'The value of "rel" MUST be either a name, which is non-empty and does not contain any colon (":") characters, or a URI [RFC2396bis, section 3].'
Are we going to allow relative URIs? Or shall we change that to:
'The value of "rel" MUST be either a name, which is non-empty and does not contain any colon (":") characters, or an absolute URI [RFC2396bis, section 4.3].'
I can't think of any reason to allow relative URIs...nor any reason why anyone would attempt to use one...so maybe it doesn't matter that much. But unless there would be some value in allowing relative URIs, we may as well nail this down more tightly.
