if test="not(position()=last())" : last « XSLT stylesheet « XML Tutorial

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File: Data.xml
<?xml version="1.0" encoding="utf-8"?>
<cars>
  <manufacturer name="Chevrolet">
    <car>Cavalier</car>
    <car>Corvette</car>
    <car>Impala</car>
    <car>Malibu</car>
  </manufacturer>
  <manufacturer name="Ford">
    <car>Pinto</car>
    <car>Mustang</car>
    <car>Taurus</car>
  </manufacturer>
  <manufacturer name="Volkswagen">
    <car>Beetle</car>
    <car>Jetta</car>
    <car>Passat</car>
    <car>Touraeg</car>
  </manufacturer>
</cars>


File: Transform.xslt

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

  <xsl:output method="text"/>

  <xsl:template match="/">
    <xsl:for-each select="cars/manufacturer/@name">
      <xsl:value-of select="."/>
      <xsl:if test="not(position()=last())">
        <xsl:text>, </xsl:text>
      </xsl:if>
    </xsl:for-each>
  </xsl:template>

</xsl:stylesheet>

Output:

Chevrolet, Ford, Volkswagen