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Are any XML namespace names reserved?

April 26, 2017names namespace XML

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Are any XML namespace names reserved?

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Yes. The namespace name http://www.w3.org/XML/1998/namespace is, by definition, bound to the xml prefix. It cannot be undeclared or bound to any other prefix, nor can the xml prefix be bound to any other namespace name. Note that it is not necessary to declare this namespace, although it is legal to do so. The namespace name http://www.w3.org/2000/xmlns/ is, by definition, bound to the xmlns prefix. It cannot be declared or undeclared, nor can the xmlns prefix be bound to any other namespace name.