XML Tutorial/XSLT stylesheet/call template

Call defined template

File: Data.xml
<?xml version="1.0" encoding="US-ASCII"?>
<state name="BC">
 <county>Bristol<population>1</population></county>
 
 <county>Kent</county>
 <county>Newport</county>
 <county>Providence</county>
 <county>Washington</county>
</state>

File: Transform.xslt
<?xml version="1.0" encoding="US-ASCII"?>
<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="text" />
  <xsl:template match="state">
    <xsl:call-template name="nl" />
    <xsl:text>Counties of </xsl:text>
    <xsl:value-of select="@name" />
    <xsl:call-template name="nl" />
    <xsl:text>Description: </xsl:text>
    <xsl:value-of select="description" />
    <xsl:call-template name="nl" />
    <xsl:text>Source: </xsl:text>
    <xsl:value-of select="from" />
    <xsl:call-template name="nl" />
    <xsl:text>URL: </xsl:text>
    <xsl:value-of select="url" />
    <xsl:call-template name="nl" />
    <xsl:apply-templates select="county" />
    <xsl:text>Estimated state population: </xsl:text>
    <xsl:value-of select="sum(county/population)" />
    <xsl:call-template name="nl" />
  </xsl:template>
  <xsl:template match="county">
    <xsl:text> - </xsl:text>
    <xsl:value-of select="@name" />
    <xsl:text>: </xsl:text>
    <xsl:value-of select="population" />
    <xsl:apply-templates select="population" />
  </xsl:template>
  <xsl:template match="population" name="nl">
    <xsl:text>&#10;</xsl:text>
  </xsl:template>
</xsl:stylesheet>
Output:

Counties of BC
Description: 
Source: 
URL: 
 - : 1
 - :  - :  - :  - : Estimated state population: 1

Return value from template

File: Data.xml
<?xml version="1.0"?>
<list xml:lang="en">
  <title>title 1</title>
  <listitem>item 1</listitem>
  <listitem>item 2</listitem>
  <listitem>item 3</listitem>
  <listitem xml:lang="sw">item 4</listitem>
  <listitem xml:lang="en-gb">item 5</listitem>
  <listitem xml:lang="zu">item 6</listitem>
  <listitem xml:lang="jz">item 7</listitem>
</list>
File: Transform.xslt
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="text"/>
  <xsl:template match="/">
    <xsl:text>Here is a list:&#xA;</xsl:text>
    <xsl:variable name="listitems" select="list/listitem"/>
    <xsl:call-template name="processListitems">
      <xsl:with-param name="items" select="$listitems"/>
    </xsl:call-template>
  </xsl:template>
  <xsl:template name="processListitems">
    <xsl:param name="items"/>
    <xsl:for-each select="$items">
      <xsl:value-of select="position()"/>
      <xsl:text>.  </xsl:text>
      <xsl:value-of select="."/>
      <xsl:text>&#xA;</xsl:text>
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>
Output:
Here is a list:
1.  item 1
2.  item 2
3.  item 3
4.  item 4
5.  item 5
6.  item 6
7.  item 7

use parameter with template

File: Data.xml
<?xml version="1.0" encoding="UTF-8"?>
<province name="BigCity">
 <city>city 1</city>
 <city>city 2</city>
 <city>city 3</city>
 <city>city 4</city>
 <city>city 5</city>
 <city>city 6</city>
 <city>city 7</city>
 <city>city 8</city>
 <city>city 9</city>
 <city>city 10</city>
 <city>city 11</city>
</province>

File: Transform.xslt
<?xml version="1.0" encoding="US-ASCII"?>
<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="text" />
  <xsl:template match="province">
    <xsl:text>BigCity Cities</xsl:text>
    <xsl:call-template name="nl">
      <xsl:with-param name="nl" select=""&#10;&#10;"" />
    </xsl:call-template>
    <xsl:apply-templates select="city" />
  </xsl:template>
  <xsl:template match="city">
    <xsl:text> -> </xsl:text>
    <xsl:value-of select="." />
    <xsl:call-template name="nl">
      <xsl:with-param name="nl" select=""&#10;"" />
    </xsl:call-template>
  </xsl:template>
  <xsl:template match="city[.="city 4"]">
    <xsl:text> -> </xsl:text>
    <xsl:value-of select="." />
    <xsl:call-template name="nl">
      <xsl:with-param name="nl"
        select="" (second largest city in the Yukon)&#10;"" />
    </xsl:call-template>
  </xsl:template>
  <xsl:template match="city[.="city 11"]">
    <xsl:text> -> </xsl:text>
    <xsl:value-of select="." />
    <xsl:call-template name="nl">
      <xsl:with-param name="nl"
        select="" (largest city in the Yukon)&#10;"" />
    </xsl:call-template>
  </xsl:template>
  <xsl:template name="nl">
    <xsl:param name="nl" />
    <xsl:value-of select="$nl" />
  </xsl:template>
</xsl:stylesheet>
Output:
BigCity Cities
 -> city 1
 -> city 2
 -> city 3
 -> city 4 (second largest city in the Yukon)
 -> city 5
 -> city 6
 -> city 7
 -> city 8
 -> city 9
 -> city 10
 -> city 11 (largest city in the Yukon)