[xml] best strategy for automatically supplying a top-level element?

[Chris Ryland <cpr emsoftware com>]

I'm designing a commercial XML-based language for document interchange 
(don't ask ;-) called UFO (unified/universal formatting objects). I'm a 
complete libxml newbie, though a real industry oldie (35 years, 
almost--ouch), and trying to get up to speed quickly.

For various reasons ("practicality beats purity", to steal a Python 
idiom) I need to auto-supply a top-level element wrapper (<ufo> ... 
</ufo>) if it's not supplied by the input.

Is the best way to do this to use the push interface to the parser, 
reading the first 1K or so and (skipping any <?xml...?> declaration and 
other PI's), inserting the initial <ufo> if missing and the final 
</ufo> later if ditto?

That seems like the simplest method, and avoids using the i/o buffer 
callback machinery.

Ideas? Brickbats? ;-) Thanks.

Cheers!
--Chris Ryland / Em Software, Inc. / www.emsoftware.com