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

Hi,

   I am trying to make a variable that is either true or false, and
later doing an <xsl:if> operation with the condition being not'd, but
for some reason xalan 2.4.D1 is saying that a not("variable assigned
as false") is not true.

   Is this a bug or am I doing something wrong?

   Test case:

<?xml version="1.0"?>
<xsl:stylesheet
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="1.0">

  <xsl:output method="xml"/>

  <xsl:template match="/">

    <!-- make a false variable entitled 'false-variable' -->
    <xsl:variable name="false-variable">
      <xsl:value-of select="false()"/>
    </xsl:variable>

    <xsl:text>$false-variable == </xsl:text>
    <xsl:value-of select="$false-variable"/>
    <xsl:text>
</xsl:text>

    <xsl:choose>
      <xsl:when test="$false-variable">
	<xsl:text>variable is true.</xsl:text>
      </xsl:when>
      <xsl:when test="not($false-variable)">
	<xsl:text>variable is false.</xsl:text>
      </xsl:when>
      <xsl:otherwise>
	<xsl:text>This should not occur.</xsl:text>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>
</xsl:stylesheet>

outcome:

$ java org.apache.xalan.xslt.Process -in job-listing.xml  -xsl test.xsl 
<?xml version="1.0" encoding="UTF-8"?>
$false-variable == false
variable is true.

?

Elizabeth

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