select=count(document(other.xml)/eu/other/state) : select « XSLT stylesheet « XML Tutorial

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File: Data.xml
<?xml version="1.0" encoding="UTF-8"?>
<eu>
 <member>
  <state>Austria</state>
  <state founding="yes">Belgium</state>
 </member>
 <candidate>
  <state>Poland</state>
  <state>Romania</state>
  <state>Slovakia</state>
  <state>Slovenia</state>
  <state>Turkey</state>
 </candidate>
</eu>


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="xml" indent="yes" />

  <xsl:template match="eu">
    <xsl:copy>
      <xsl:comment>
        <xsl:text>Member states: </xsl:text>
        <xsl:value-of select="count(member/state)" />
      </xsl:comment>
      <xsl:copy-of select="member" />
      <xsl:comment>
        <xsl:text>Candidate states: </xsl:text>
        <xsl:value-of select="count(candidate/state)" />
      </xsl:comment>
      <xsl:copy-of select="candidate" />
      <xsl:comment>
        <xsl:text>Other states: </xsl:text>
        <xsl:value-of
          select="count(document('other.xml')/eu/other/state)" />
      </xsl:comment>
      <xsl:copy-of select="document('other.xml')/eu/other" />
    </xsl:copy>
  </xsl:template>

</xsl:stylesheet>

Output:

<?xml version="1.0" encoding="UTF-8"?>
<eu><!--Member states: 2--><member>
      <state>Austria</state>
      <state founding="yes">Belgium</state>
   </member>
   <!--Candidate states: 5--><candidate>
      <state>Poland</state>
      <state>Romania</state>
      <state>Slovakia</state>
      <state>Slovenia</state>
      <state>Turkey</state>
   </candidate>
   <!--Other states: 0--></eu>