Atom protocol has been finalized
Good news today from Tim Bray: Atom protocol has been finalized. The final version of the spec is going to be Atom protocol draft #17.
Instead of staying up until the dawn hours (not naming names) reading the final Harry Potter book, I spent most of the weekend working on bringing Propono in-line with the draft #17 and in particular adding support for out-of-line categories and relative URIs. I've got code ready to commit that passes Tim's Ape tests, so hopefully we'll have a new Propono 0.6 release ready very soon that supports the final spec.
Roller's Atom protocol implementation is already up to date and passing Ape tests, so Roller 4.0 will be Atom protocol ready. I still need to do a little work to document the setup.