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Michael Champion wrote: > As I understand it, it is the job of the RDBMS implementation to > perform whatever mapping from the logical to physical world is needed > to do this efficiently. [1] Perhaps one advantage of XML is that it > just blows off this distinction -- it gets a lot of its practical power > by 'modeling' relationships as *physical* containment of a set of > elements (which of course may be subtrees) inside other elements. I'd suggest a slightly different focus: the physical model is private while the logical model is public. XML is designed to handle the public, logical part so that people can share information without being forced to use the same physical models. Date's speech rants not against XML itself but against XML encroaching on the physical side. Granted, he doesn't like SQL much either, but he might be right about XML, unless object-oriented and XML databases are performing and scaling a lot better than they were the last time I looked. I agree with the advantages Michael lists for XML outside the database. All the best, David
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