{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/sound-transit/main/json-schema/sound-transit-arrival-schema.json",
  "title": "Sound Transit Arrival And Departure",
  "description": "Schema for a real-time arrival or departure prediction from the Sound Transit OneBusAway API",
  "type": "object",
  "properties": {
    "routeId": {
      "type": "string",
      "description": "Route identifier"
    },
    "tripId": {
      "type": "string",
      "description": "Trip identifier"
    },
    "serviceDate": {
      "type": "integer",
      "format": "int64",
      "description": "Service date in milliseconds since Unix epoch"
    },
    "vehicleId": {
      "type": "string",
      "description": "Vehicle identifier if known"
    },
    "stopId": {
      "type": "string",
      "description": "Stop identifier"
    },
    "stopSequence": {
      "type": "integer",
      "description": "Sequence number of this stop within the trip"
    },
    "scheduledArrivalTime": {
      "type": "integer",
      "format": "int64",
      "description": "Scheduled arrival time in milliseconds since Unix epoch"
    },
    "scheduledDepartureTime": {
      "type": "integer",
      "format": "int64",
      "description": "Scheduled departure time in milliseconds since Unix epoch"
    },
    "predictedArrivalTime": {
      "type": "integer",
      "format": "int64",
      "description": "Real-time predicted arrival time in milliseconds (0 if no prediction)"
    },
    "predictedDepartureTime": {
      "type": "integer",
      "format": "int64",
      "description": "Real-time predicted departure time in milliseconds (0 if no prediction)"
    },
    "predicted": {
      "type": "boolean",
      "description": "Whether real-time prediction data is available for this arrival"
    },
    "status": {
      "type": "string",
      "description": "Status of the arrival (ON_TIME, EARLY, DELAYED, etc.)"
    },
    "routeShortName": {
      "type": "string",
      "description": "Short name/number of the route"
    },
    "tripHeadsign": {
      "type": "string",
      "description": "Destination headsign displayed on the vehicle"
    }
  },
  "required": ["routeId", "tripId", "stopId", "scheduledArrivalTime"]
}