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<refentry xmlns=""
          version="5.0" xml:id="preferred.mediaobject.role">
<refmiscinfo class="other" otherclass="datatype">string</refmiscinfo>
<refpurpose>Select which mediaobject to use based on
this value of an object's <tag class="attribute">role</tag> attribute.

<src:fragment xml:id="preferred.mediaobject.role.frag">
<xsl:param name="preferred.mediaobject.role"/>


<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.
See the <parameter>use.role.for.mediaobject</parameter> parameter
for the sequence of selection.</para>
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