The Symbolics manual was an 8,000-page document that was represented in a 10,000-node "hyperdocument" containing 23,000 links in all. The entire manual required 10 MB of storage space - a significant amount in 1985, even on the Lisp machines Symbolics sold. The Symbolics Document Examiner used a hierarchical structure, which differed from other experimental hypertext systems; it apparently was partially inspired by an even earlier hypertext system, the precursor to Texinfo which originated with Emacs."We saw no reason to have the underlying information structure be reflected in the user interface model unless that structure was a good model for interacting with information. My experience in trying to help users with a tree-structured information interface (the INFO subsystem in EMACS) led me to believe that a book-like interface would be more palatable for many people." pg 8 of Janet H. Walker's "Document Examiner: Delivery Interface for Hypertext Documents". 1987, Proceedings of the ACM conference on Hypertext
