<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>