code: public Map<String, String> extractTypes(XEvent event) {
  		return XCostType.instance().extractValues(event);
  	}
docs: Retrieves a map containing all cost types for all child attributes
  of an event.
  
  @see #extractAmounts(XEvent)
  
  @param event
  Event to retrieve all cost types for.
  @return Map from all child keys to cost types.