Do XML namespaces apply to entity names, notation names, or processing instruction targets?

XML Interview Questions and Answers

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60. Do XML namespaces apply to entity names, notation names, or processing instruction targets?

No.
XML namespaces apply only to element type and attribute names. Furthermore, in an XML document that conforms to the XML namespaces recommendation, entity names, notation names, and processing instruction targets must not contain colons.

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