@abc.abstractmethod<EOL><INDENT>def get_superseding_events_by_genus_type(self, superseding_event_genus_type):<DEDENT>
return<EOL>
Gets a ``SupersedingEventList`` corresponding to the given superseding event genus ``Type`` which does not
        include superseding events of genus types derived from the specified ``Type``.

        :param superseding_event_genus_type: a superseding event genus type
        :type superseding_event_genus_type: ``osid.type.Type``
        :return: the returned ``SupersedingEvent`` list
        :rtype: ``osid.calendaring.SupersedingEventList``
        :raise: ``NullArgument`` -- ``superseding_event_genus_type`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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