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<refentry id="index.on.type">
<refmeta>
<refentrytitle>index.on.type</refentrytitle>
<refmiscinfo role="type">boolean</refmiscinfo>
</refmeta>
<refnamediv>
<refname>index.on.type</refname>
<refpurpose>Select indexterms based on <sgmltag>type</sgmltag>
attribute value</refpurpose>
</refnamediv>
<refsynopsisdiv>
<src:fragment id='index.on.type.frag'>
<xsl:param name="index.on.type" select="0"/>
</src:fragment>
</refsynopsisdiv>
<refsect1><title>Description</title>
<para>
If non-zero,
then an <sgmltag>index</sgmltag> element that has a
<sgmltag>type</sgmltag> attribute
value will contain only those <sgmltag>indexterm</sgmltag>
elements with a matching <sgmltag>type</sgmltag> attribute value.
If an <sgmltag>index</sgmltag> has no <sgmltag>type</sgmltag>
attribute or it is blank, then the index will contain
all <sgmltag>indexterm</sgmltag>s in the current scope.
</para>
<para>
If <literal>index.on.type</literal> is zero, then the
<sgmltag>type</sgmltag> attribute has no effect
on selecting indexterms for an index.
</para>
<para>For those using DocBook version 4.2 or earlier,
the <sgmltag>type</sgmltag> attribute is not available
for index terms. However, you can achieve the same
effect by using the <sgmltag>role</sgmltag> attribute
in the same manner on <sgmltag>indexterm</sgmltag>
and <sgmltag>index</sgmltag>, and setting the stylesheet parameter
<parameter>index.on.role</parameter> to a nonzero value.
</para>
</refsect1>
</refentry>
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