Original sentence: Furthermore, Xanadu addresses document version tracking, while the web doesn't.In Xanadu, links would never be broken, because documents would be distributed in a peer-to-peer fashion, so there would be no need for the ever-present 404 errors.The web was easy to implement on top of existing file systems, and can be added to by autonomous individuals, while Xanadu is more difficult to implement, relying on cooperation.Transclusion in Xanadu allows two-way links between any part of documents, whereas the web only has one-way linking to complete documents, or to "anchors" determined by the document author.Why the World Wide Web became popular instead of Xanadu: Project Xanadu is more ambitious than the web