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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

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<head>
<title>SWI-Prolog 7.1.16 Reference Manual</title><link rel="contents" href="Contents.html">
<link rel="index" href="DocIndex.html">
<link rel="summary" href="summary.html">
<link rel="next" href="Contents.html">

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<div class="navigate"><a class="nav" href="Contents.html"><img src="index.gif" alt="Contents"></a>
<a class="nav" href="DocIndex.html"><img src="yellow_pages.gif" alt="Index"></a>
<a class="nav" href="summary.html"><img src="info.gif" alt="Summary"></a>
<a class="nav" href="Contents.html"><img src="next.gif" alt="Next"></a>
</div>
<div class="title">SWI-Prolog 7.1.16 Reference Manual</div>
<div class="author"><a class="url" href="mailto:J.Wielemaker@vu.nl">Jan 
Wielemaker</a> <br>
Department of Computer Science <br>
VU University Amsterdam <br>
De Boelelaan 1081a, 1081 HV&nbsp;&nbsp;Amsterdam 

<p><br>
Human-Computer Studies (HCS, formerly SWI) <br>
Kruislaan 419, 1098 VA&nbsp;&nbsp;Amsterdam <br>
The Netherlands</div>
<div class="abstract">
<div class="abstract-title">Abstract</div> SWI-Prolog is a comprehensive 
and portable implementation of the Prolog programming language. 
SWI-Prolog aims to be a robust and scalable implementation supporting a 
wide range of applications. In particular, it ships with a wide range of 
interface libraries, providing interfaces to other languages, databases, 
graphics and networking. It provides extensive support for managing 
HTML/SGML/XML and RDF documents. The system is particularly suited for 
server applications due to robust support for multithreading and HTTP 
server libraries.

<p>SWI-Prolog is designed in the `Edinburgh tradition'. In addition to 
the ISO Prolog standard it is largely compatible to Quintus, SICStus and 
YAP Prolog. SWI-Prolog provides a compatibility framework developed in 
cooperation with YAP and instantiated for YAP, SICStus and IF/Prolog.

<p>SWI-Prolog aims at providing a good development environment, 
including extensive editor support, graphical source-level debugger, 
autoloading and `make' facility and much more. SWI-Prolog editor and the 
PDT plugin for Eclipse provide alternative environments.

<p>This document gives an overview of the features, system limits and 
built-in predicates.
</div>

<h3>About this document</h3>

<p>This manual is written and maintained using LaTeX . The LaTeX source 
is included in the source distribution of SWI-Prolog. The manual is 
converted into HTML using a converter distributed with the SWI-Prolog 
sources. From the same source we generate the plain-text version and 
index used by the online help system (located in the file <code>MANUAL</code> 
in the library directory) as well as the PDF version. Sources, binaries 
and documentation can be downloaded from the <a class="url" href="http://www.swi-prolog.org/download.html">SWI-Prolog 
download page</a>.

<p>The SWI-Prolog project <b>home page</b> is located
<a class="url" href="http://www.swi-prolog.org">here</a>

<p><img src="by-sa.png">

<p>This work is licensed under the Creative Commons 
Attribution-ShareAlike 3.0 Unported License. To view a copy of this 
license, visit
<a class="url" href="http://creativecommons.org/licenses/by-sa/3.0/">http://creativecommons.org/licenses/by-sa/3.0/</a> 
or send a letter to Creative Commons, 444 Castro Street, Suite 900, 
Mountain View, California, 94041, USA.

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