{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/TimePeriodBase",
  "title": "TimePeriodBase",
  "allOf": [
    {
      "$ref": "#/components/schemas/TimePeriodCompact"
    },
    {
      "type": "object",
      "properties": {
        "parent": {
          "allOf": [
            {
              "$ref": "#/components/schemas/TimePeriodCompact"
            },
            {
              "nullable": true
            }
          ]
        }
      }
    }
  ]
}