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"Rick Marshall" wrote
> level 1. is the logical layer - how does the data look? like sets of
> relations. and able to be mathematically manipulated (at least in
> principle) as sets.

This is an interesting paper that proposes a heterogeneous nested relations
model for XML:
http://www.indiana.edu/~isdept/research/papers/tr137-1.pdf



======== Ken North ===========
www.WebServicesSummit.com
www.SQLSummit.com
www.GridSummit.com





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