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> Or what does it mean to say "instances are equal"? The logic is, "if all instances that are valid in A are valid in B, and vice versa, and the same for invalidity, then A and B are equal schemata". The logic breaks down if the "level of invalidity" is variable, which for most XML schema languages, it isn't. For example, you can imagine a schema langauge which advises people not to place an element somewhere, and gives a "50%" no-no level. Then, to say that schemata are the same, you'd have to say that all levels are the same, which you couldn't do if you were constraining with a langauge which doesn't allow levels (you'd have to set it at 100% or 0%). -- Kindest Regards, Sean B. Palmer @prefix : <http://webns.net/roughterms/> . :Sean :hasHomepage <http://purl.org/net/sbp/> .
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