json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "title": "Jsst Baz",
      "description": "An explanation about the purpose of this instance.",
      "properties": {
          "name": {
              "type": "string",
              "title": "Name schema.",
              "description": "An explanation about the purpose of this instance.",
              "default": "bob"
          },
          "unf": {
              "type": "object",
              "title": "Unf schema.",
              "description": "An explanation about the purpose of this instance.",
              "properties": {
                  "a": {
                      "type": "string",
                      "title": "A schema.",
                      "description": "An explanation about the purpose of this instance.",
                      "default": "a"
                  }
              },
              "required": [
                  "a"
              ]
          }
      },
      "required": [
          "name",
          "unf"
      ]
  }