json_schema: {
      "additionalProperties": false,
      "description": "Top-level schema for the validation process (Iglu-only)",
      "properties": {
          "data": {},
          "schema": {
              "pattern": "^iglu:[a-zA-Z0-9-_.]+/[a-zA-Z0-9-_]+/[a-zA-Z0-9-_]+/[0-9]+-[0-9]+-[0-9]+$",
              "type": "string"
          }
      },
      "required": [
          "schema",
          "data"
      ],
      "self": {
          "format": "jsonschema",
          "name": "instance-iglu-only",
          "vendor": "com.snowplowanalytics.self-desc",
          "version": "1-0-0"
      },
      "type": "object"
  }