Re: [xsl] position behavior in nested grouping

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Subject: Re: position behavior in nested grouping
From: Martin Honnen <Martin.Honnen@xxxxxx>
Date: Thu, 30 Jul 2009 15:42:18 +0200

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/

Current Thread
Re: position behavior in nested grouping, (continued) Martin Honnen - 15 Jul 2009 12:50:41 -0000 Ganesh Babu N - 30 Jul 2009 12:40:22 -0000 Martin Honnen - 30 Jul 2009 12:47:00 -0000 Ganesh Babu N - 30 Jul 2009 12:57:46 -0000 Martin Honnen - 30 Jul 2009 13:42:48 -0000 <= Ganesh Babu N - 31 Jul 2009 04:18:53 -0000

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