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+<?xml version='1.0'?>
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+                version='1.0'>
+
+<!-- ********************************************************************
+     $Id: index.xsl 8421 2009-05-04 07:49:49Z bobstayton $
+     ********************************************************************
+
+     This file is part of the XSL DocBook Stylesheet distribution.
+     See ../README or http://docbook.sf.net/release/xsl/current/ for
+     copyright and other information.
+
+     ******************************************************************** -->
+
+<!-- ==================================================================== -->
+
+<xsl:template match="index">
+  <!-- some implementations use completely empty index tags to indicate -->
+  <!-- where an automatically generated index should be inserted. so -->
+  <!-- if the index is completely empty, skip it. Unless generate.index -->
+  <!-- is non-zero, in which case, this is where the automatically -->
+  <!-- generated index should go. -->
+
+  <xsl:call-template name="id.warning"/>
+
+  <xsl:if test="count(*)>0 or $generate.index != '0'">
+    <div>
+      <xsl:apply-templates select="." mode="common.html.attributes"/>
+      <xsl:if test="$generate.id.attributes != 0">
+        <xsl:attribute name="id">
+          <xsl:call-template name="object.id"/>
+        </xsl:attribute>
+      </xsl:if>
+
+      <xsl:call-template name="index.titlepage"/>
+      <xsl:choose>
+	<xsl:when test="indexdiv">
+	  <xsl:apply-templates/>
+	</xsl:when>
+	<xsl:otherwise>
+	  <xsl:apply-templates select="*[not(self::indexentry)]"/>
+	  <!-- Because it's actually valid for Index to have neither any -->
+	  <!-- Indexdivs nor any Indexentries, we need to check and make -->
+	  <!-- sure that at least one Indexentry exists, and generate a -->
+	  <!-- wrapper dl if there is at least one; otherwise, do nothing. -->
+	  <xsl:if test="indexentry">
+	    <!-- The indexentry template assumes a parent dl wrapper has -->
+	    <!-- been generated; for Indexes that have Indexdivs, the dl -->
+	    <!-- wrapper is generated by the indexdiv template; however, -->
+	    <!-- for Indexes that lack Indexdivs, if we don't generate a -->
+	    <!-- dl here, HTML output will not be valid. -->
+	    <dl>
+	      <xsl:apply-templates select="indexentry"/>
+	    </dl>
+	  </xsl:if>
+	</xsl:otherwise>
+      </xsl:choose>
+
+      <xsl:if test="count(indexentry) = 0 and count(indexdiv) = 0">
+        <xsl:call-template name="generate-index">
+          <xsl:with-param name="scope" select="(ancestor::book|/)[last()]"/>
+        </xsl:call-template>
+      </xsl:if>
+
+      <xsl:if test="not(parent::article)">
+        <xsl:call-template name="process.footnotes"/>
+      </xsl:if>
+    </div>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="setindex">
+  <!-- some implementations use completely empty index tags to indicate -->
+  <!-- where an automatically generated index should be inserted. so -->
+  <!-- if the index is completely empty, skip it. Unless generate.index -->
+  <!-- is non-zero, in which case, this is where the automatically -->
+  <!-- generated index should go. -->
+
+  <xsl:call-template name="id.warning"/>
+
+  <xsl:if test="count(*)>0 or $generate.index != '0'">
+    <div>
+      <xsl:apply-templates select="." mode="common.html.attributes"/>
+      <xsl:if test="$generate.id.attributes != 0">
+        <xsl:attribute name="id">
+          <xsl:call-template name="object.id"/>
+        </xsl:attribute>
+      </xsl:if>
+
+      <xsl:call-template name="setindex.titlepage"/>
+      <xsl:apply-templates/>
+
+      <xsl:if test="count(indexentry) = 0 and count(indexdiv) = 0">
+        <xsl:call-template name="generate-index">
+          <xsl:with-param name="scope" select="/"/>
+        </xsl:call-template>
+      </xsl:if>
+
+      <xsl:if test="not(parent::article)">
+        <xsl:call-template name="process.footnotes"/>
+      </xsl:if>
+    </div>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="index/indexinfo"></xsl:template>
+<xsl:template match="index/info"></xsl:template>
+<xsl:template match="index/title"></xsl:template>
+<xsl:template match="index/subtitle"></xsl:template>
+<xsl:template match="index/titleabbrev"></xsl:template>
+
+<!-- ==================================================================== -->
+
+<xsl:template match="indexdiv">
+  <xsl:call-template name="id.warning"/>
+
+  <div>
+    <xsl:apply-templates select="." mode="common.html.attributes"/>
+    <xsl:if test="$generate.id.attributes != 0">
+      <xsl:attribute name="id">
+        <xsl:call-template name="object.id"/>
+      </xsl:attribute>
+    </xsl:if>
+
+    <xsl:call-template name="anchor"/>
+    <xsl:apply-templates select="*[not(self::indexentry)]"/>
+    <dl>
+      <xsl:apply-templates select="indexentry"/>
+    </dl>
+  </div>
+</xsl:template>
+
+<xsl:template match="indexdiv/title">
+  <h3>
+    <xsl:apply-templates select="." mode="common.html.attributes"/>
+    <xsl:apply-templates/>
+  </h3>
+</xsl:template>
+
+<!-- ==================================================================== -->
+
+<xsl:template match="indexterm">
+  <!-- this one must have a name, even if it doesn't have an ID -->
+  <xsl:variable name="id">
+    <xsl:call-template name="object.id"/>
+  </xsl:variable>
+
+  <a class="indexterm" name="{$id}"/>
+</xsl:template>
+
+<xsl:template match="primary|secondary|tertiary|see|seealso">
+</xsl:template>
+
+<!-- ==================================================================== -->
+
+<xsl:template match="indexentry">
+  <xsl:apply-templates select="primaryie"/>
+</xsl:template>
+
+<xsl:template match="primaryie">
+  <dt>
+    <xsl:apply-templates/>
+  </dt>
+  <dd>
+    <xsl:apply-templates select="following-sibling::seeie
+                                   [not(preceding-sibling::secondaryie)]"
+                         mode="indexentry"/>
+    <xsl:apply-templates select="following-sibling::seealsoie
+                                   [not(preceding-sibling::secondaryie)]"
+                         mode="indexentry"/>
+    <xsl:apply-templates select="following-sibling::secondaryie"
+                         mode="indexentry"/>
+  </dd>
+</xsl:template>
+
+<!-- Handled in mode to convert flat list to structured output -->
+<xsl:template match="secondaryie">
+</xsl:template>
+<xsl:template match="tertiaryie">
+</xsl:template>
+<xsl:template match="seeie|seealsoie">
+</xsl:template>
+
+<xsl:template match="secondaryie" mode="indexentry">
+  <dl>
+    <dt>
+      <xsl:apply-templates/>
+    </dt>
+    <dd>
+      <!-- select following see* elements up to next secondaryie or tertiary or end -->
+      <xsl:variable name="after.this"
+              select="following-sibling::*"/>
+      <xsl:variable name="next.entry"
+              select="(following-sibling::secondaryie|following-sibling::tertiaryie)[1]"/>
+      <xsl:variable name="before.entry"
+                    select="$next.entry/preceding-sibling::*"/>
+      <xsl:variable name="see.intersection"
+             select="$after.this[count(.|$before.entry) = count($before.entry)]
+                                [self::seeie or self::seealsoie]"/>
+      <xsl:choose>
+        <xsl:when test="count($see.intersection) != 0">
+          <xsl:apply-templates select="$see.intersection" mode="indexentry"/>
+        </xsl:when>
+        <xsl:when test="count($next.entry) = 0">
+          <xsl:apply-templates select="following-sibling::seeie"
+                               mode="indexentry"/>
+          <xsl:apply-templates select="following-sibling::seealsoie"
+                               mode="indexentry"/>
+        </xsl:when>
+      </xsl:choose>
+
+      <!-- now process any tertiaryie before the next secondaryie -->
+      <xsl:variable name="before.next.secondary" 
+              select="following-sibling::secondaryie[1]/preceding-sibling::*"/>
+      <xsl:variable name="tertiary.intersection"
+             select="$after.this[count(.|$before.next.secondary) = 
+                                 count($before.next.secondary)]
+                                [not(self::seeie) and not(self::seealsoie)]"/>
+      <xsl:choose>
+        <xsl:when test="count($tertiary.intersection) != 0">
+          <xsl:apply-templates select="$tertiary.intersection"
+                               mode="indexentry"/>
+        </xsl:when>
+        <xsl:when test="not(following-sibling::secondaryie)">
+          <xsl:apply-templates select="following-sibling::tertiaryie"
+                               mode="indexentry"/>
+        </xsl:when>
+      </xsl:choose>
+    </dd>
+  </dl>
+</xsl:template>
+
+<xsl:template match="tertiaryie" mode="indexentry">
+  <dl>
+    <dt>
+      <xsl:apply-templates/>
+    </dt>
+    <dd>
+      <!-- select following see* elements up to next secondaryie or tertiary or end -->
+      <xsl:variable name="after.this"
+              select="following-sibling::*"/>
+      <xsl:variable name="next.entry"
+              select="(following-sibling::secondaryie|following-sibling::tertiaryie)[1]"/>
+      <xsl:variable name="before.entry"
+                    select="$next.entry/preceding-sibling::*"/>
+      <xsl:variable name="see.intersection"
+             select="$after.this[count(.|$before.entry) = count($before.entry)]
+                                [self::seeie or self::seealsoie]"/>
+      <xsl:choose>
+        <xsl:when test="count($see.intersection) != 0">
+          <xsl:apply-templates select="$see.intersection" mode="indexentry"/>
+        </xsl:when>
+        <xsl:when test="count($next.entry) = 0">
+          <xsl:apply-templates select="following-sibling::seeie"
+                               mode="indexentry"/>
+          <xsl:apply-templates select="following-sibling::seealsoie"
+                               mode="indexentry"/>
+        </xsl:when>
+      </xsl:choose>
+    </dd>
+  </dl>
+</xsl:template>
+
+<xsl:template match="seeie" mode="indexentry">
+  <dt>
+    <xsl:text>(</xsl:text>
+    <xsl:call-template name="gentext">
+      <xsl:with-param name="key" select="'see'"/>
+    </xsl:call-template>
+    <xsl:text> </xsl:text>
+    <xsl:apply-templates/>
+    <xsl:text>)</xsl:text>
+  </dt>
+</xsl:template>
+
+<xsl:template match="seealsoie" mode="indexentry">
+  <div>
+    <xsl:text>(</xsl:text>
+    <xsl:call-template name="gentext">
+      <xsl:with-param name="key" select="'seealso'"/>
+    </xsl:call-template>
+    <xsl:text> </xsl:text>
+    <xsl:apply-templates/>
+    <xsl:text>)</xsl:text>
+  </div>
+</xsl:template>
+
+</xsl:stylesheet>