Description of Apple's Keynote file format

What a nice surprise. Apple has actually documented the Keynote file format. Sadly, as far as I can see, there is no import/export capability in either PowerPoint nor OpenOffice.org Impress. That would be a nice feature. But it's good that Apple does document the format. Since it is XML, it is easy to parse. However the hard part is always the semantics, not the syntax...