@abc.abstractmethod<EOL><INDENT>def get_depot_notification_session(self, depot_receiver):<DEDENT>
return<EOL>
Gets the notification session for notifications pertaining to depot service changes.

        :param depot_receiver: the depot receiver
        :type depot_receiver: ``osid.installation.DepotReceiver``
        :return: a ``DepotNotificationSession``
        :rtype: ``osid.installation.DepotNotificationSession``
        :raise: ``NullArgument`` -- ``depot_receiver`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_depot_notification() is false``

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