json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "description": "Your best friend",
      "properties": {
          "name": {
              "type": "string",
              "description": "How to call the dog"
          },
          "age": {
              "type": "integer",
              "description": "Number of years ( > 0 )",
              "minimum": 0
          },
          "owner": {
              "$ref": "#/definitions/Person",
              "description": "The person taking care of the dog"
          },
          "breed": {
              "$ref": "#/definitions/Breed",
              "description": "The breed if pure"
          }
      },
      "definitions": {
          "Person": {
              "type": "object",
              "description": "A human being",
              "properties": {
                  "name": {
                      "type": "string"
                  }
              }
          },
          "Breed": {
              "type": "string",
              "description": "Most popular breeds",
              "enum": [
                  "LABRADOR",
                  "BULLDOG",
                  "YORKSHIRE"
              ]
          }
      }
  }