@abc.abstractmethod<EOL><INDENT>def get_comment_notification_session(self, comment_receiver):<DEDENT>
return<EOL>
Gets the ``OsidSession`` associated with the comment notification service.

        :param comment_receiver: the receiver
        :type comment_receiver: ``osid.commenting.CommentReceiver``
        :return: a ``CommentNotificationSession``
        :rtype: ``osid.commenting.CommentNotificationSession``
        :raise: ``NullArgument`` -- ``comment_receiver`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_comment_notification()`` is ``false``

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