{
  "title": "Example Schema",
  "type": "object",
  "required": ["firstName", "lastName"],
  "properties": {
      "firstName": { "type": "string" },
      "lastName": { "type": "string" },
      "age": { "$ref": "#/definitions/age" }
  },
  "definitions": {
    "age": { "type": "integer", "minimum": 0, "description": "Age in years" }
  }
}