<refentry id="callouts.extension"> <refmeta> <refentrytitle>callouts.extension</refentrytitle> <refmiscinfo role="type">boolean</refmiscinfo> </refmeta> <refnamediv> <refname>callouts.extension</refname> <refpurpose>Enable the callout extension</refpurpose> </refnamediv> <refsynopsisdiv> <src:fragment id='callouts.extension.frag'><xsl:param name="callouts.extension" select="'1'"/></src:fragment> </refsynopsisdiv> <refsect1><title>Description</title> <para>The callouts extension processes <sgmltag>areaset</sgmltag> elements in <sgmltag>ProgramListingCO</sgmltag> and other text-based callout elements. </para> </refsect1> </refentry>