Links are separate from documents. They aren’t IN documents. The author of a document doesn’t have any greater authority over links than anybody else — they can create a bunch, and users can choose to apply them or not. The host that contains a document does not necessarily have any special association with the author, nor does it need to perform any coordination with or acknowledgement of links.
Instead, it’s closer to the ‘Rap Genius’ model — arbitrary users make arbitrary connections, annotations, rearrangements, and re-skins that are applied to the already-downloaded ‘original content’, and the user gets to choose which he or she would like to apply.
Hypertext is not about an author carefully controlling their brand by creating associations. It’s about a bunch of nerds sharing their own connections and footnotes and doing mashups & remixes of existing text.
You know how Thomas Jefferson took a knife to a bible & cut out all the supernatural stuff, then published his truncated version? Part of the point of Xanadu is that you could do that with the newest Hunger Games book, or literally combine the text with Interview with a Vampire, or whatever, and nobody could complain because the authors were getting paid for the passages that were kept from the originals.
It’s social footnoting. That’s the whole point. It’s for fandoms.
Even though I’m not a fan of copyright or micropayments in general, this is why I think they make sense in the Xanadu…