Cart
[Home] [By Thread] [By Date] [Recent Entries]
> It would be nice if there was a way to explicitly flag places where > extensibility may occur: "hey, instance documents may extend <Book> at > this point, so be sure to write your code taking this possibility into > account The XML Schema spec deliberately takes the opposite approach. If a complex type should not be extended it should be flagged with final="extension" (or final="#all" if restrictions are forbidden too). Otherwise you must presume that the type definition can be expanded. But remember that every time it is expanded it must be given a new name, so there is not chance of a conflict between a reference to the original name and a reference to the expanded name. (I don't see where substitution groups make this any differrent, as they have to refer to a specific model/element, and these models do not have direct inheritence properties.) Martin Bryan The SGML Centre
|
