{
  "title": "User",
  "type": "object",
  "x-stoplight": { "id": "root-id" },
  "properties": {
    "billing_address": {
      "type": "string",
      "title": "Billing Address",
      "x-stoplight": { "id": "billing_address-id" },
      "$ref": "#/$defs/Address"
    }
  },
  "$defs": {
    "Address": {
      "type": "object",
      "title": "Address",
      "x-stoplight": { "id": "address-id" },
      "properties": {
        "street": {
          "type": "string",
          "x-stoplight": { "id": "address-street-id" }
        }
      }
    }
  }
}