@abc.abstractmethod<EOL><INDENT>def get_recurring_event_notification_session(self, recurring_event_receiver, proxy):<DEDENT>
return<EOL>
Gets the notification session for notifications pertaining to recurring event changes.

        :param recurring_event_receiver: the recurring event receiver
        :type recurring_event_receiver: ``osid.calendaring.RecurringEventReceiver``
        :param proxy: a proxy
        :type proxy: ``osid.proxy.Proxy``
        :return: a ``RecurringEventNotificationSession``
        :rtype: ``osid.calendaring.RecurringEventNotificationSession``
        :raise: ``NullArgument`` -- ``recurring_event_receiver`` or ``proxy`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_recurring_event_notification()`` is ``false``

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