content: {
    "$defs": {
      "DateTime": {
        "description": "Civil date time in simplified ISO format with no time zone\ninformation, for example: 2021-05-26T13:45:00",
        "format": "date-time",
        "title": "Date Time",
        "type": "string"
      }
    },
    "$id": "https://gobl.org/draft-0/cal/date-time",
    "$ref": "#/$defs/DateTime",
    "$schema": "https://json-schema.org/draft/2020-12/schema"
  }