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XSLT Grouping

I have simple XML with two levels (Header and Line) of tags, for example:

<?xml version="1.0"?>
<Header>
    <line>Line 1</line>
    <line>Line 2</line>
    <line>Line 3</line>
    <line>Line 4</line>
    <line>Line 5</line>
    <line>Line 6</line>
    <line>Line 7</line>
    <line>Line 8</line>
    <line>Line 9</line>
</Header>

I need to group strings on sets of X strings (X = 3, for example) so that my output is as follows:

<?xml version="1.0"?>
<Header>
    <set>
        <line>Line 1</line>
        <line>Line 2</line>
        <line>Line 3</line>
    </set>
    <set>
        <line>Line 4</line>
        <line>Line 5</line>
        <line>Line 6</line>
    </set>
    <set>
        <line>Line 7</line>
        <line>Line 8</line>
        <line>Line 9</line>
    </set>
</Header>

How to write XSLT that can do such a conversion?

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4 answers

The following conversion creates the desired result :

<xsl:stylesheet version="1.0" 
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>

 <xsl:variable name="vN" select="3"/>

  <xsl:template match="/*">
    <xsl:copy>
      <xsl:apply-templates 
           select="line[position() mod $vN = 1]"/>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="line">
    <set>
      <xsl:apply-templates mode="copy" select= 
       ". 
       | 
        following-sibling::line[position() &lt; $vN]"/>
    </set>
  </xsl:template>

    <xsl:template match="line" mode="copy">
      <xsl:copy-of select="."/>
    </xsl:template>
</xsl:stylesheet>

When applied to the provided XML document :

<Header>
    <line>Line 1</line>
    <line>Line 2</line>
    <line>Line 3</line>
    <line>Line 4</line>
    <line>Line 5</line>
    <line>Line 6</line>
    <line>Line 7</line>
    <line>Line 8</line>
    <line>Line 9</line>
</Header>

result :

<Header>
  <set>
    <line>Line 1</line>
    <line>Line 2</line>
    <line>Line 3</line>
  </set>
  <set>
    <line>Line 4</line>
    <line>Line 5</line>
    <line>Line 6</line>
  </set>
  <set>
    <line>Line 7</line>
    <line>Line 8</line>
    <line>Line 9</line>
  </set>
</Header>

Please note the following :

  • Use the XPath operatormod to find out the first element linein each group of elements vN.

  • , line

+4

XSLT, , . , .

, , sibling mod. , .

, .

xslt , .

+1

http://www.xml.com/pub/a/2003/11/05/tr.html XSLT 2.0. :

<xsl:for-each-group select="*" group-ending-with="*[position() mod 3 = 0]">

+1

. :

<?xml version='1.0' encoding='UTF-8'?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="1.0">

  <xsl:template match="/Header">
    <Header>
      <xsl:for-each select="line">
        <xsl:if test="not(number()=0) and position() mod 3 = 0">
          <set>
            <xsl:variable name="pos" select="position()"/>
            <line><xsl:value-of select="../line[position()=($pos -2)]"/></line>
            <line><xsl:value-of select="../line[position()=($pos -1)]"/></line>
            <line><xsl:value-of select="text()"/></line>
            </set>
        </xsl:if>

      </xsl:for-each>
    </Header>
  </xsl:template>

</xsl:stylesheet>

($ pos-1, $ pos-2 thing is not very pretty)

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