<refentry id="constraintdef.element" revision='EBNF'>
<?dbhtml filename="constraintdef.html"?>
<refentryinfo>
<pubdate>$Date$</pubdate>
<releaseinfo>$Revision$</releaseinfo>
</refentryinfo>

<refmeta>
<indexterm><primary>elements</primary>
<secondary>constraintdef</secondary></indexterm>
<refentrytitle>constraintdef</refentrytitle>
<refmiscinfo>Element</refmiscinfo>
</refmeta>
<refnamediv>
<refname>constraintdef</refname>
<refpurpose>&constraintdef.purpose;</refpurpose>
</refnamediv>

&constraintdef.synopsis.gen;
<refsect1 condition='ref.description'><title>Description</title>

<para>This element is only available if you are using the
<link linkend="ebnf.module">EBNF Module</link>.</para>

<para>A <sgmltag>ConstraintDef</sgmltag> contains a description of a
constraint that cannot be expressed in the grammar (generally logical
rather than syntactic constraints).</para>

<refsect2><title>Processing expectations</title>
<para>
&format.block;
</para>
</refsect2>


&constraintdef.parents.gen;
&constraintdef.children.gen;
</refsect1>
<refsect1><title>Examples</title>

&constraintdef.example.seealso.gen;
</refsect1>
</refentry>

