json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "Example Schema",
      "type": "object",
      "properties": {
          "firstName": {
              "type": "string"
          },
          "lastName": {
              "type": "string"
          },
          "age": {
              "description": "Age in years",
              "type": "integer",
              "minimum": 0
          }
      },
      "required": [
          "firstName",
          "lastName"
      ]
  }