Thanks a lot for your fast answers! Unfortunately I have still a problem 
with namespaces....



Now that I have a result document with elements from different 
namespaces: xmlns:srcml="http:/srcml.de" and "http://your.new.ns", how 
do I choose elements by their namespace? (Sorry, if thats a dumb 
question but I cound't find an answer in my literature yet).

So, how do I match all elements from the new namespace, and how do I 
match only the elements from the srcml namespace?



If you know a good tutorial about namespaces which covers my problem, 
please send me a link.



regards,
Garvin



Can someone please tell me how I can give elements of a subtree that are 
copied to the output with <xsl:copy-of select="."> a new namespace?

you can't, changing the namespace is changing the name so you can't copy
replace
 <xsl:copy-of select=".">
by
<xsl:spply-templates mode="newns" select="."/>

together with a mode that changes namespace of every element in the
subtree:


<xsl:template match="*">
 <xsl:element name="{local-name()}" namespace="http://your.new.ns">
  <xsl:copy-of select="@*"/>
  <xsl:spply-templates mode="newns"/>
 </xsl:element>
</xsl:template>

David



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