Hi,
 
 >  There is the xml source code as:
 >  <doc>
 >     <city name="Paris"
 >           country="France" />
 >     <city name="Madrid"
 >           country="Spain" />
 >     <city name="Vienna"
 >           country="Austria" />
 >     <city name="Barcelona"
 >           country="Spain" />
 >     <city name="Salzburg"
 >           country="Austria" />
 >     <city name="Bonn"
 >           country="Germany" />
 >     <city name="Lyon"
 >           country="France" />
 >     <city name="Hannover"
 >           country="Germany" />
 >     <city name="Calais"
 >           country="France" />
 >     <city name="Berlin"
 >           country="Germany" />
 >  </doc>
 > 
 >  I hope to get the result as:
 > 
 >      France:
 >          Paris, Lyon, Calais
 >      Spain:
 >          Madrid, Barcelona
 >      Austria:
 >          Vienna, Salzburg
 >      Germany:
 >          Bonn, Hannover, Berlin
 > 
 >  I do not know how to use the result of set:distinct template to do so.
 
 Create a key that indexes each city based on its country:
 
 <xsl:key name="cities" match="city" use="@country" /> 
 
 That allows you to quickly get at all the cities from a particular
 country using:
 
   key('cities', $country)
 
 Now use the set:distinct template to get the unique @country
 attributes in the document:
 
   <xsl:call-template name="set:distinct"> 
     <xsl:with-param name="nodes" select="/doc/city/@country" /> 
   </xsl:call-template> 
 
 Then create a template that matches the country attributes in
 set:distinct mode. In there, give the value of that country attribute,
 a colon, a new line, and then iterate over the cities that you
 retrieve using the key, as follows:
 
 <xsl:template match="@country" mode="set:distinct"> 
   <xsl:text> &#xA;</xsl:text>
   <xsl:value-of select="." /> 
   <xsl:text> :&#xA;    </xsl:text>
   <xsl:for-each select="key('cities', .)"> 
     <xsl:value-of select="@name" /> 
     <xsl:if test="position() != last()"> , </xsl:if>
   </xsl:for-each> 
 </xsl:template> 
 
 The countries come out in a slightly different order from the one
 you're expecting, but hopefully that isn't a problem.
 
 I hope that helps,
 
 Jeni
 
 ---
 Jeni Tennison
 http://www.jenitennison.com/
 
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