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XML Schemas

This, I think, is one of the most exciting concepts out there: an XML language to define other XML languages. The language is known formally as the W3C Recommendation XML Schemas, and it has, at the time of printing, two parts: structures and data types.

XML Schemas even takes the time to use its own language to define itself. You might think this a circular argument with no basis, but that's not the case. What really happens is a two-part process. The XML Schemas language validates against a DTD for the language. This confirms it as a valid XML language by DTD. Then the XML Schemas validator takes the XML Schemas language for XML Schemas and checks it against itself for validity. It passes.


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