I agree. This is bullshit. Xerox PARC solved a superset of these compatability problems by 1985. It was called InterScript ( http://hopl.murdoch.edu.au/showlang

I agree. This is bullshit. Xerox PARC solved a superset of these compatability problems by 1985. It was called InterScript ( http://hopl.murdoch.edu.au/showlanguage.prx?exp=5455 http://hopl.murdoch.edu.au/showlanguage.prx?exp=5455 ) and it allows editors to preserve unknown elements within compound documents. This makes downward compatability quite trivial.