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Hi JSWolf,
How would you want it to handle the following:
nav document - keep it or discard it?
html5 specific tags - these don't exist in xhtml1.1 - keep or strip out, or comment out?
epub3 specific attributes such as data-* and epub-type and ...
smil, pls accessibility features - how would you deal with those?
javascripts - how should those be dealt with?
etc.
As you can see it is much easier to go from valid epub2 to epub3 since 3 is generally a superset of 2, but going the opposite way will be quite hard and could easily end up losing lots of pieces and functionality. I am not sure it can be done in any rational way unless the epub3 book used no new features over the epub3 set.
KevinH
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