@abc.abstractmethod<EOL><INDENT>def supports_grade_system_notification(self):<DEDENT>
return<EOL>
Tests if grade system notification is supported.

        Messages may be sent when grade entries are created, modified,
        or deleted.

        :return: ``true`` if grade system notification is supported, ``false`` otherwise
        :rtype: ``boolean``


        *compliance: mandatory -- This method must be implemented.*