@abc.abstractmethod<EOL><INDENT>def supports_superseding_event_lookup(self):<DEDENT>
return<EOL>
Tests if a superseding event lookup service is supported.

        A superseding event lookup service defines methods to access
        superseding events.

        :return: true if superseding event lookup is supported, false otherwise
        :rtype: ``boolean``

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