Creating XML data structure on iPhone

Is it correct, that there is no official API by Apple to create a well formed XML? I searched the web for a while but I开发者_如何学编程 just found some external frameworks to create XML data structures.

I need it for a web service call and would prefer a native API by Apple.

Of course I could just put together some Strings, but I think that's not the best way to do.

There's libxml2, which is supported API on the iPhone. Nothing higher-level, but there are plenty of third-party wrappers.