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Re: [xsl] position behavior in nested grouping

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Ganesh Babu N wrote:

all those should be clubbed into single section by taking group-adjcent.

The output should be

                       <sections>
                              <section-title>Contents</section-title>
                          <section>
                               <section-head>Abstracts of the Series
of Fascia Congress - Part
4</section-head>
                               <para>
                                       <page>270</page>
                               </para>
                          </section>
                         <section>
                            <section-head/>
                              <para>
                                       <page>271</page>
                               </para>
                               <para>
                                       <page>271</page>
                               </para>
                          </section>
                          <section>
                               <section-head>Abstracts of the Series
of Fascia Congress - Part
4</section-head>
                               <para>
                                       <page>272</page>
                               </para>
                       </section>
                       <section>
                               <section-head>Prevention &amp;
Rehabilitation</section-head>
                               <section-subhead>Editorial</section-subhead>
                               <para>
                                       <page>273</page>
                               </para>
                               <para>
                                       <page>277</page>
                               </para>
                       </section>
                       <section>
                               <section-subhead>Learning
Methodology</section-subhead>
                               <para>
                                       <page>284</page>
                               </para>
                       </section>
               </sections>

If you know that you want group-adjacent then it is only a slight change from the earlier stylesheet:

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

<xsl:output indent="yes"/>

<xsl:template match="articles">
<sections>
<section-title>Contents</section-title>
<xsl:for-each-group select="row" group-adjacent="if (col[2] = '') then '' else tokenize(col[2], '\|')[1]">
<xsl:choose>
<xsl:when test="contains(col[2], '|')">
<xsl:variable name="outer-key" select="current-grouping-key()"/>
<xsl:for-each-group select="current-group()" group-by="tokenize(col[2], '\|')[2]">
<section>
<xsl:if test="position() eq 1">
<section-head><xsl:value-of select="$outer-key"/></section-head>
</xsl:if>
<section-subhead><xsl:value-of select="current-grouping-key()"/></section-subhead>
<xsl:apply-templates select="current-group()"/>
</section>
</xsl:for-each-group>
</xsl:when>
<xsl:otherwise>
<section>
<section-head><xsl:value-of select="current-grouping-key()"/></section-head>
<xsl:apply-templates select="current-group()"/>
</section>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each-group>
</sections>
</xsl:template>

  <xsl:template match="row">
    <para>
      <page><xsl:value-of select="col[3]"/></page>
    </para>
  </xsl:template>
</xsl:stylesheet>

The problem why the previous solution skips the row elements with an empty col[2] child element is that the tokenize function returns an empty sequence for the empty string and that does not result in a group. But group-adjacent="if (col[2] = '') then '' else tokenize(col[2], '\|')[1]" avoids that problem and simply form a group for those elements with an empty col[2].

--

	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/

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