 function followed by the arguments.  For a complete discussion of the expression grammar and semantics, see (<a href="reference.txt">reference.txt</a>) (<a href="reference.html">HTML</a>).</p>
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<h2 id="_action_code_predicate_code">Action: <code>predicate</code></h2>
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<p>The <code>predicate</code> action indicates that a rule should be handled by predicate.  The argument to the action should be an s-expression to attach