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Lang() returns true or false depending on whether the language of the context node as specified by xml

File: Data.xml <?xml version="1.0" encoding="utf-8"?> <P xml:lang="de">   <text xml:lang="cs">a</text>   <text xml:lang="en">and</text>   <text>und</text> </P> 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="text">       <paragraph>         <xsl:choose>           <xsl:when test='lang("cs")'>             <xsl:text>Czech: </xsl:text>           </xsl:when>           <xsl:when test='lang("en")'>             <xsl:text>English: </xsl:text>           </xsl:when>           <xsl:when test='lang("de")'>             <xsl:text>German: </xsl:text>           </xsl:when>         </xsl:choose>         <xsl:value-of select="."/>       </P>     </xsl:template> </xsl:stylesheet> Output: <?xml version="1.0" encoding="UTF-8"?>   <paragraph>Czech: a</P>   <paragraph>English: and</P>   <paragraph>German: und</P>