code: function FeedEntity(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 a FeedEntity.
  @memberof transit_realtime
  @interface IFeedEntity
  @property {string} id FeedEntity id
  @property {boolean|null} [isDeleted] FeedEntity isDeleted
  @property {transit_realtime.ITripUpdate|null} [tripUpdate] FeedEntity tripUpdate
  @property {transit_realtime.IVehiclePosition|null} [vehicle] FeedEntity vehicle
  @property {transit_realtime.IAlert|null} [alert] FeedEntity alert
   
  Constructs a new FeedEntity.
  @memberof transit_realtime
  @classdesc Represents a FeedEntity.
  @implements IFeedEntity
  @constructor
  @param {transit_realtime.IFeedEntity=} [properties] Properties to set