> I have not followed this through in a test, but could one not 
> 
>  - build the separate key tables for each document
>  - use Muenchian techniques to get back a list of them for each
>    document
>  - stash all those lists in a new tree in a variable
>  - convert that tree to a nodeset
>  - fool around in that nodeset, where all the keys are known, to find 
>    out which document a key comes from 
> 
Yes, this is essentially the same as the technique I originally proposed, of
creating a new XML document to act as an index of all the other documents.

Mike


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