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What characters are allowed in an XML namespace prefix?

April 26, 2017allowed characters namespace prefix XML

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What characters are allowed in an XML namespace prefix?

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The prefix can contain any character that is allowed in the Name [5] production in XML 1.0 except a colon. Of note, the xml prefix can only be bound to the http://www.w3.org/XML/1998/namespace namespace name. The xmlns prefix cannot be used except to declare namespaces; for example, xmlns:xmlns = “http://www.w3.org/2000/xmlns/” is not a legal namespace declaration.

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The prefix can contain any character that is allowed in the Name [5] production in XML 1.0 except a colon.