This notion of associative indexing led Bush to identify two of the chief characteristics of hypertext systems.
1) The ability to make and follow links. As Bush notes 'the tying of two items together is the important thing'
2) The ability of authors to record their mental trails for others to use.
history------coined by Ted Nelson in the 1960s, he devised his own hypertext system called Xanadu.
The Xanadu web site notes the following features of Xanadu:
* UNBREAKABLE LINKS
* COPYRIGHT SIMPLIFICATION AND SOFTENING: by special permissions and methods, quotations of any size may be used by anyone and mixed together frictionlessly.
* ORIGIN CONNECTION: All quotations and excerpts stay connected to their original.
* TWO-WAY LINKS: anyone may publish connected comments to any page.
* SIDE-BY-SIDE INTERCOMPARISON OF CONNECTED DOCUMENTS-- showing two-way links, differences between versions, origins of contexts.
* DEEP VERSION MANAGEMENT: documents may be changed incrementally
versions may branch; authors may easily see exact differences between versions.* INCREMENTAL PUBLISHING
Zig Zag----------"a new structure for building anything-- crossed lists in many dimensions.... ZigZag structure may greatly simplify casual database, casual programming, user-reconfigurable sofware, and casual visualization (made easier by the availability of multiple dimensions)."
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