code: public static String getDefaultMapElementNodeName(Class<? extends MapElement> type) {
  		if (MapPolyline.class.isAssignableFrom(type)) {
  			return NODE_POLYLINE;
  		}
  		if (MapPoint.class.isAssignableFrom(type)) {
  			return NODE_POINT;
  		}
  		if (MapPolygon.class.isAssignableFrom(type)) {
  			return NODE_POLYGON;
  		}
  		if (MapCircle.class.isAssignableFrom(type)) {
  			return NODE_CIRCLE;
  		}
  		if (MapMultiPoint.class.isAssignableFrom(type)) {
  			return NODE_MULTIPOINT;
  		}
  		return null;
  	}
docs: Replies the default name of the XML node for the given type of map element.
  
  @param type the type of the map element.
  @return the default XML node name; or {@code null} if the type if unknown.