code: @Pure
  	public static Iterator<BusItineraryHalt> getBusHalts(BusLine busLine) {
  		assert busLine != null;
  		return new LineHaltIterator(busLine);
  	}
docs: Replies all the bus itinerary halts in the given bus line.
  
  @param busLine the bus line.
  @return the iterator on bus itinerary halts.