Should XSchema provide internal and external subsets, as do XML DTD's?
Note: Please keep in mind that answering no at this stage does not imply that
internal subsets will be banished for all time. It simply means that XSchema
1.0 would not support internal subsets. (We could banish external subsets,
but I doubt that makes sense to anyone.)
Simon St.Laurent
Dynamic HTML: A Primer / XML: A Primer / Cookies