docs: public String toStringOf(String elementName, Object element) {
      try {
        StringWriter writer = new StringWriter();
        XmlSerializer serializer = Xml.createSerializer();
        serializer.setOutput(writer);
        serialize(serializer, elementName, element, false);
        return writer.toString();
      } catch (IOException e) {
        throw new IllegalArgumentException(e);
      }
    }