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Treat each (non-xml) data source as one or more virtual XML documents
and write your query accordingly. This is definitely being done today.
Remember, performance is relative -- for example, queries in data
warehouses are usually slower than in transactional databases -- and
slow performance is better than no application at all, which is often
the case with these sorts of applications.
Dare Obasanjo wrote:
> Huh? Exactly how does XQuery allow me to join data between disparate
> sources such as two SQL databases, some XML documents and an RDF store
> [in any sort of performant manner]?