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> The type is a union of a restricted type and that type's base type, isn't
> that always just equivalent to the base type?
Sure. It's like saying "xsd:string" except that it gives special
significance to particular values. You can enumerate them in the schema,
define semantics in a spec more easily, etc.
It's just a neat hack. For standards, in particular, that want to define
some base functionality and still allow an extensibility point, this makes
-- Rich Salz Chief Security Architect
DataPower Technology http://www.datapower.com
XS40 XML Security Gateway http://www.datapower.com/products/xs40.html
XML Security Overview http://www.datapower.com/xmldev/xmlsecurity.html