{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/aerodatabox/refs/heads/main/json-schema/aerodatabox-subscription-subject-contract-schema.json",
  "title": "SubscriptionSubjectContract",
  "description": "Describes subscription subject",
  "type": "object",
  "properties": {
    "type": {
      "$ref": "#/components/schemas/SubscriptionSubjectType"
    },
    "id": {
      "type": "string",
      "description": "Subject ID of a subscription. Complements SubjectType.\r\n\r\nE.g. SubjectType = \"FlightNumber\" and SubjectId = \"DL 47\" means that this\r\nsubscription is for all updates of flight with number DL47.",
      "nullable": true
    }
  },
  "required": [
    "type"
  ],
  "additionalProperties": false
}