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Uses node-sets as arguments for boolean() function

File: Data.xml <?xml version="1.0" encoding="utf-8"?> <data>     <text>999</text>     <text>A123</text>     <text>-16</text>     <text>0</text>     <text/>     <text>false</text> </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="/">       <TABLE border="1">         <TR>           <td>node-set</TH>           <td>boolean</TH>         </TR>         <TR>           <TD>             <xsl:text>/</xsl:text>           </TD>           <TD>             <xsl:value-of select="boolean(/)"/>           </TD>         </TR>         <TR>           <TD>             <xsl:text>//text</xsl:text>           </TD>           <TD>             <xsl:value-of select="boolean(//text)"/>           </TD>         </TR>         <TR>           <TD>             <xsl:text>//number</xsl:text>           </TD>           <TD>             <xsl:value-of select="boolean(//number)"/>           </TD>         </TR>         <TR>           <TD>             <xsl:text>//text[23]</xsl:text>           </TD>           <TD>             <xsl:value-of select="boolean(//text[23])"/>           </TD>         </TR>       </TABLE>     </xsl:template> </xsl:stylesheet> Output: <?xml version="1.0" encoding="UTF-8"?><TABLE border="1"><TR><td>node-set</TH><td>boolean</TH></TR><TR><TD>/</TD><TD>true</TD></TR><TR><TD>//text</TD><TD>true</TD></TR><TR><TD>//number</TD><TD>false</TD></TR><TR><TD>//text[23]</TD><TD>false</TD></TR></TABLE>