json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "properties": {
          "name": {
              "$ref": "#/definitions/Name"
          },
          "breed": {
              "$ref": "#/definitions/Breed"
          },
          "age": {
              "$ref": "#/definitions/Age"
          },
          "birthDate": {
              "$ref": "#/definitions/Date"
          }
      },
      "definitions": {
          "Name": {
              "type": "string"
          },
          "Age": {
              "type": "integer",
              "minimum": 0
          },
          "Breed": {
              "type": "string",
              "enum": [
                  "LABRADOR",
                  "BULLDOG",
                  "YORKSHIRE"
              ]
          },
          "Date": {
              "type": "string",
              "format": "date"
          }
      }
  }