json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "A list of books",
      "type": "array",
      "items": {
          "$schema": "http://json-schema.org/draft-04/schema#",
          "title": "BookRecord",
          "description": "A book record",
          "type": "object",
          "properties": {
              "id": {
                  "type": "integer",
                  "description": "The id of the book"
              },
              "title": {
                  "type": "string",
                  "description": "Book title"
              },
              "author": {
                  "type": "string",
                  "description": "Book author"
              },
              "isbn": {
                  "type": "string",
                  "description": "Book ISDB (optional)"
              }
          },
          "required": [
              "id",
              "title",
              "author"
          ]
      }
  }