{
  "$id": "https://schema.nfh.global/Prognosis/v2.0",
  "x-iri": "https://schema.nfh.global/Prognosis/v2.0",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Prognosis",
  "type": "object",
  "description": "A real-time prediction of a vehicle's arrival or departure time at a stop, including an indication of prediction confidence.",
  "properties": {
    "scheduledTime": {
      "description": "Timetabled scheduled time",
      "type": "string",
      "format": "date-time"
    },
    "estimatedTime": {
      "description": "Predicted actual time",
      "type": "string",
      "format": "date-time"
    },
    "certainty": {
      "description": "Confidence of the prognosis (e.g. real, prognosis, calculated, unknown)",
      "type": "string"
    },
    "delaySeconds": {
      "description": "Delay in seconds relative to the scheduled time",
      "type": "number"
    },
    "id": {
      "description": "Unique identifier for the tracking record",
      "type": "string"
    },
    "url": {
      "description": "URL endpoint for real-time tracking information",
      "type": "string",
      "format": "uri"
    },
    "status": {
      "description": "Current tracking status",
      "$ref": "https://schema.nfh.global/State/v2.0/schema.json"
    },
    "validity": {
      "description": "Validity period for this tracking record",
      "$ref": "https://schema.nfh.global/TimePeriod/v2.1/schema.json"
    }
  },
  "additionalProperties": false,
  "x-tags": [
    "mobility",
    "ride-hailing"
  ]
}