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> Sure, a relational database might not be the best fit for a given
> hierarchical structure. But for other cases the fit may be as good or
> better than any other database....
I was under the impression the OP was trying to design a relational database
to hold arbitrary XML documents, not to hold a specific document. In other
words, to implement a hierarchical database on top of a relational database.
I don't think that's a good way of implementing a hierarchical database. I
apologize that I don't have time to write a detailed rationale for that
view, but it's based on a lot of experience, including expensive failures of
projects that tried to do exactly that.