code: static XMLWriter<Person> writer(final String name) {
  		return XMLWriter.elem(name,
  			XMLWriter.elem("name").map(person -> person._name),
  			Email.WRITER.map(person -> person._email),
  			Link.WRITER.map(person -> person._link)
  		);
  	}
docs: /* *************************************************************************
  XML stream object serialization
  ***********************************************************************