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<H1><A NAME="sec:7"><SPAN class="sec-nr">7</SPAN> <SPAN class="sec-title">CHR: 
Constraint Handling Rules</SPAN></A></H1>

<A NAME="sec:chr"></A>

<P>This chapter is written by Tom Schrijvers, K.U. Leuven, and 
adjustments by Jan Wielemaker.

<P>The CHR system of SWI-Prolog is the <EM>K.U.Leuven CHR system</EM>. 
The runtime environment is written by Christian Holzbaur and Tom 
Schrijvers while the compiler is written by Tom Schrijvers. Both are 
integrated with SWI-Prolog and licensed under compatible conditions with 
permission from the authors.

<P>The main reference for the K.U.Leuven CHR system is:
<UL class="latex">
<LI>T. Schrijvers, and B. Demoen, <EM>The K.U.Leuven CHR System: 
Implementation and Application</EM>, First Workshop on Constraint 
Handling Rules: Selected Contributions (Fr&uuml;hwirth, T. and Meister, 
M., eds.), pp. 1--5, 2004.
</UL>

<P>On the K.U.Leuven CHR website (<A class="url" href="http://www.cs.kuleuven.be/\~{}toms/CHR/">http://www.cs.kuleuven.be/\~{}toms/CHR/</A>) 
you can find more related papers, references and example programs.

<P>
<HR>
<CENTER>

<H2>Section Index</H2>

</CENTER>
<HR>
<DIV class="toc">
<DIV class="toc-h2"><A class="sec" href="chrintro.html"><SPAN class="sec-nr">7.1</SPAN> <SPAN class="sec-title">Introduction</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="SyntaxAndSemantics.html"><SPAN class="sec-nr">7.2</SPAN> <SPAN class="sec-title">Syntax 
and Semantics</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="SyntaxAndSemantics.html#sec:7.2.1"><SPAN class="sec-nr">7.2.1</SPAN> <SPAN class="sec-title">Syntax</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="SyntaxAndSemantics.html#sec:7.2.2"><SPAN class="sec-nr">7.2.2</SPAN> <SPAN class="sec-title">Semantics</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="practical.html"><SPAN class="sec-nr">7.3</SPAN> <SPAN class="sec-title">CHR 
in SWI-Prolog Programs</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="practical.html#sec:7.3.1"><SPAN class="sec-nr">7.3.1</SPAN> <SPAN class="sec-title">Embedding 
in Prolog Programs</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="practical.html#sec:7.3.2"><SPAN class="sec-nr">7.3.2</SPAN> <SPAN class="sec-title">Constraint 
declaration</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="practical.html#sec:7.3.3"><SPAN class="sec-nr">7.3.3</SPAN> <SPAN class="sec-title">Compilation</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="debugging.html"><SPAN class="sec-nr">7.4</SPAN> <SPAN class="sec-title">Debugging</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="debugging.html#sec:7.4.1"><SPAN class="sec-nr">7.4.1</SPAN> <SPAN class="sec-title">Ports</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="debugging.html#sec:7.4.2"><SPAN class="sec-nr">7.4.2</SPAN> <SPAN class="sec-title">Tracing</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="debugging.html#sec:7.4.3"><SPAN class="sec-nr">7.4.3</SPAN> <SPAN class="sec-title">CHR 
Debugging Predicates</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="examples.html"><SPAN class="sec-nr">7.5</SPAN> <SPAN class="sec-title">Examples</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="sicstus-chr.html"><SPAN class="sec-nr">7.6</SPAN> <SPAN class="sec-title">Backwards 
Compatibility</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="sicstus-chr.html#sec:7.6.1"><SPAN class="sec-nr">7.6.1</SPAN> <SPAN class="sec-title">The 
Old SICStus CHR implemenation</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="sicstus-chr.html#sec:7.6.2"><SPAN class="sec-nr">7.6.2</SPAN> <SPAN class="sec-title">The 
Old ECLiPSe CHR implemenation</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="guidelines.html"><SPAN class="sec-nr">7.7</SPAN> <SPAN class="sec-title">Programming 
Tips and Tricks</SPAN></A></DIV>
<DIV class="toc-h2"><A class="sec" href="errors.html"><SPAN class="sec-nr">7.8</SPAN> <SPAN class="sec-title">Compiler 
Errors and Warnings</SPAN></A></DIV>
<DIV class="toc-h3"><A class="sec" href="errors.html#sec:7.8.1"><SPAN class="sec-nr">7.8.1</SPAN> <SPAN class="sec-title">CHR 
Compiler Errors</SPAN></A></DIV>
</DIV>
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