<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="use.role.for.mediaobject"> <refmeta> <refentrytitle>use.role.for.mediaobject</refentrytitle> <refmiscinfo class="other" otherclass="datatype">boolean</refmiscinfo> </refmeta> <refnamediv> <refname>use.role.for.mediaobject</refname> <refpurpose>Use <tag class="attribute">role</tag> attribute value for selecting which of several objects within a mediaobject to use. </refpurpose> </refnamediv> <refsynopsisdiv> <src:fragment xml:id="use.role.for.mediaobject.frag"> <xsl:param name="use.role.for.mediaobject" select="1"/> </src:fragment> </refsynopsisdiv> <refsection><info><title>Description</title></info> <para>If non-zero, the <tag class="attribute">role</tag> attribute on <tag>imageobject</tag>s or other objects within a <tag>mediaobject</tag> container will be used to select which object will be used. </para> <para> The order of selection when then parameter is non-zero is: </para> <orderedlist> <listitem> <para>If the stylesheet parameter <parameter>preferred.mediaobject.role</parameter> has a value, then the object whose role equals that value is selected.</para> </listitem> <listitem> <para>Else if an object's role attribute has a value of <literal>html</literal> for HTML processing or <literal>fo</literal> for FO output, then the first of such objects is selected. </para> </listitem> <listitem> <para>Else the first suitable object is selected.</para> </listitem> </orderedlist> <para> If the value of <parameter>use.role.for.mediaobject</parameter> is zero, then role attributes are not considered and the first suitable object with or without a role value is used. </para> </refsection> </refentry>