. O'Keefe. MIT Press, 1990.
Logic programming theory
+ "Foundations of Logic Programming". John Lloyd.
Springer-Verlag, 1988 (2nd ed).
+ "Logic, Programming and Prolog". Ulf Nilsson and Jan
Maluszynski. Originally published by John Wiley & Sons Ltd
(2nd ed. 1995) but now available without charge from
http://www.ida.liu.se/~ulfni/lpp
Expert Systems
+ "Building Expert Systems in Prolog". Dennis Merritt.
Springer-Verlag, 1989. HTML & PDF versions available from
http://www.amzi.com/ExpertSystemsInProlog
9. Are there any WWW archives of comp.lang.prolog ?
Yes, there are: Google Groups has archives of
news://comp.lang.prolog/. They can be found at
http://groups.google.com/groups?group=comp.lang.prolog
10. How can I get the ISO Prolog standard? Where can I go for more
information about it?
The standard is described in "Prolog: The Standard (Reference
manual)", P. Deransart, A. Ed-Dbali, L. Cervoni, Springer Verlag
(1996). Extra information can be found on
http://pauillac.inria.fr/~deransar/prolog/docs.html
http://www-2.cs.cmu.edu/afs/cs.cmu.edu/project/ai-repository/ai/lang/p
rolog/doc/standard/ contains the December 1991 draft, the March 1993
draft, Richard O'Keefe's 1984 Prolog standard draft, and Michael
Covington's summary of the standard. Note that no one at that site can
answer any questions about the standard; it is just an FTP site for
the standard in the USA.
For more information about the ISO Prolog standard, contact:
Roger Scowen
ISO/IEC JTC1 SC22 WG17 (Prolog) convener,
DITC/93, National Physical Laboratory
TEDDINGTON, Middlesex TW11 0LW
UNITED KINGDOM
Tel: +44 81 943 6956
Fax: +44 81 977 7091
E-mail: <rss@seg.npl.co.uk>
11. How does the WAM (Warren Abstract Machine) work? How do I write a
WAM-based compiler or a WAM emulator?
Reportedly the best tutorial is Hassan Ait-Kaci's book "Warren's
Abstract Machine: A Tutorial Reconstruction" (MIT Press, 1991).The
book is now OP, but available online at
http://www.vanx.org/archive/wam/wam.html.
A public-domain WAM emulator, written in C++ by Herve Touati, is
available by anonymous FTP at
ftp://gatekeeper.dec.com/pub/plan/prolog/ucb
12. Is there a WWW page on logic programming?
Yes, there is one by Jonathan Bowen; the URL is
http://www.afm.sbu.ac.uk/logic-prog/. He invites us to mail him at
<jonathan.bowen@sbu.ac.uk> with any relevant information for
inclusion.
13. Can do I do Internet/WWW programming with Prolog?
Prolog is very suitable for this task. Several commercial and free
implementations include special support for it. A page specifically on
this topic (including some tutorials) is maintained at
http://www.clip.dia.fi.upm.es/lpnet/lpnet.html A public-domain library
exists (PiLLoW) for several popular Prolog systems which helps in the
task. See: http://www.clip.dia.fi.upm.es/Software/pillow/
14. Is there a WWW page with some tutorials on prolog?
Beginner level:
+ Adventure in Prolog:
http://www.amzi.com/AdventureInProlog/advfrtop.htm
+ On-line guide to Prolog Programming:
http://kti.ms.mff.cuni.cz/~bartak/prolog/index.html
+ Prolog Programming, A First Course:
http://computing.unn.ac.uk/staff/cgpb4/prologbook/book.html
+ Learn Prolog Now!:
http://www.coli.uni-sb.de/~kris/prolog-course/
+ Programmierkurs Prolog:
http://www.coli.uni-sb.de/cl/projects/indigen/prolog/ (In
German)
Intermediate to advanced level:
+ http://www.intranet.csupomona.edu/~jrfisher/www/prolog_tutori
al/pt_framer.html
_________________________________________________________________
A. Acknowledgements
Thank you to all the people who helped put together the first version of
this FAQ, and everyone who has contributed to it over the years. Special
thanks to John Dowding for suggesting a good format for the list, and to
Chris Moss, Dag Wahlberg, and Mark Kantrowitz for their work on the Prolog
Resource Guide.
Special thanks to Jamie Andrews and Dirk-Jan Faber, who have been
maintaining and posting the FAQ in the past.
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