Referencing Schemas as Namespaces
Up to this point, I've been somewhat vague about exactly how a schema is associated with a namespace. How does an XML processor know how to access a schema from a namespace declaration and use it for validating a document? It's actually specific to the application that's processing the document, and currently there aren't many applications that support namespaces. One application that does support them, however, is Internet Explorer 5.0.
In Internet Explorer 5.0, schemas are associated with namespaces in a couple of different ways. The first approach is through a URN, which is how the XML-Data and XML Schema Data Type namespaces are associated with their respective schemas (as you saw in the previous section). ...
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