code: public StandardModel extractStandardTransition(XEvent event) {
  		String transition = extractTransition(event);
  		if (transition != null) {
  			return StandardModel.decode(transition);
  		} else {
  			return null;
  		}
  	}
docs: Extracts the standard lifecycle transition object from a given event.
  
  @param event
  An event.
  @return The standard lifecycle transition instance of this event. Can be
  <code>null</code>, if not defined.