» 
Arabic Bulgarian Chinese Croatian Czech Danish Dutch English Estonian Finnish French German Greek Hebrew Hindi Hungarian Icelandic Indonesian Italian Japanese Korean Latvian Lithuanian Malagasy Norwegian Persian Polish Portuguese Romanian Russian Serbian Slovak Slovenian Spanish Swedish Thai Turkish Vietnamese
Arabic Bulgarian Chinese Croatian Czech Danish Dutch English Estonian Finnish French German Greek Hebrew Hindi Hungarian Icelandic Indonesian Italian Japanese Korean Latvian Lithuanian Malagasy Norwegian Persian Polish Portuguese Romanian Russian Serbian Slovak Slovenian Spanish Swedish Thai Turkish Vietnamese

definition - Project_Xanadu

definition of Wikipedia

   Advertizing ▼

Wikipedia

Project Xanadu

                   

Project Xanadu was the first hypertext project, founded in 1960 by Ted Nelson. Administrators of Project Xanadu have declared it an improvement over the World Wide Web, with mission statement: "Today's popular software simulates paper. The World Wide Web (another imitation of paper) trivialises our original hypertext model with one-way ever-breaking links and no management of version or contents."[1] Wired magazine called it the "longest-running vaporware story in the history of the computer industry".[2] The first attempt at implementation began in 1960, but it was not until 1998 that an implementation was released, and this was incomplete.

Contents

  History

During his first year as a graduate student at Harvard, Ted Nelson began implementing the system which contained the basic outline of what would become Project Xanadu: a word processor capable of storing multiple versions, and displaying the differences between these versions. Though he did not complete this implementation, a mockup of the system proved sufficient to inspire interest in others.[citation needed]

On top of this basic idea, Nelson wanted to facilitate nonsequential writing, in which the reader could choose his or her own path through an electronic document. He built upon this idea in a paper to the ACM in 1965, calling the new idea "zippered lists". These zippered lists would allow compound documents to be formed from pieces of other documents, a concept named transclusion. In 1967, while working for Harcourt, Brace, he named his project Xanadu, in honour of the poem "Kubla Khan" by Samuel Taylor Coleridge.

Ted Nelson published his ideas in his 1974 book Computer Lib/Dream Machines and the 1981 Literary Machines.

Computer Lib/Dream Machines is written in a non-sequential fashion: it is a compilation of Nelson's thoughts about computing, among other topics, in no particular order. It contains two books, printed back to back, to be flipped between. Computer Lib contains Nelson's thoughts on topics which angered him, while Dream Machines discusses his hopes for the potential of computers to assist the arts.

In 1972, Cal Daniels completed the first demonstration version of the Xanadu software on a computer Nelson had rented for the purpose, though Nelson soon ran out of money. In 1974, with the advent of computer networking, Nelson refined his thoughts about Xanadu into a centralised source of information, calling it a "docuverse".

In the summer of 1979, Nelson led the latest group of his followers, Roger Gregory, Mark S. Miller and Stuart Greene, to Swarthmore, Pennsylvania. In a house rented by Greene, they hashed out their ideas for Xanadu; but at the end of the summer the group went their separate ways. Miller and Gregory created an addressing system based on transfinite numbers which they called tumblers, which allowed any part of a file to be referenced.

The group continued their work, almost to the point of bankruptcy. In 1983, however, Nelson met John Walker, founder of Autodesk, at The Hackers Conference a conference originally for the people mentioned in Steven Levy's Hackers, and the group started working on Xanadu with Autodesk's financial backing.

According to economist Robin Hanson, in 1990 the first known corporate prediction market was used at Xanadu. Employees and consultants used it for example to bet on the cold fusion controversy at the time.

While at Autodesk, the group, led by Gregory, completed a version of the software, written in the C programming language, though the software did not work the way they wanted. However, this version of Xanadu was successfully demonstrated at The Hackers Conference and generated considerable interest. Then a newer group of programmers, hired from Xerox PARC, used the problems with this software as justification to rewrite the software in Smalltalk. This effectively split the group into two factions, and the decision to rewrite put a deadline imposed by Autodesk out of the team's reach. In August 1992, Autodesk divested the Xanadu group, which became the Xanadu Operating Company, which struggled due to internal conflicts and lack of investment.

Charles S. Smith, the founder of a company called Memex (named after a hypertext system proposed by Vannevar Bush[3]), hired many of the Xanadu programmers and licensed the Xanadu technology, though Memex soon faced financial difficulties, and the then-unpaid programmers left, taking the computers with them (the programmers were eventually paid). At around this time, Tim Berners-Lee was developing the World Wide Web. When the Web began to see large growth that Xanadu did not, Nelson's team grew defensive in the supposed rivalry that was emerging, but that they were losing. The 1995 Wired Magazine article "The Curse of Xanadu," provoked a harsh rebuttal from Nelson, but contention largely faded as the Web dominated Xanadu. [4]

In 1998, Nelson released the source code to Xanadu as Project Udanax, in the hope that the techniques and algorithms used could help to overturn some software patents.

In 2007, Project Xanadu released XanaduSpace 1.0.

  Original 17 rules

  1. Every Xanadu server is uniquely and securely identified.
  2. Every Xanadu server can be operated independently or in a network.
  3. Every user is uniquely and securely identified.
  4. Every user can search, retrieve, create and store documents.
  5. Every document can consist of any number of parts each of which may be of any data type.
  6. Every document can contain links of any type including virtual copies ("transclusions") to any other document in the system accessible to its owner.
  7. Links are visible and can be followed from all endpoints.
  8. Permission to link to a document is explicitly granted by the act of publication.
  9. Every document can contain a royalty mechanism at any desired degree of granularity to ensure payment on any portion accessed, including virtual copies ("transclusions") of all or part of the document.
  10. Every document is uniquely and securely identified.
  11. Every document can have secure access controls.
  12. Every document can be rapidly searched, stored and retrieved without user knowledge of where it is physically stored.
  13. Every document is automatically moved to physical storage appropriate to its frequency of access from any given location.
  14. Every document is automatically stored redundantly to maintain availability even in case of a disaster.
  15. Every Xanadu service provider can charge their users at any rate they choose for the storage, retrieval and publishing of documents.
  16. Every transaction is secure and auditable only by the parties to that transaction.
  17. The Xanadu client-server communication protocol is an openly published standard. Third-party software development and integration is encouraged.[5]

  See also

  Footnotes

  1. ^ Project homepage
  2. ^ Gary Wolf (June 1995). "The Curse of Xanadu". WIRED 3 (6). http://www.wired.com/wired/archive/3.06/xanadu_pr.html. 
  3. ^ "As We May Think" - The original article from the Atlantic Monthly archives
  4. ^ Reagle, Joseph Michael (2010). Good faith collaboration : the culture of Wikipedia. Cambridge, Mass.: MIT Press. ISBN 978-0-262-01447-2. 
  5. ^ Xanadu FAQ: What requirements do Xanadu systems aim to meet?, 2002-04-12 by Andrew Pam

  References

  External links

   
               

 

All translations of Project_Xanadu


sensagent's content

  • definitions
  • synonyms
  • antonyms
  • encyclopedia

Dictionary and translator for handheld

⇨ New : sensagent is now available on your handheld

   Advertising ▼

sensagent's office

Shortkey or widget. Free.

Windows Shortkey: sensagent. Free.

Vista Widget : sensagent. Free.

Webmaster Solution

Alexandria

A windows (pop-into) of information (full-content of Sensagent) triggered by double-clicking any word on your webpage. Give contextual explanation and translation from your sites !

Try here  or   get the code

SensagentBox

With a SensagentBox, visitors to your site can access reliable information on over 5 million pages provided by Sensagent.com. Choose the design that fits your site.

Business solution

Improve your site content

Add new content to your site from Sensagent by XML.

Crawl products or adds

Get XML access to reach the best products.

Index images and define metadata

Get XML access to fix the meaning of your metadata.


Please, email us to describe your idea.

WordGame

The English word games are:
○   Anagrams
○   Wildcard, crossword
○   Lettris
○   Boggle.

Lettris

Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.

boggle

Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !

English dictionary
Main references

Most English definitions are provided by WordNet .
English thesaurus is mainly derived from The Integral Dictionary (TID).
English Encyclopedia is licensed by Wikipedia (GNU).

Copyrights

The wordgames anagrams, crossword, Lettris and Boggle are provided by Memodata.
The web service Alexandria is granted from Memodata for the Ebay search.
The SensagentBox are offered by sensAgent.

Translation

Change the target language to find translations.
Tips: browse the semantic fields (see From ideas to words) in two languages to learn more.

last searches on the dictionary :

4351 online visitors

computed in 0.031s

   Advertising ▼

I would like to report:
section :
a spelling or a grammatical mistake
an offensive content(racist, pornographic, injurious, etc.)
a copyright violation
an error
a missing statement
other
please precise:

Advertize

Partnership

Company informations

My account

login

registration

   Advertising ▼