@utilities.arguments_not_none<EOL><INDENT>def set_identifier_namespace(self, namespace):<DEDENT>
raise errors.Unimplemented()<EOL>
Seta the identifier namespace.

        arg:    namespace (string): the namespace
        raise:  InvalidArgument - ``namespace`` is invalid
        raise:  NoAccess - ``namespace`` cannot be modified
        raise:  NullArgument - ``namespace`` is ``null``
        *compliance: mandatory -- This method must be implemented.*