I have heard of Ted Nelson and Xanadu over the years. But I really don't understand what I'm looking at. Could someone compare and contrast with a more contemporary effort such as Federated Wiki?
you're looking at quotations and inclusion being transactional links instead of copy/paste. These links possibly involve micropayments. iirc, for Ted Nelson, this had the side effect of solving the copyright problem (for text, I guess) when viewing a document = following all the links to include quotations and other inclusions = micropayments.
Or at least that's what I remember from Literary Machines.