<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="preferred.mediaobject.role"> <refmeta> <refentrytitle>preferred.mediaobject.role</refentrytitle> <refmiscinfo class="other" otherclass="datatype">string</refmiscinfo> </refmeta> <refnamediv> <refname>preferred.mediaobject.role</refname> <refpurpose>Select which mediaobject to use based on this value of an object's <tag class="attribute">role</tag> attribute. </refpurpose> </refnamediv> <refsynopsisdiv> <src:fragment xml:id="preferred.mediaobject.role.frag"> <xsl:param name="preferred.mediaobject.role"/> </src:fragment> </refsynopsisdiv> <refsection><info><title>Description</title></info> <para>A mediaobject may contain several objects such as imageobjects. If the parameter <parameter>use.role.for.mediaobject</parameter> is non-zero, then the <literal>role</literal> attribute on <tag>imageobject</tag>s and other objects within a <tag>mediaobject</tag> container will be used to select which object will be used. If one of the objects has a role value that matches the <parameter>preferred.mediaobject.role</parameter> parameter, then it has first priority for selection. If more than one has such a role value, the first one is used. </para> <para> See the <parameter>use.role.for.mediaobject</parameter> parameter for the sequence of selection.</para> </refsection> </refentry>