Selecting elements based on values of other ones. : select « XSLT stylesheet « XML Tutorial

1. XML Tutorial
2. XSLT stylesheet
3. select

File: Data.xml
<?xml version="1.0" encoding="utf-8"?>
<DOCUMENT>
  <TAG1>Hello</TAG1>
  <TAG2>Hello</TAG2>
  <TAG3>World</TAG3>
  <TAG4>Europe<TAG5>World</TAG5>
  </TAG4>
</DOCUMENT>
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="html"/>
    <xsl:template match="/">
      <xsl:if test="//DOCUMENT[TAG1 = TAG2]">
        <xsl:value-of select="//DOCUMENT/TAG1"/>
      </xsl:if>
      <BR/>
      <xsl:if test="//DOCUMENT[TAG3 = TAG4/TAG5]">
        <xsl:value-of select="//TAG4/text()"/>
      </xsl:if>
    </xsl:template>
</xsl:stylesheet>

Output:

Hello<BR>Europe