Re: [xsl] Sorting things on two levels

Michele R Combs mrrothen(_at_)syr(_dot_)edu wrote:

> > Looks like grouping and sorting to me. Do you use XSLT 1.0 or 2.0?
>
> I'll be running the transform using the latest version of Oxygen, so it looks 
> like either would be fine.  From the Oxygen Help file:
With XSLT 2.0 here is an approach:

<xsl:stylesheet version="2.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
  xmlns:xs="http://www.w3.org/2001/XMLSchema";
  exclude-result-prefixes="xs">

<xsl:output method="html" indent="yes"/>

<xsl:template match="root">
  <ul>
    <xsl:for-each-group select="indexterm" group-by="primary">
      <xsl:sort select="current-grouping-key()"/>
      <li>
        <xsl:value-of select="current-grouping-key(), if 
(not(current-group()/secondary)) then current-group()/@id else ()" 
separator=", "/>
        <xsl:if test="current-group()/secondary">
          <ul>
            <xsl:for-each-group select="current-group()" 
group-by="secondary">
              <xsl:sort select="current-grouping-key()"/>
              <li>
                <xsl:value-of select="current-grouping-key(), 
current-group()/@id" separator=", "/>
              </li>
            </xsl:for-each-group>
          </ul>
        </xsl:if>
      </li>
    </xsl:for-each-group>
  </ul>
</xsl:template>

</xsl:stylesheet>

Outputs

<ul>
   <li>aardvarks, {ID}</li>
   <li>bears
      <ul>
         <li>breeding, {ID}</li>
         <li>feeding, {ID}</li>
         <li>hunting, {ID}, {ID}</li>
      </ul>
   </li>
</ul>

for your sample data.
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