{
  "$defs": {
    "Extensions": {
      "description": "Extensions is a map of extension keys to values.",
      "patternProperties": {
        "^(?:[a-z]|[a-z0-9][a-z0-9-+]*[a-z0-9])$": {
          "type": "string"
        }
      },
      "type": "object"
    }
  },
  "$id": "https://gobl.org/draft-0/tax/extensions",
  "$ref": "#/$defs/Extensions",
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}