W3C XML Schema (WXS) possesses a number of features that mimic object oriented concepts, including type derivation and polymorphism. However real world experience has shown that these features tend to complicate schemas, may have subtle interactions that lead tricky problems, and can often be replaced by other features of WXS. In this article I explore both derivation by restriction and derivation by extension of complex types showing the pros and cons of both techniques, as well
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