In his book, Literary Machines,
Ted Nelson described several
types of hypertext structures. Chunk hypertext is a traditonal
form of node-link hypertext with no explicit structure.
Collateral hypertext provides annotations or althernative points
of view. Stretch text can change form continuously.
Grand hypertext consists of everything a bout a subject or
pertinent to it collected in a single system. He has worked
for years on Project Xanadu (after "the magic place of literary
memory" in "Kubla Khan"), in which he hopes to eventually place
all of the world's literature online in a giant hypertext system.
His system even includes a means for protecting copyrights by
accounting for use and distributing royalties.
The real vision of Xanadu is a repository of everything that anybody has ever written, thus comprising a "truely universal hypertext" also called a "docuverse."
(Nelson,1987). Computer Lib/Dream Machines. Redmond, Wash.: Microsoft Press.