content: {
    "$defs": {
      "Key": {
        "description": "Text identifier to be used instead of a code for a more verbose but readable identifier.",
        "maxLength": 64,
        "minLength": 1,
        "pattern": "^(?:[a-z]|[a-z0-9][a-z0-9-+]*[a-z0-9])$",
        "title": "Key",
        "type": "string"
      }
    },
    "$id": "https://gobl.org/draft-0/cbc/key",
    "$ref": "#/$defs/Key",
    "$schema": "https://json-schema.org/draft/2020-12/schema"
  }