Combining XML data

["Tapan Parikh" <tap@xxxxxxxxxxxx>]

Does anyone know how XML data can be combined?  i.e., I have XML document 1
and document 2, possibly dynamically generated, both in the same format, and
I want to combine the data to create a result document, also in the same
format, which contains the logical union or intersection of the data in the
original document.  Will this require a special handwritten parser?  --Tap


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