1 <refentry xmlns="http://docbook.org/ns/docbook"
2 xmlns:xlink="http://www.w3.org/1999/xlink"
3 xmlns:xi="http://www.w3.org/2001/XInclude"
4 xmlns:src="http://nwalsh.com/xmlns/litprog/fragment"
5 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
6 version="5.0" xml:id="use.role.for.mediaobject">
8 <refentrytitle>use.role.for.mediaobject</refentrytitle>
9 <refmiscinfo class="other" otherclass="datatype">boolean</refmiscinfo>
12 <refname>use.role.for.mediaobject</refname>
13 <refpurpose>Use <tag class="attribute">role</tag> attribute
14 value for selecting which of several objects within a mediaobject to use.
19 <src:fragment xml:id="use.role.for.mediaobject.frag">
20 <xsl:param name="use.role.for.mediaobject" select="1"/>
24 <refsection><info><title>Description</title></info>
26 <para>If non-zero, the <tag class="attribute">role</tag> attribute on
27 <tag>imageobject</tag>s or other objects within a <tag>mediaobject</tag> container will be used to select which object will be
31 The order of selection when then parameter is non-zero is:
35 <para>If the stylesheet parameter <parameter>preferred.mediaobject.role</parameter> has a value, then the object whose role equals that value is selected.</para>
38 <para>Else if an object's role attribute has a value of
39 <literal>html</literal> for HTML processing or
40 <literal>fo</literal> for FO output, then the first
41 of such objects is selected.
45 <para>Else the first suitable object is selected.</para>
50 <parameter>use.role.for.mediaobject</parameter>
51 is zero, then role attributes are not considered
52 and the first suitable object
53 with or without a role value is used.