Re: reccursive sum ?

  I don't see the link between concat id + ".xml" and the <xsl:value-of
  select="document($theFileName)..."/>
  $theFileName is not a node set, no ?

That's right: if you use concat (or a xsl:variable with content) then
$theFileName is only a string and so document() will only load one file, 
but if your attributes had the full file name then you could do
document(ME/@id)
and now the argument to document() _is_ a node set of all the id
attributes of all your ME elements, and in that case document() loads
_all_ of the referenced files in one go.

assuming your processor has a node-set() extension (most do) then 
since you don't want to change your input you just need to go

<xsl:variable name="addxml">
<xsl:for-each select="ME">
  <ME id="{@id}.xml"/>
</xsl:for-each>
</xsl:variable>

then


	select="count(document(saxon:node-set($addxml)/ME/@id)/ME/FOURN/DEVOIR"/>

is the number you are after, if you are not using saxon replace
saxon:node-set by your system's node set extension function.

david

-- 
http://www.dcarlisle.demon.co.uk/matthew

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