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   merging multiple XML documents

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  • From: "Kaszubski, William J." <bill.kaszubski@Covance.Com>
  • To: "'xml-dev@xml.org'" <xml-dev@xml.org>
  • Date: Mon, 15 May 2000 14:00:54 -0500

We have a situation where we need to merge several (anywhere from 2 to 100)
XML documents into one document that is the union of all the documents. All
the documents are valid (to the same DTD) and well-formed, and each of the
lowest-level nodes can be uniquely identified by its value and the values of
all of its ancestors. All of the nodes in the subdocuments all are sorted so
that they appear in ascending order according to this unique identifier. We
need to end up with a document that has the same structure as the input
documents, contains all of the unique nodes from all the input documents,
and is also sorted according to the unique identifier.

Obviously , we can parse each one with the DOM, walk through them all
simultaneously looking for the node that should appear next, and then copy
one node at a time to yet another DOM instance, but we fear this might be a
little slow <g>. Any ideas? Could SAX help here? Is this an XSL problem?
Where should we begin?

Bill Kaszubski

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