@Override
  public void saveAdditionalData(@NotNull SdkAdditionalData additionalData, @NotNull Element additional) {
    if (additionalData instanceof UnknownSdkAdditionalData) {
      ((UnknownSdkAdditionalData)additionalData).save(additional);
    }
  }
@Override
  public void saveAdditionalData(@NotNull SdkAdditionalData additionalData, @NotNull Element additional)