[chrismorgan]

> For the publisher, it’s as easy as including [a link element or header] in the header of the content.

Well, you’ve got to poke the hub as well when changes occur, which makes it moderately incompatible with static site generation, requiring some kind of manual action after you publish, which could be comparatively straightforward if you use a site generator that allows you to define programmable post-publish hooks, or could be difficult if it doesn’t and you publish to something that doesn’t guarantee instant updates.