def register_for_changed_items(self):
<EOL>MONGO_LISTENER.receivers[self._ns][self._receiver]['<STR_LIT:u>'] = True<EOL>
Registers for notification of updated assessment items.

        ``ItemReceiver.changedItems()`` is invoked when an assessment
        item is changed.

        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure occurred
        *compliance: mandatory -- This method must be implemented.*