@abc.abstractmethod<EOL><INDENT>def register_for_deleted_objective_banks(self):<DEDENT>
pass<EOL>
Registers for notification of deleted objective banks.

        ``ObjectiveBankReceiver.deletedObjectiveBanks()`` is invoked
        when a calenedar is deleted.

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

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