Proposed change to atom:link element
Joe Gregorio: All of the discovery uses a link tag. The link tag from HTML will be used in (X)HTML, and the same tag will be used in the Atom format, with the restriction the value of the rel attribute is case sensitive.
This makes the definition of the link tag consistent with (X)HTML, and introduces a number of pre-existing link types. I could see the benefit of using this at either the feed or entry level.