Re: not()'ing a false variable, xalan 2.4.D1

The reason I am trying to do this is because I have created a template
that tests for a certain condition and returns true or false, for
example:

T:\ftemp>type elizabeth.xml
<?xml version="1.0" encoding="iso-8859-1"?>
<doc>
  <test>
    <name>First</name>
    <x/>
  </test>
  <test>
    <name>Second</name>
    <y/>
  </test>
  <test>
    <name>Third</name>
  </test>
</doc>
T:\ftemp>type elizabeth.xsl
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="1.0">

<xsl:template name="boolean-function-template">
  <xsl:param name="node-set"/>
  <xsl:choose>
    <xsl:when test="$node-set/x"/>
    <xsl:when test="$node-set/y">HELLO!</xsl:when> <!--or any string-->
  </xsl:choose>
</xsl:template>

<xsl:template match="/">
  <xsl:for-each select="doc/test">
    <xsl:variable name="variable">
      <xsl:call-template name="boolean-function-template">
        <xsl:with-param name="node-set" select="."/>
      </xsl:call-template>
    </xsl:variable>
    <xsl:value-of select="name"/>: <xsl:text/>
    <xsl:if test="string($variable)">
      <xsl:text>True!!</xsl:text>
    </xsl:if>
    <xsl:text>
</xsl:text>
  </xsl:for-each>
</xsl:template>

T:\ftemp>xt elizabeth.xml elizabeth.xsl
First:
Second: True!!
Third:

--
Upcoming hands-on in-depth XSLT/XPath and/or XSL-FO:
-                             North America:  Feb 3 - Feb 7,2003

G. Ken Holman               mailto:gkholman@xxxxxxxxxxxxxxxxxxxx
Crane Softwrights Ltd.        http://www.CraneSoftwrights.com/s/
Box 266, Kars, Ontario CANADA K0A-2E0  +1(613)489-0999 (F:-0995)
ISBN 0-13-065196-6                     Definitive XSLT and XPath
ISBN 0-13-140374-5                             Definitive XSL-FO
ISBN 1-894049-08-X Practical Transformation Using XSLT and XPath
ISBN 1-894049-10-1             Practical Formatting Using XSL-FO
Next conference training:                    2002-12-08,03-03,06