> It seems to be assumed that authors would mark up their embedded resources in a
> semantically accurate way. If the history of the Web is any indication (and it

As we are talking about XHTML 2.0, that ought to be a reasonable assumption.

Unless people start using it to be fashionable, the people who don't
understand structural markup would be much better off sticking with
HTML 4.01 (IE).  They are not going to like XHTML 2.0.