Re: [xsl] Grouping Problems XSLT2.0

I don't know, there's something about the grouping attributes in
xsl-for-each-group I just don't seem to get, perhaps Michael could
comment?
Most of XSLT2 I just absorb and hardly ever refer to the spec, but I
_always_ have to check up the definition of for-each-group to check
which grouping attributes take a pattern, and which take an expression.
In the example below, the first, using group-adjacent, takes an
expression, but the second, using group-starting-with takes a pattern.
As is usally the case I got that wrong first time round. I must be
missing the "idea" behind this split, usually with XSL if you think
about things the right way, the xslt solution seesm perfectly natural,
it's just a matter of getting the brain to think the right way....


David



<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
  <xsl:output indent="yes"/>

  <xsl:template match="section">
    <section>
      <xsl:for-each-group select="para" 
group-adjacent="replace(@class,'source','para')">
        <xsl:choose>
          <xsl:when test="current-grouping-key() = 'epigraphpara'">
            <epigraph>
              <xsl:apply-templates select="current-group()"/>
            </epigraph>
          </xsl:when>
          <xsl:otherwise>
            <xsl:for-each-group select="current-group()" 
group-starting-with="para[inline[ends-with(@class,'title')]]">
            <subsection>
              <title><xsl:apply-templates select="."/></title>
              <xsl:apply-templates select="current-group()[position()!=1]"/>
            </subsection>
            </xsl:for-each-group>
          </xsl:otherwise>      
        </xsl:choose>
      </xsl:for-each-group>
    </section>
  </xsl:template>

  <xsl:template match="*">
    <xsl:copy>
      <xsl:copy-of select="@*"/>
      <xsl:apply-templates/>
    </xsl:copy>
  </xsl:template>


 
</xsl:stylesheet>




$ saxon8 epi.xml epi.xsl
<?xml version="1.0" encoding="UTF-8"?>
<section>
   <epigraph>
      <para class="epigraphpara">...</para>
      <para class="epigraphpara">...</para>
      <para class="epigraphpara">...</para>
      <para class="epigraphpara">...</para>
      <para class="epigraphsource">...</para>
   </epigraph>
   <subsection>
      <title>
         <para class="subsection1para">
            <inline class="subsection1title">...</inline>
         </para>
      </title>
      <para class="subsection1para">...</para>
      <para class="subsection1para">...</para>
      <para class="subsection1para">...</para>
      <para class="subsection1para">...</para>
      <para class="subsection1para">...</para>
      <para class="subsection1para">...</para>
      <para class="subsection1para">...</para>
      <para class="subsection1para">...</para>
   </subsection>
   <subsection>
      <title>
         <para class="subsection1para">
            <inline class="subsection1title">...</inline>
         </para>
      </title>
      <para class="subsection1para">...</para>
      <para class="subsection1para">...</para>
      <para class="subsection1para">...</para>
      <para class="subsection1para">...</para>
   </subsection>
</section>

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