@abc.abstractmethod<EOL><INDENT>def get_grade_entry_notification_session(self, grade_entry_receiver, proxy):<DEDENT>
return<EOL>
Gets the notification session for notifications pertaining to grade entry changes.

        :param grade_entry_receiver: the grade entry receiver
        :type grade_entry_receiver: ``osid.grading.GradeEntryReceiver``
        :param proxy: a proxy
        :type proxy: ``osid.proxy.Proxy``
        :return: a ``GradeEntryNotificationSession``
        :rtype: ``osid.grading.GradeEntryNotificationSession``
        :raise: ``NullArgument`` -- ``grade_entry_receiver`` or ``proxy`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_grade_entry_notification()`` is ``false``

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