@abc.abstractmethod<EOL><INDENT>def supports_visible_federation(self):<DEDENT>
return<EOL>
Tests if any map federation is exposed.

        Federation is exposed when a specific map may be identified,
        selected and used to create a lookup or admin session.
        Federation is not exposed when a set of maps appears as a single
        map.

        :return: ``true`` if visible federation is supported, ``false`` otherwise
        :rtype: ``boolean``


        *compliance: mandatory -- This method must be implemented.*