Suggestion:
|rel="alternate"| - This is the permalink for the complete entry |rel="about"| - The entry is about this link. |rel="related"| - This link is related to the link the entry is about |rel="via"| = This is the source of the link the entry is about
Objections, anyone?
'about' and 'related' sound straightforward. But for the permalink, 'alternate' sounds strange/will be difficult to understand. Why not just 'perma' or 'permalink'? And instead of 'via', I guess 'source' will be easier, too.