@abc.abstractmethod<EOL><INDENT>def get_item_notification_session(self, item_receiver):<DEDENT>
return<EOL>
Gets the notification session for notifications pertaining to item changes.

        :param item_receiver: the item receiver interface
        :type item_receiver: ``osid.assessment.ItemReceiver``
        :return: an ``ItemNotificationSession``
        :rtype: ``osid.assessment.ItemNotificationSession``
        :raise: ``NullArgument`` -- ``item_receiver`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_item_notification()`` is ``false``

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