code: function (renderable) {
                  if (!(renderable instanceof WorldWind.Placemark)) {
                      throw new ArgumentError(
                          Logger.logMessage(Logger.LEVEL_SEVERE, "WktExporter", "exportPlacemark",
                              "invalidTypeOfRenderable"));
                  }
  
                  var sb = WktType.SupportedGeometries.POINT + '(';
                  sb = sb + renderable.position.longitude + ' ' + renderable.position.latitude;
                  sb = sb + ')';
                  return sb;
              }
docs: Exports a [Placemark]{@link Placemark} in WKT format of type Point.
  @param {Placemark} renderable The Placemark object.
  @throws {ArgumentError} If the specified argument is null or undefined.
  @returns {String} WKT format.