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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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