Aaron Parecki

This really is just pointing back to the question of what is the original goal of this spec. If the goal is to describe a way for consumers to subscribe to content, then yes, publisher->hub is not needed as part of the spec. Since that's what @julien51 described, then it sounds like the best course of action is to document the publisher->hub interaction separately, with the goal being to make it possible for publishers to use generic hubs.