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From: Steve Rosenberry <steve.rosenberry@v...> > Is the validation of primitive datatypes built into validators > and not dependent upon a second XML Schema declaration? Yes. And not just the "primitive" datatypes, but also the "built-in derived types" as well. There is a "Schema for Schemas" in the proposed recommendation. But you should not expect schema processors to use it explicitly: it is the schema that is built-in to a schema processors. A schema processor checks more than just whether some data conforms to regular expression. While datatypes do have such "lexical spaces" they also have "value spaces", where a number is checked as a number. (Because of these value spaces, one cannot really bootstrap an XML Schema implementation very nicely from string-matching-only primitives.) Cheers Rick Jelliffe
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