content: {
    "$defs": {
      "Period": {
        "description": "Period represents two dates with a start and finish.",
        "properties": {
          "end": {
            "$ref": "https://gobl.org/draft-0/cal/date",
            "description": "End indicates when the period ends, and must be after the start date.",
            "title": "End"
          },
          "label": {
            "description": "Label is a short description of the period.",
            "title": "Label",
            "type": "string"
          },
          "start": {
            "$ref": "https://gobl.org/draft-0/cal/date",
            "description": "Start indicates when this period starts.",
            "title": "Start"
          }
        },
        "required": [
          "start",
          "end"
        ],
        "type": "object"
      }
    },
    "$id": "https://gobl.org/draft-0/cal/period",
    "$ref": "#/$defs/Period",
    "$schema": "https://json-schema.org/draft/2020-12/schema"
  }