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+<refentry xmlns="http://docbook.org/ns/docbook"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+ xmlns:xi="http://www.w3.org/2001/XInclude"
+ xmlns:src="http://nwalsh.com/xmlns/litprog/fragment"
+ xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+ version="5.0" xml:id="saxon.callouts">
+<refmeta>
+<refentrytitle>saxon.callouts</refentrytitle>
+<refmiscinfo class="other" otherclass="datatype">boolean</refmiscinfo>
+</refmeta>
+<refnamediv>
+<refname>saxon.callouts</refname>
+<refpurpose>Enable the callout extension</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+<src:fragment xml:id="saxon.callouts.frag">
+<xsl:param name="saxon.callouts" select="1"/>
+</src:fragment>
+</refsynopsisdiv>
+
+<refsection><info><title>Description</title></info>
+
+<para>The callouts extension processes <tag>areaset</tag>
+elements in <tag>ProgramListingCO</tag> and other text-based
+callout elements.
+</para>
+
+</refsection>
+</refentry>