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From: "Henry S. Thompson" <email@example.com>
> W3C XML Schema cannot achieve this if the elements involved are
> restricted to appear exactly once. You are only allowed one all group
> which must be the entire content model.
If the document is meant to be for computer consumption, then W3C XML
Schema's limitation here is IMHO a good thing. There is clearly some structure
there that is not being named and modelled: by having Table containing
(attributes, out_of_hierarchy_tables, child_tables)
the structure is made really clear.
(If the document were meant for human consumption or production too,
then the opposite would be true: supporting/using "natural" idioms is good
and prudent. But I don't really see that here.)
Another approach is, of course, to use Schematron to overay extra
constraints. So use WXS for whatever it is convenenient for, and
flip up to Schematron for the other constraints.