Re: [xsl] build group of elements

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2012-06-24 15:41 +0100, henry human wrote:
> sorry for my mistake..again the input xml data and the expecting output:
> The xml data has many foo elements (1000).

Just by conjecture, I'm guessing you want <fooGroup> to be three 
groups of three.  You don't explain the criteria, but that is the 
only "meaningful" interpretation I can see.  Next time it would help 
if you could explain your requirements when including an example 
rather than make us guess by looking at your example.

If I've guessed correctly, this is done easiest with adjacent grouping.

I hope this helps.

. . . . . . . . . Ken

~/t/ftemp $ cat henry.xml
<?xml version="1.0" encoding="UTF-8"?>
 <xmldata>
 <ss> s </ss>
 <nn>n </nn>
  <foo>tt</foo>
   <foo>bb</foo>
   <foo>aa</foo>
    <foo>mm</foo>
       <foo>ll</foo>
       <foo>nn</foo>
        <foo>ff</foo>
         <foo>gg</foo>
      <foo>ii</foo>
  <hh>h</hh>
 </xmldata>
~/t/ftemp $ xslt2 henry.xml henry.xsl
<?xml version="1.0" encoding="UTF-8"?>
<fooGroup>
   <_1st_element>
      <_1st_element>tt</_1st_element>
      <_2nd_element>bb</_2nd_element>
      <_3rd_element>aa</_3rd_element>
   </_1st_element>
   <_2nd_element>
      <_1st_element>mm</_1st_element>
      <_2nd_element>ll</_2nd_element>
      <_3rd_element>nn</_3rd_element>
   </_2nd_element>
   <_3rd_element>
      <_1st_element>ff</_1st_element>
      <_2nd_element>gg</_2nd_element>
      <_3rd_element>ii</_3rd_element>
   </_3rd_element>
</fooGroup>~/t/ftemp $
~/t/ftemp $ cat henry.xsl
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
  xmlns:h="urn:X-henry" exclude-result-prefixes="h"
  version="2.0">

<xsl:output indent="yes"/>

<xsl:template match="xmldata">
  <xsl:for-each-group select="foo"
                      group-adjacent="(position()-1) idiv 9">
    <fooGroup>
      <xsl:for-each-group select="current-group()"
                          group-adjacent="(position()-1) idiv 3">
        <xsl:element name="_{h:ord(position())}_element">
          <xsl:for-each select="current-group()">
            <xsl:element name="_{h:ord(position())}_element">
              <xsl:copy-of select="node()"/>
            </xsl:element>
          </xsl:for-each>
        </xsl:element>
      </xsl:for-each-group>
    </fooGroup>
  </xsl:for-each-group>
</xsl:template>

<xsl:function name="h:ord">
  <xsl:param name="pos"/>
  <xsl:number value="$pos" ordinal="1"/>
</xsl:function>

</xsl:stylesheet>
~/t/ftemp $


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