@abc.abstractmethod<EOL><INDENT>def register_for_new_values(self):<DEDENT>
pass<EOL>
Assigns a callback for notifications of new values.

        ``ValueReceiver.newValues()`` is invoked when a new ``Value`` is
        added to this configuration.

        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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