[xsl] sorting and listing

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Subject: HELP:  sorting and listing
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Hello,
   i am starting to get my first xsl stylesheets to work, but now
there are some problems.
i have the following xml file with list of members with name and city:

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="members.xsl"?>
<members>
     <member>
         <name>Philips</name>
         <city>London</city>
     </member>
     <member>
         <name>Michael</name>
         <city>Paris</city>
     </member>
     <member>
         <name>Smith</name>
         <city>London</city>
     </member>
     <member>
         <name>Hans</name>
         <city>Berlin</city>
     </member>
     <member>
         <name>Peter</name>
         <city>New York</city>
     </member>
     <member>
         <name>Gabriel</name>
         <city>Berlin</city>
     </member>
</members>

the following stylesheet should display the city names
only once and the name of members who live in should be
listed under the city names:

<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
version="1.0">
   <xsl:template match="/">
     <html>
       <xsl:apply-templates/>
     </html>
   </xsl:template>

   <xsl:template match="members">
     <p><ul>
     <xsl:for-each select="member">
       <xsl:sort select="city"/>

           <xsl:if test="city != preceding::city">
         <u><h1><xsl:value-of select="city"/></h1></u>
       </xsl:if>

           <li><xsl:value-of select="name"/></li>

         </xsl:for-each>
     </ul></p>
   </xsl:template>

</xsl:stylesheet>

so i do firstly sort the list by city names and then want to detect the 
chane of city name, if true then display it. i have got the follwing 
output which istnt right:

Berlin
   Hans
Berlin
   Gabriel
   Philips
London
   Smith
New York
   Peter
   Paris
   Michael

correct output would be like:

Berlin
   Hans
   Gabriel
London
   Philips
   Smith
Paris
   Michael
New York
   Peter


ANY HINTS , SOLUTION ??
PLEASE reply to my email addres, because i am facing problems with
the subscribtion of the this list.


thanks
hussnain

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