Fix bug that omitted duplicate indexterms in the same section but

with different zone attributes, which should not be omitted.

xsl/html/autoidx.xsl

@@ -307,7 +307,7 @@
     <xsl:value-of select="primary"/>
     <xsl:choose>
       <xsl:when test="$index.links.to.section = 1">
-        <xsl:for-each select="$refs[generate-id() = generate-id(key('primary-section', concat($key, &sep;, &section.id;))[&scope;][1])]">
+        <xsl:for-each select="$refs[@zone != '' or generate-id() = generate-id(key('primary-section', concat($key, &sep;, &section.id;))[&scope;][1])]">
           <xsl:apply-templates select="." mode="reference">
             <xsl:with-param name="position" select="position()"/>
             <xsl:with-param name="scope" select="$scope"/>
@@ -380,7 +380,7 @@
     <xsl:value-of select="secondary"/>
     <xsl:choose>
       <xsl:when test="$index.links.to.section = 1">
-        <xsl:for-each select="$refs[generate-id() = generate-id(key('secondary-section', concat($key, &sep;, &section.id;))[&scope;][1])]">
+        <xsl:for-each select="$refs[@zone != '' or generate-id() = generate-id(key('secondary-section', concat($key, &sep;, &section.id;))[&scope;][1])]">
           <xsl:apply-templates select="." mode="reference">
             <xsl:with-param name="position" select="position()"/>
             <xsl:with-param name="scope" select="$scope"/>
@@ -453,7 +453,7 @@
     <xsl:value-of select="tertiary"/>
     <xsl:choose>
       <xsl:when test="$index.links.to.section = 1">
-        <xsl:for-each select="$refs[generate-id() = generate-id(key('tertiary-section', concat($key, &sep;, &section.id;))[&scope;][1])]">
+        <xsl:for-each select="$refs[@zone != '' or generate-id() = generate-id(key('tertiary-section', concat($key, &sep;, &section.id;))[&scope;][1])]">
           <xsl:apply-templates select="." mode="reference">
             <xsl:with-param name="position" select="position()"/>
             <xsl:with-param name="scope" select="$scope"/>