{
        ENotificationImpl notification =
          new ENotificationImpl
           (this,
            Notification.SET,
            newContainerFeatureID, 
            oldContainerFeatureID == newContainerFeatureID ? oldContainer : null,
            newContainer);
        if (msgs == null)
        {
          msgs = notification;
        }
        else
        {
          msgs.add(notification);
        }
      }