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By using an attribute from a particular namespace which has a "global" declaration (for example in XML Schema), you can ensure that any reference to that attribute name will require values of the same data type. This is a convenience to some applications, and a convenience in defining XML structures, though not a necessity. The name may not validly be used for an incompatible attribute. DTDs do not have a comparable facility -- they can provide, via entities, reusable attributes, but not require that all uses be compatible. Jeff
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