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>> "Extending" > > a document type can break applications which is more or less what > > happens in binary formats too! > > Type inheritance in XML Schema can provide extensibility > benefits to the > author of the original schema. The gist of the argument is that in OOP, one cannot change the cardinality of a mutator function. In other words, I can't change addFoo() to addFoos(), or put tack an additional addFoo() function onto a base type through extension. In XML Schema you can, in essence, violate the cardinality restrictions of an element of a base type, so long as the new elements are distinct _in position_ from the original (constrained) occurrence. So how would you model such a datatype extension in an OOP language? Not naturally, that's for sure.
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