replacing values in file1 from file2

Hi

I've been stuck on this - I thought it would be simpler than it is. (I'm 
pretty much only just past beginner level)
I have two xml files. One with pairs of terms in source and target language 
but with an untranslated target language term (say, English and Danish). In 
another xml file I have the Danish translations, one for each pair of terms, 
and sequenced in exactly the same way.
<file1>
 <terms>
   <source lang="english">
     <term>dog</term>
   </source>
   <source lang="danish">
     <term>dog</term>
   </source>
 </terms>
 <terms>
   <source lang="english">
     <term>dog</term>
   </source>
   <source lang="danish">
     <term>dog</term>
   </source>
 </terms>
</file1>

<file2>
 <tranlated>
   <term lang="danish">hund</term>
   <term lang="danish">bord</term>
 </translated>
</file2>

I've tried matching a nodeset in file1 using <..  
match="//source[(_at_)lang='danish']/term"> seems fine. Then I've tried to 
copy-of the value from select="document('file2.xml')//term/text()" in 
various ways. I get the first value only from the list copied, but in all 
the locations I wanted. How do I pass on the number of the node in the first 
nodeset to the nodeset selected from the second file. I tried setting up a 
variable using position() but couldn't get it to work.
Sorry this is so long-winded. I simplified the xml. In reality I'm using tmx 
which is a translation memory format.
thanks
Ronan

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