XML Tutorial/XSLT stylesheet/count

count elements which occured in XML source

File: Data.xml
<?xml version="1.0" encoding="utf-8"?>
<data>
    <AAA>
      <BBB id="b1">
        <CCC name="q" size="12"/>
        <EEE id="e1">
          <SSS/>
        </EEE>
        <CCC weight="45"/>
        <CCC/>
      </BBB>
    </AAA>
    <AAA>
      <EEE id="e2"/>
      <CCC>
        <DDD/>
        <DDD/>
      </CCC>
    </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="/">
      <TABLE border="1" width="90%">
        <TR>
          <td>Element</TH>
          <td>Occurs</TH>
        </TR>
        <xsl:for-each select="/descendant::*">
          <xsl:variable name="pos" select="position()"/>
          <xsl:if test="not(/descendant::*[position() &lt; $pos and name()=name(current())])">
            <TR>
              <TD>
                <xsl:value-of select="name()"/>
              </TD>
              <TD>
                <xsl:value-of select="count(/descendant::*[name()=name(current())])"/>
              </TD>
            </TR>
          </xsl:if>
        </xsl:for-each>
        <TR>
          <td>Total count</TH>
          <td>
            <xsl:value-of select="count(//*)"/>
          </TH>
        </TR>
      </TABLE>
    </xsl:template>
</xsl:stylesheet>
Output:
<?xml version="1.0" encoding="UTF-8"?><TABLE border="1" width="90%"><TR><td>Element</TH><td>Occurs</TH></TR><TR><TD>data</TD><TD>1</TD></TR><TR><TD>AAA</TD><TD>2</TD></TR><TR><TD>BBB</TD><TD>1</TD></TR><TR><TD>CCC</TD><TD>4</TD></TR><TR><TD>EEE</TD><TD>2</TD></TR><TR><TD>SSS</TD><TD>1</TD></TR><TR><TD>DDD</TD><TD>2</TD></TR><TR><td>Total count</TH><td>13</TH></TR></TABLE>

Count matches

File: Data.xml 
<?xml version="1.0"?>
<results group="A">
  <match>
    <date>10-Jun-98</date>
    <team score="2">team 1</team>
    <team score="1">team 2</team>
  </match>
  <match>
    <date>10-Jun-98</date>
    <team score="2">team 3</team>
    <team score="2">team 4</team>
  </match>
  <match>
    <date>16-Jun-98</date>
    <team score="1">team 2</team>
    <team score="1">team 4</team>
  </match>
</results>
File: Transform.xslt
<?xml version="1.0"?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="2.0">
  <xsl:variable name="teams" select="distinct-values(//team)" />
  <xsl:variable name="matches" select="//match" />
  <xsl:template match="results">
    <league>
      <xsl:for-each select="$teams">
        <xsl:variable name="this" select="." />
        <xsl:variable name="played"
          select="count($matches[team=$this])" />
        <xsl:variable name="won"
          select="count($matches[team[.=$this]/@score &gt; team[.!=$this]/@score])" />
        <xsl:variable name="lost"
          select="count($matches[team[.=$this]/@score &lt; team[.!=$this]/@score])" />
        <xsl:variable name="drawn"
          select="count($matches[team[.=$this]/@score = team[.!=$this]/@score])" />
        <xsl:variable name="for"
          select="sum($matches/team[.=current()]/@score)" />
        <xsl:variable name="against"
          select="sum($matches[team=current()]/team/@score) - $for" />
        <team name="{.}" played="{$played}" won="{$won}"
          drawn="{$drawn}" lost="{$lost}" for="{$for}" against="{$against}" />
      </xsl:for-each>
    </league>
  </xsl:template>
</xsl:transform>
Output:
<?xml version="1.0" encoding="UTF-8"?><league>
<team name="team 1" played="1" won="1" drawn="0" 
lost="0" for="2" against="1"/><team name="team 2" 
played="2" won="0" drawn="1" lost="1" for="2" against="3"/>
<team name="team 3" played="1" won="0" drawn="1" lost="0" 
for="2" against="2"/><team name="team 4" played="2" won="0" 
drawn="2" lost="0" for="3" against="3"/></league>

Count node

File: Data.xml
<?xml version="1.0"?>
<?xml-stylesheet type="application/xml" href="Transform.xslt"?>
<people>
  <person born="2008" died="2008" id="1">
    <name>
      <first_name>A</first_name>
      <last_name>B</last_name>
    </name>
    <profession>A</profession>
    <profession>B</profession>
    <profession>C</profession>
  </person>
  <person born="2007" died="2007" id="2">
    <name>
      <first_name>D</first_name>
      <middle_initial>E</middle_initial>
      <last_name>F</last_name>
    </name>
    <profession>G</profession>
    <hobby>H</hobby>
  </person>
</people>
File: Transform.xslt
<?xml version="1.0"?> 
<xsl:stylesheet version="1.0" 
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:template match="people">
    <xsl:apply-templates select="person"/>
  </xsl:template>
  <xsl:template match="person">
    Person <xsl:value-of select="position()"/> 
    of <xsl:value-of select="count(//person)"/>:
    <xsl:value-of select="name"/>
  </xsl:template>
</xsl:stylesheet>
Output:
<?xml version="1.0" encoding="UTF-8"?>
    Person 1 
    of 2:
    
      A
      B
    
    Person 2 
    of 2:
    
      D
      E
      F

count()- Takes a node-set argument and returns a value equal to the number of nodes in the node-set

File: Data.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet href="Transform.xslt" type="text/xsl"?>
<europe>
  <state>Belgium</state>
  <state>Germany</state>
  <state>Finland</state>
  <state>Greece</state>
  <state>San Marino</state>
  <state>Switzerland</state>
</europe>

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="europe">
    <xsl:text>&#10;Total Number of States: </xsl:text>
    <xsl:value-of select="count(state)" />
    <xsl:text>&#10;&#10;</xsl:text>
    <xsl:apply-templates select="state">
      <xsl:sort />
    </xsl:apply-templates>
  </xsl:template>
  <xsl:template match="state">
    <xsl:text> - </xsl:text>
    <xsl:apply-templates />
    <xsl:text>&#10;</xsl:text>
  </xsl:template>
</xsl:stylesheet>
Output:
Total Number of States: 6
 - Belgium
 - Finland
 - Germany
 - Greece
 - San Marino
 - Switzerland

The count function returns the number of nodes in the argument node-set.

File: Data.xml
<?xml version="1.0" encoding="utf-8"?>
<data>
    <AAA>
      <CCC/>
      <BBB>
        <CCC>Carl</CCC>
      </BBB>
      <BBB/>
      <BBB/>
    </AAA>
    <AAA>
      <CCC/>
      <BBB/>
      <BBB>
        <CCC>John</CCC>
        <CCC>Charles</CCC>
        <CCC>Robert</CCC>
        <CCC>Anthony</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>
        <B>
          <xsl:text>//AAA : </xsl:text>
        </B>
        <xsl:value-of select="count(//AAA)"/>
      </DIV>
      <DIV>
        <B>
          <xsl:text>//CCC : </xsl:text>
        </B>
        <xsl:value-of select="count(//CCC)"/>
      </DIV>
      <DIV>
        <B>
          <xsl:text>//AAA/CCC : </xsl:text>
        </B>
        <xsl:value-of select="count(//AAA/CCC)"/>
      </DIV>
      <DIV>
        <B>
          <xsl:text>//CCC[text()]) : </xsl:text>
        </B>
        <xsl:value-of select="count(//CCC[text()])"/>
      </DIV>
    </xsl:template>
</xsl:stylesheet>
Output:
<?xml version="1.0" encoding="UTF-8"?><DIV><B>//AAA : </B>2</DIV><DIV><B>//CCC : </B>7</DIV><DIV><B>//AAA/CCC : </B>2</DIV><DIV><B>//CCC[text()]) : </B>5</DIV>

Use count function in math calculation

File: Data.xml
<?xml version="1.0"?>
<numbers>
  <x>4</x>
  <y>3.2</y>
  <z>11</z>
</numbers>

File: Transform.xslt
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="1.0">
  <xsl:output method="xml" omit-xml-declaration="yes" />
  <xsl:template match="numbers">
    11 + count(*) =
    <xsl:value-of select="11+count(*)" />
  </xsl:template>
</xsl:stylesheet>
Output:

    11 + count(*) =
    14