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of patterns can be expressed whereas it is practically not possible to specify at all in RELAX NG ( or ).

Disadvantages

W3C XML Schema is complex and hard to learn, although that is partially because it tries to do more than mere validation (see PSVI).

Although being written in XML is an advantage, it is also a disadvantage in some ways. The W3C XML Schema language, in particular, can be quite verbose, while a DTD can be terse and relatively

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