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+<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="index.on.role">
+<refmeta>
+<refentrytitle>index.on.role</refentrytitle>
+<refmiscinfo class="other" otherclass="datatype">boolean</refmiscinfo>
+</refmeta>
+<refnamediv>
+<refname>index.on.role</refname>
+<refpurpose>Select indexterms based on <tag class="attribute">role</tag> value</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+<src:fragment xml:id="index.on.role.frag">
+<xsl:param name="index.on.role" select="0"/>
+</src:fragment>
+</refsynopsisdiv>
+
+<refsection><info><title>Description</title></info>
+
+<para>
+If non-zero, 
+then an <tag>index</tag> element that has a
+<tag class="attribute">role</tag> attribute
+value will contain only those <tag>indexterm</tag>
+elements with a matching role value.
+If an <tag>index</tag> has no <tag class="attribute">role</tag>
+attribute or it is blank, then the index will contain
+all <tag>indexterm</tag>s in the current scope.
+</para>
+<para>
+If <literal>index.on.role</literal> is zero, then the
+<tag class="attribute">role</tag> attribute has no effect
+on selecting indexterms for an index.
+</para>
+
+<para>If you are using DocBook version 4.3 or later, you should
+use the <tag class="attribute">type</tag> attribute instead of <tag class="attribute">role</tag>
+on <tag>indexterm</tag> and <tag>index</tag>,
+and set the <parameter>index.on.type</parameter> to a nonzero
+value.
+</para>
+
+</refsection>
+</refentry>