content: {
    "$defs": {
      "String": {
        "description": "Map of 2-Letter language codes to their translations.",
        "patternProperties": {
          "^[a-z]{2}$": {
            "title": "Text in given language.",
            "type": "string"
          }
        },
        "title": "Multi-language String",
        "type": "object"
      }
    },
    "$id": "https://gobl.org/draft-0/i18n/string",
    "$ref": "#/$defs/String",
    "$schema": "https://json-schema.org/draft/2020-12/schema"
  }