code: function EntitySelector(properties) {
              if (properties)
                  for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
                      if (properties[keys[i]] != null)
                          this[keys[i]] = properties[keys[i]];
          }
docs: Properties of an EntitySelector.
  @memberof transit_realtime
  @interface IEntitySelector
  @property {string|null} [agencyId] EntitySelector agencyId
  @property {string|null} [routeId] EntitySelector routeId
  @property {number|null} [routeType] EntitySelector routeType
  @property {transit_realtime.ITripDescriptor|null} [trip] EntitySelector trip
  @property {string|null} [stopId] EntitySelector stopId
   
  Constructs a new EntitySelector.
  @memberof transit_realtime
  @classdesc Represents an EntitySelector.
  @implements IEntitySelector
  @constructor
  @param {transit_realtime.IEntitySelector=} [properties] Properties to set