<xsl:sort> not working under Unix

Hello,

I need some help with some XSL sorting code.
Im trying to reverse sort a list of nodes, before processing them using the
Xalan Java 1 XSLT processor.

The code i have used is detailed below and works when i try it in DOS, but
when its sent to a Unix server, it doesn't work. No errors are produced, but
the order is not reversed. Both processor versions are identical, and the
only thing that is different is the platform.

Ide really appreciate knowing why this is so? Thanks in anticipation.

The XSL and XML fragmemts are listed here...

XSL FRAG:

<!-- OUTPUT 'CHECK FOR MORE ON' KEYWORDS -->
<xsl:text>CHECK FOR MORE ON:
</xsl:text>
<xsl:for-each select="/story/nitf/head/docdata/key-list/keyword">

   <xsl:sort select="position()" data-type="number" order="descending">

   <xsl:variable name="alert_name" select="@key"/>
   <xsl:value-of select="@key"/>
   <xsl:text>http://www.someurl.com/</xsl:text>
   <xsl:choose>
      <xsl:when test="string-length(//category)=0">
         <xsl:text>news</xsl:text>
      </xsl:when>
      <xsl:otherwise>
         <xsl:value-of select="/story/properties/category"/>
      </xsl:otherwise>
   </xsl:choose>
   <xsl:text>/index.html?keywords=</xsl:text>
   <xsl:value-of select="translate($alert_name, ' ', '+')"/>
   <xsl:text>

</xsl:text>
</xsl:for-each>


XML frag
...
...
    <key-list>
       <keyword key="Newsflash update"/>
       <keyword key="UK"/>
       <keyword key="Crime"/>
       <keyword key="Attacks"/>
       <keyword key="Race issues"/>
    </key-list>
...
....

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list