{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "PointOfTime",
  "type": "object",
  "properties": {
    "point_of_time_type": {
      "type": "string",
      "description": "Type of the point of time. Possible values include: timestamp, offset, statement"
    },
    "reference": {
      "type": "string",
      "description": "Relation to the point of time.  Currently, the API supports `at` and `before`"
    }
  }
}