Re: [xsl] xslt 2, grouping and more on indexing.

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="2.0" 
xmlns:dp="data:,dp"
exclude-result-prefixes="dp"
>
<xsl:output indent="yes"/>

<xsl:variable name="index" select="index"/>

<xsl:template match="index">
  <xsl:variable name="x">
  <xsl:for-each select="*">
  <xsl:copy>
   <xsl:apply-templates mode="x"/>
  </xsl:copy>
  </xsl:for-each>
  </xsl:variable>
  <head>INDEX</head>
        <xsl:for-each-group select="$x/*" group-starting-with="ientry1"      >
          <ientry1>
            <xsl:copy-of select="dp:sep(.)"/>
            <xsl:for-each-group select="current-group()[position()&gt;1]" 
                            group-starting-with="ientry2">
              <ientry2><xsl:copy-of select="dp:sep(text()[1])"/>
                <xsl:for-each-group
select="current-group()[position()&gt;1]" 
                  group-starting-with="ientry3">
                  <ientry3><xsl:copy-of select="dp:sep(text()[1])"/>
                  </ientry3>
                </xsl:for-each-group>
              </ientry2>
            </xsl:for-each-group> 
          </ientry1>
        </xsl:for-each-group>
</xsl:template>



<xsl:function name="dp:sep">
  <xsl:param name="ientry" as="node()*"/>
    <ent>
      <xsl:analyze-string select="$ientry" regex="([0-9][.0-9\-]*)" flags="s">
        <xsl:matching-substring>
          <r><xsl:value-of select="regex-group(1)"/></r>
        </xsl:matching-substring>
        <xsl:non-matching-substring>
          <xsl:analyze-string select="." regex="(Appendix .*$)" flags="s">
            <xsl:matching-substring>
              <r>
<xsl:analyze-string select="." regex="\[@@@@@@\]" flags="s">
<xsl:matching-substring>
<xsl:variable name="p" select="position()"/>
<xsl:copy-of
select="$index/*[count($ientry/preceding-sibling::*)+1]/node()[$p]"/>
</xsl:matching-substring>
<xsl:non-matching-substring>
<xsl:value-of select="."/>
</xsl:non-matching-substring>
</xsl:analyze-string>
              </r>
            </xsl:matching-substring>
           <xsl:non-matching-substring>
<xsl:analyze-string select="." regex="\[@@@@@@\]" flags="s">
<xsl:matching-substring>
<xsl:variable name="p" select="position()"/>
<xsl:copy-of
select="$index/*[count($ientry/preceding-sibling::*)+1]/node()[$p]"/>
</xsl:matching-substring>
<xsl:non-matching-substring>
<xsl:value-of select="."/>
</xsl:non-matching-substring>
</xsl:analyze-string>
            </xsl:non-matching-substring>
            </xsl:analyze-string>
          </xsl:non-matching-substring>
        </xsl:analyze-string>
</ent>
</xsl:function>

<xsl:template match="*" mode="x">
 <xsl:text>[@@@@@@]</xsl:text>
</xsl:template>

</xsl:stylesheet>



$ saxon8 index.xml index.xsl
<?xml version="1.0" encoding="UTF-8"?>
<head>INDEX</head>
<ientry1>
   <ent>INDEX</ent>
</ientry1>
<ientry1>
   <ent>abbreviation point</ent>
   <ientry2>
      <ent>and use of letter sign, <r>5.6.2</r>, <r>5.6.6</r>
      </ent>
   </ientry2>
   <ientry2>
      <ent>in abbreviations, <r>7.1.1-2</r>
      </ent>
   </ientry2>
   <ientry2>
      <ent>in designations, <r>5.6.14</r>
      </ent>
   </ientry2>
   <ientry2>
      <ent>in italicized abbreviations, <r>5.5.16</r>
      </ent>
   </ientry2>
   <ientry2>
      <ent>in personal initials, <r>7.1.6</r>
      </ent>
   </ientry2>
   <ientry2>
      <ent>in postcodes, <r>7.1.6</r>
      </ent>
   </ientry2>
   <ientry2>
      <ent>in reference abbreviations, <r>7.3.2-3</r>, <r>7.3.6</r>
      </ent>
   </ientry2>
   <ientry2>
      <ent>in references, <r>7.3.1-4</r>, <r>7.3.6</r>
      </ent>
   </ientry2>
   <ientry2>
      <ent>in Welsh, <r>Appendix I (E)</r>
      </ent>
      <ientry3>
         <ent>and elided vowels, <r>5.1.7</r>
         </ent>
      </ientry3>
      <ientry3>
         <ent>French, <r>Appendix II (A)</r>
         </ent>
      </ientry3>
      <ientry3>
         <ent>German, <r>Appendix II (B)</r>
         </ent>
      </ientry3>
      <ientry3>
         <ent>in foreign ordinal terminations, <r>6.6.2</r>, <r>6.7.5</r>
         </ent>
      </ientry3>
   </ientry2>
</ientry1>
<ientry1>
   <ent>French, <r>Appendix II (A); see also <i>accented letters</i>;
<i>accent sign</i>; <i>foreign, words and names</i>
      </r>
   </ent>
</ientry1>

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