Hello, friends of the mighty XSLT!

I wonder if there's someone here who could answer this question:

For any result-tree-fragment f, what is the URI of the document that ownes the 
nodes returned by exslt:nodeSet(f)?

This is particulary interesting to me, because I tried to use the 
generate-id() function (which, if I'm right, determines the equality of nodes 
based on the URI of the document they belong to) on some nodes gained in this 
way and experienced certain irregularities in the results returned. In 
particular, *sometimes* nodes gained by different calls to exslt:nodeSet get 
the same id, *sometimes* they don't, and I can not yet describe the 
circumstances of either behaviour.

Well... TIA
        bSpot

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