{
  "description": "Common JSON-schema definitions.",
  "type": "object",
  "definitions": {
    "created_at": {
      "description": "Creation date-time.",
      "example": "2018-01-01T01:01:01.001Z",
      "format": "date-time",
      "readOnly": true,
      "type": "string"
    },
    "updated_at": {
      "description": "Last updated date-time.",
      "example": "2018-01-01T01:01:01.001Z",
      "format": "date-time",
      "readOnly": false,
      "type": "string"
    }
  }
}