creating namespaces in a generated script

Hi,
 
as input to my xslt script, I have an xml file, which contains a path P as a
string. The nodes on this path have namespaces.
  From this xml file I want to generate a stylesheet S in which P is
actually used as xpath. The URIs mathing the prefixes could be easily
created but how can I include these namespaces in S if they are not part of
the input?
 
Regards 

Markus Fries 

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