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Use strings as arguments of boolean() function

A string is  true if and only  if its length is non-zero.  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>text</TH>           <td>boolean</TH>         </TR>         <xsl:for-each select="//text">           <TR>             <TD>               <xsl:value-of select="."/>               <xsl:text/>             </TD>             <TD>               <xsl:value-of select="boolean(text())"/>             </TD>           </TR>         </xsl:for-each>       </TABLE>     </xsl:template> </xsl:stylesheet> <?xml version="1.0" encoding="UTF-8"?><TABLE border="1"><TR> <td>text</TH><td>boolean</TH></TR><TR><TD>999</TD><TD>true</TD> </TR><TR><TD>A123</TD><TD>true</TD></TR><TR><TD>-16</TD><TD>true </TD></TR><TR><TD>0</TD><TD>true</TD></TR><TR><TD/><TD>false</TD> </TR><TR><TD>false</TD><TD>true</TD></TR></TABLE>