@Override
	public void delMetroRoomnumber(String roomID)
	{
		if((metroRoomIDSet!=null)
		&&(roomID!=null)
		&&(roomID.length()>0)
		&&(metroRoomIDSet.contains(roomID)))
		{
			metroRoomIDSet.remove(roomID);
			if(!CMath.bset(flags(),Area.FLAG_INSTANCE_CHILD))
				for(final Iterator<Area> a=getParentsReverseIterator();a.hasNext();)
					a.next().delMetroRoomnumber(roomID);
		}
	}