Prospect, I was just reading the epub guide last night. While I am glad that Adobe has a mechanism to do the numbeing (and a few other extensions to epub), I am leary of using such extensions. If you use them, you're epub is no longer standard, but proprietary Adobe. I don't know whether Adobe is simply trying to address some of the current epub shortcomings, or if they are trying to pollute the standard and drive customers to their own solutions. (Paranoia mode on) Perhaps they are even doing this to force future versions of the epub spec to include their way of doing things, instead of some other way, which may be better.
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