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xmlns-attribute

- XML Element [ scope ]
- XML Namespace [ declared ]

optional part of:

- XML Element [ whole ]

XML reserved attribute

- xml:link attribute
- xml:space attribute
- Namespace (xmlns) attribute
- xml:lang attribute
- xml:attribute attribute
- xml:id attribute

Types:

is a XML reserved attribute

Comment:: namespaces have to be unique globally -- identified by any URI (URN or URL) -- no need that there exists a document there
Comment:: all child elements 'inherit' this namespace declaration

References:

xmlns:namespace-prefix="namespace"