RE: RNG vs. XSD : is the use of abstract types andpolymorphis
James Clark asserts that it is not the role of a schema language to model "conceptual" relationships such as inheritance. Such relationships are best modeled elsewhere. Let us suppose that James is correct. Question: Is it best practice to avoid the inheritance machinery provided in XML Schema -- derive-by-extension, derive-by-restriction, and element substitution? What are the practical benefits of doing so? /Roger
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