last() returns a number equal to the context size from the expression evaluation context : last « XSLT stylesheet « XML Tutorial

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2. XSLT stylesheet
3. last

File: Data.xml
<?xml version="1.0" encoding="utf-8"?>
<data>
    <AAA>
      <BBB>
        <CCC>A</CCC>
      </BBB>
      <BBB/>
      <BBB/>
    </AAA>
    <AAA>
      <BBB/>
      <BBB>
        <CCC>B</CCC>
        <CCC>C</CCC>
        <CCC>D</CCC>
        <CCC>E</CCC>
      </BBB>
    </AAA>
</data>
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:template match="/">
      <DIV>
        <xsl:for-each select="//BBB">
          <xsl:call-template name="printout"/>
        </xsl:for-each>
      </DIV>
      <DIV>
        <xsl:apply-templates select="//CCC"/>
      </DIV>
      <DIV>
        <xsl:apply-templates select="//AAA[last()]//CCC"/>
      </DIV>
    </xsl:template>
    <xsl:template match="CCC">
      <xsl:call-template name="printout"/>
    </xsl:template>
    <xsl:template name="printout">
      <xsl:if test="position()=1">
        <xsl:value-of select="name()"/>
      </xsl:if>
      <xsl:text>(</xsl:text>
      <xsl:value-of select="position()"/>
      <xsl:text>/</xsl:text>
      <xsl:value-of select="last()"/>
      <xsl:text>)</xsl:text>
    </xsl:template>
</xsl:stylesheet>

Output:

<?xml version="1.0" encoding="UTF-8"?><DIV>BBB(1/5)(2/5)(3/5)(4/5)(5/5)</DIV><DIV>CCC(1/5)(2/5)(3/5)(4/5)(5/5)</DIV><DIV>CCC(1/4)(2/4)(3/4)(4/4)</DIV>