json_schema: {
      "additionalProperties": false,
      "description": "Context containing ID of parent event (useful for annotating events derived from other events)",
      "properties": {
          "parentEventId": {
              "_format": "uuid",
              "type": "string"
          }
      },
      "required": [
          "parentEventId"
      ],
      "self": {
          "format": "jsonschema",
          "name": "parent_event",
          "vendor": "com.snowplowanalytics.snowplow",
          "version": "1-0-0"
      },
      "type": "object"
  }