@abc.abstractmethod<EOL><INDENT>def register_for_changed_commitment(self, commitment_id):<DEDENT>
pass<EOL>
Registers for notification of an updated commitment.

        ``CommitmentReceiver.changedCommitments()`` is invoked when the
        specified commitment is changed.

        :param commitment_id: the ``Id`` of the ``Commitment`` to monitor
        :type commitment_id: ``osid.id.Id``
        :raise: ``NullArgument`` -- ``commitment_id is null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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