{
  "type": "object",
  "required": ["ocid", "id", "date"],
  "properties": {
    "ocid": {"type": "string", "description": "Open Contracting ID."},
    "id": {"type": "string"},
    "date": {"type": "string", "format": "date-time"},
    "tender": {"$ref": "#/definitions/Tender"}
  },
  "definitions": {
    "Tender": {
      "type": "object",
      "required": ["id"],
      "properties": {
        "id": {"type": ["string", "integer"]},
        "title": {"type": ["string", "null"]}
      }
    }
  }
}