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'?
Because 'alternate' is already in use. It has been non normatively
defined by HTML and used as such in HTML documents to point to
alternate representations of the document, such as Atom.
Well, if 'alternate' just stands for any arbitrary alternate, that's
fine with me. However, the above explanation makes this much more
specific, and says (or at least implies) that it is reserved for
the permalink, which would be different from how this is used in HTML.