json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "definitions": {
          "pets": {
              "type": "object",
              "properties": {
                  "dog": {
                      "type": "array",
                      "items": {
                          "type": "string"
                      },
                      "minItems": 0,
                      "maxItems": 42
                  }
              }
          }
      },
      "properties": {
          "pets": {
              "$ref": "#/definitions/pets"
          }
      },
      "required": [
          "pets"
      ]
  }