The id function selects elements by their unique ID. : id « XSLT stylesheet « XML Tutorial

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XML Tutorial » XSLT stylesheet » id 
5. 55. 5. The id function selects elements by their unique ID.
File: Data.xml
<?xml version="1.0" encoding="utf-8"?>
<data>
  <chapter id="intro">Introduction</chapter>
  <chapter id="body">
    <title id="t1">BODY</title>
    <text value="text1">text text text</text>
  </chapter>
  <chapter id="end">THE END</chapter>
</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="/">
      <paragraph>
        <xsl:value-of select="id('intro')"/>
      </P>
      <paragraph>
        <xsl:value-of select="id('body')/text"/>
      </P>
      <paragraph>
        <xsl:value-of select="id('text1')"/>
      </P>
    </xsl:template>
</xsl:stylesheet>

Output:

<?xml version="1.0" encoding="UTF-8"?><P/><P/><P/>
5. 55. id
5. 55. 1. id() takes a string as its argument and returns a node-set containing any node that has an attribute of type ID equal to the function's argument
5. 55. 2. Compare id
5. 55. 3. select by id()
5. 55. 4. Here is a test of the id()
5. 55. 5. The id function selects elements by their unique ID.
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