json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "properties": {
          "person": {
              "type": "object",
              "properties": {
                  "first_name": {
                      "type": "string"
                  },
                  "last_name": {
                      "type": "string"
                  }
              },
              "required": [
                  "first_name",
                  "last_name"
              ],
              "additionalProperties": false
          }
      },
      "required": [
          "person"
      ]
  }