@abc.abstractmethod<EOL><INDENT>def register_for_changed_superseding_events(self):<DEDENT>
pass<EOL>
Registers for notification of updated superseding events.

        ``SupersedingEventReceiver.changedSupersedingEvents()`` is
        invoked when a superseding event is changed.

        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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