grouping

Hi all,

can you please tell me if it's possible to group by 2 elements?

A simplified example:

<page>
  <ROWSET>
   <ROW>
     <country>Canada</country> 
     <language>french</language> 
   </ROW>
   <ROW>
     <country>Canada</country> 
     <language>english</language> 
   </ROW>
   <ROW>
     <country>Switzerland</country> 
     <language>german</language> 
   </ROW>
   <ROW>
     <country>Switzerland</country> 
     <language>french</language> 
   </ROW>
  </ROWSET>
</page>

When I try something like
<xsl:for-each select="ROW[country=$country]
[not(language=preceding-sibling::ROW/language)]/language">
the result is english, french and german when specifying Switzerland
as country. 

And when I try 
<xsl:for-each select="ROW
[not(../ROW[country=$country]/language=preceding-sibling::ROW[country=$country]/language)]/language">

the result is german.

My favourite result were german and french when specifying Switzerland.

Should I do a reorder first? 
Something like
<country>
  <language>...</language>
</country>

Or is there a solution so that reordering is not necessary?

Thank you very much,
Günter

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