I have a system by which I store complex data in PostgreSQL as an XML
string. I have a simple function that can return a single value.

I would like to return sets and sets of rows from the data. This is not a
huge problem, as I've written a few of these functions. The question I'd
like to put out there, is how would you represent heirarchical data as:


The biggest problem with XML is storing data is easy, getting it back out
in a sane way is less so. How would you guys think to represent this?
(Obviously, this is a bogus example, real life would be much worse!)

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