content: {
    "$defs": {
      "Amount": {
        "description": "Quantity with optional decimal places that determine accuracy.",
        "pattern": "^\\-?[0-9]+(\\.[0-9]+)?$",
        "title": "Amount",
        "type": "string"
      }
    },
    "$id": "https://gobl.org/draft-0/num/amount",
    "$ref": "#/$defs/Amount",
    "$schema": "https://json-schema.org/draft/2020-12/schema"
  }