The .txt versions of the files served from
http://www.ietf.org/internet-drafts are the
normative versions and should be the ones you link to
when referrring to either the Format or the Protocol.
With that understanding,
alternate versions of the
Publishing Protocol are available in HTML, XML and
a side-by-side diff in HTML showing changes from the previous
version. As usual all feedback must be routed
to the atom-syntax mailing list.