@type t() :: %MBTA.Model.PredictionResourceRelationships{
  alerts: MBTA.Model.PredictionResourceRelationshipsAlerts.t() | nil,
  route: MBTA.Model.ScheduleResourceRelationshipsRoute.t() | nil,
  schedule: MBTA.Model.PredictionResourceRelationshipsSchedule.t() | nil,
  stop: MBTA.Model.ScheduleResourceRelationshipsStop.t() | nil,
  trip: MBTA.Model.ScheduleResourceRelationshipsTrip.t() | nil,
  vehicle: MBTA.Model.PredictionResourceRelationshipsVehicle.t() | nil
}