Re: [xsl] how to group nodes by id?

Subject: Re: [xsl] how to group nodes by id?
From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 02 Dec 2002 11:34:33 -0500
At 2002-12-02 07:48 -0800, Artur Matysiak wrote:
does anybody know how to convert the following XML:

Below is a solution using variables and a solution using keys. Take your pick. Grouping algorithms are documented in the FAQ ... what aspects of the documentation did you find confusing?


I hope this helps.

...................... Ken

T:\ftemp>type artur.xml
<elems>
 <elem id="1">
  <elem id="1"/>
 </elem>
 <elem id="1">
  <elem id="2"/>
 </elem>
 <elem id="2">
  <elem id="1"/>
 </elem>
 <elem id="2">
  <elem id="2"/>
 </elem>
</elems>

T:\ftemp>type artur.xsl
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="1.0">

<xsl:output indent="yes"/>

<xsl:template match="elems">
  <elems>
    <xsl:variable name="elem-children" select="elem"/>
    <xsl:for-each select="$elem-children">
      <xsl:if test="generate-id(.)=
                    generate-id($elem-children[@id=current()/@id])">
        <xsl:copy>
          <xsl:copy-of select="@*"/>
          <xsl:copy-of select="$elem-children[@id=current()/@id]/node()"/>
        </xsl:copy>
      </xsl:if>
    </xsl:for-each>
  </elems>
</xsl:template>

</xsl:stylesheet>

T:\ftemp>xt artur.xml artur.xsl
<?xml version="1.0" encoding="utf-8"?>
<elems>
<elem id="1">
  <elem id="1"/>

  <elem id="2"/>
 </elem>
<elem id="2">
  <elem id="1"/>

  <elem id="2"/>
 </elem>
</elems>

T:\ftemp>type artur2.xsl
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="1.0">

<xsl:output indent="yes"/>

<xsl:key name="elems" match="elem[elem]" use="@id"/>

<xsl:template match="elems">
  <elems>
    <xsl:for-each select="elem[generate-id(.)=generate-id(key('elems',@id))]">
      <xsl:copy>
        <xsl:copy-of select="@*"/>
        <xsl:copy-of select="key('elems',@id)/node()"/>
      </xsl:copy>
    </xsl:for-each>
  </elems>
</xsl:template>

</xsl:stylesheet>

T:\ftemp>saxon artur.xml artur2.xsl
<?xml version="1.0" encoding="utf-8"?>
<elems>
   <elem id="1">

<elem id="1"/>


<elem id="2"/>


   </elem>
   <elem id="2">

<elem id="1"/>


<elem id="2"/>


   </elem>
</elems>
T:\ftemp>

T:\ftemp>


-- Upcoming hands-on in-depth XSLT/XPath and/or XSL-FO: - North America: Feb 3 - Feb 7,2003

G. Ken Holman               mailto:gkholman@xxxxxxxxxxxxxxxxxxxx
Crane Softwrights Ltd.        http://www.CraneSoftwrights.com/s/
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