{
            ENotificationImpl notification =
              new ENotificationImpl
                (owner, 
                 Notification.SET, 
                 EcorePackage.ECLASS__ESUPER_TYPES, 
                 unwrap(oldEGenericType), 
                 unwrap(newEGenericType), 
                 indexOf(oldEGenericType), 
                 false);
            if (notifications == null)
            {
              notifications = notification;
            }
            else
            {
              notifications.add(notification);
            }
            return notifications;
          }