@abc.abstractmethod<EOL><INDENT>def get_objective_bank_notification_session(self, objective_bank_receiver):<DEDENT>
return<EOL>
Gets the notification session for notifications pertaining to objective bank service changes.

        :param objective_bank_receiver: the objective bank receiver
        :type objective_bank_receiver: ``osid.learning.ObjectiveBankReceiver``
        :return: an ``ObjectiveBankNotificationSession``
        :rtype: ``osid.learning.ObjectiveBankNotificationSession``
        :raise: ``NullArgument`` -- ``objective_bank_receiver`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_objective_bank_notification() is false``

        *compliance: optional -- This method must be implemented if
        ``supports_objective_bank_notification()`` is true.*