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Selecting elements based on values of other ones

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