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LA GRAMMATICA DI ENGLISH GRATIS IN VERSIONE MOBILE   INFORMATIVA PRIVACY

  NUOVA SEZIONE ELINGUE

 

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                                                                                         ESERCIZI :   Serie 1 - 2 - 3  - 4 - 5  SERVIZI:   Pronunciatore di inglese - Dizionario - Convertitore IPA/UK - IPA/US - Convertitore di valute in lire ed euro                                              

 

 

WIKIBOOKS
DISPONIBILI
?????????

ART
- Great Painters
BUSINESS&LAW
- Accounting
- Fundamentals of Law
- Marketing
- Shorthand
CARS
- Concept Cars
GAMES&SPORT
- Videogames
- The World of Sports

COMPUTER TECHNOLOGY
- Blogs
- Free Software
- Google
- My Computer

- PHP Language and Applications
- Wikipedia
- Windows Vista

EDUCATION
- Education
LITERATURE
- Masterpieces of English Literature
LINGUISTICS
- American English

- English Dictionaries
- The English Language

MEDICINE
- Medical Emergencies
- The Theory of Memory
MUSIC&DANCE
- The Beatles
- Dances
- Microphones
- Musical Notation
- Music Instruments
SCIENCE
- Batteries
- Nanotechnology
LIFESTYLE
- Cosmetics
- Diets
- Vegetarianism and Veganism
TRADITIONS
- Christmas Traditions
NATURE
- Animals

- Fruits And Vegetables



ARTICLES IN THE BOOK

  1. Atom
  2. Audioblogging
  3. Blog Carnival
  4. Blogcast
  5. Blog feed
  6. Blog fiction
  7. Blogger.com
  8. Bloggies
  9. Blogosphere
  10. Blogroll
  11. Blog software
  12. Citizen journalism
  13. Collaborative blog
  14. Community Server
  15. Content Management System
  16. Corporate blog
  17. Dooce
  18. Edublog
  19. Electronic literature
  20. Escribitionist
  21. Facebook
  22. Flaming
  23. Forum moderator
  24. Fotolog
  25. GNU General Public License
  26. Google bomb
  27. Google Reader
  28. Inauthentic Text
  29. International Weblogger's Day
  30. Internet Troll
  31. Linkback
  32. Link rot
  33. List of blogging terms
  34. LiveJournal
  35. Massively distributed collaboration
  36. Micropatronage
  37. Moblog
  38. Moderation system
  39. Movable Type
  40. MySpace
  41. MySQL
  42. News aggregator
  43. Online diary
  44. OPML
  45. PageRank
  46. Permalink
  47. Personal journal
  48. Photoblog
  49. Pingback
  50. Ping-server
  51. Podcasting
  52. Political blog
  53. Project blog
  54. Rating community
  55. Reputation management
  56. Reputation system
  57. RSS
  58. Social media
  59. Spam blog
  60. Spamdexing
  61. Spam in blogs
  62. Sping
  63. Technorati
  64. TrackBack
  65. User generated content
  66. Virtual Community
  67. Vlog
  68. Weblog
  69. Windows Live Spaces
  70. WordPress.com
  71. Wordpress
  72. Yahoo 360°
  73. YouTube

 


 

 
CONDIZIONI DI USO DI QUESTO SITO
L'utente può utilizzare il nostro sito solo se comprende e accetta quanto segue:

  • Le risorse linguistiche gratuite presentate in questo sito si possono utilizzare esclusivamente per uso personale e non commerciale con tassativa esclusione di ogni condivisione comunque effettuata. Tutti i diritti sono riservati. La riproduzione anche parziale è vietata senza autorizzazione scritta.
  • Il nome del sito EnglishGratis è esclusivamente un marchio e un nome di dominio internet che fa riferimento alla disponibilità sul sito di un numero molto elevato di risorse gratuite e non implica dunque alcuna promessa di gratuità relativamente a prodotti e servizi nostri o di terze parti pubblicizzati a mezzo banner e link, o contrassegnati chiaramente come prodotti a pagamento (anche ma non solo con la menzione "Annuncio pubblicitario"), o comunque menzionati nelle pagine del sito ma non disponibili sulle pagine pubbliche, non protette da password, del sito stesso.
  • La pubblicità di terze parti è in questo momento affidata al servizio Google AdSense che sceglie secondo automatismi di carattere algoritmico gli annunci di terze parti che compariranno sul nostro sito e sui quali non abbiamo alcun modo di influire. Non siamo quindi responsabili del contenuto di questi annunci e delle eventuali affermazioni o promesse che in essi vengono fatte!
  • L'utente, inoltre, accetta di tenerci indenni da qualsiasi tipo di responsabilità per l'uso - ed eventuali conseguenze di esso - degli esercizi e delle informazioni linguistiche e grammaticali contenute sul siti. Le risposte grammaticali sono infatti improntate ad un criterio di praticità e pragmaticità più che ad una completezza ed esaustività che finirebbe per frastornare, per l'eccesso di informazione fornita, il nostro utente. La segnalazione di eventuali errori è gradita e darà luogo ad una immediata rettifica.

     

    ENGLISHGRATIS.COM è un sito personale di
    Roberto Casiraghi e Crystal Jones
    email: robertocasiraghi at iol punto it

    Roberto Casiraghi           
    INFORMATIVA SULLA PRIVACY              Crystal Jones


    Siti amici:  Lonweb Daisy Stories English4Life Scuolitalia
    Sito segnalato da INGLESE.IT

 
 



THE BOOK OF BLOGS
This article is from:
http://en.wikipedia.org/wiki/Link_rot

All text is available under the terms of the GNU Free Documentation License: http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License 

Link rot

From Wikipedia, the free encyclopedia

 

Link rot is the process by which links on a website gradually become irrelevant or broken as time goes on, because websites that they link to disappear, change their content or redirect to new locations.

The phrase also describes the effects of failing to update webpages so that they become out-of-date, containing information that is old and useless, and that clutters up search engine results. This process most frequently occurs in personal web pages and is prevalent in free webhosts such as GeoCities, where there is no financial incentive to fix link rot (most of these sites have not been updated for years on end).

Prevalence

The 404 "not found" response is familiar to even the occasional Web user. A number of studies have examined the prevalence of link rot on the Web, in academic literature, and in digital libraries. In a 2003 experiment, Fetterly et al. (2003) discovered that about 0.5% of web pages disappeared each week. McCown et al. (2005) discovered that half of the URLs cited in D-Lib Magazine articles were no longer accessible 10 years after publication, and other studies have shown link rot in academic literature to be even worse (Spinellis, 2003, Lawrence et al., 2001). Nelson and Allen (2002) examined link rot in digital libraries about found that 3% of the objects were no longer accessible after one year.

News sites contribute to the link rot problem by commonly keeping only recent news articles online where they are freely accessible at their original URLs, then removing them or moving them to a paid subscription area. This causes a heavy loss of supporting links in sites discussing newsworthy events and using news sites as references.

Discovering

Detecting link rot for a given URL is difficult using automated methods. If a URL is accessed and returns back an HTTP 200 (OK) response, it may be considered accessible, but the contents of the page may have changed and may no longer be relevant. Some web servers also return a soft 404, a page returned with a 200 (OK) response (instead of a 404) that indicates the URL is no longer accessible. Bar-Yossef et al. (2004) developed a heuristic for automatically discovering soft 404s.

Modern management

On Wikipedia, and other Wiki-based websites, broken external links still present a maintenance problem - at least 10% of the external links on Wikipedia are broken. Wikipedia uses a clear color system with internal links, so the user can see if the link is live before clicking on it. If referencing an old website or dated information, users can externally link to pages using a web archiving service, allowing for a reliable permanent link.

Combating

Web archiving

To combat link rot, web archivists are actively engaged in collecting the Web or particular portions of the Web and ensuring the collection is preserved in an archive, such as an archive site, for future researchers, historians, and the public. The largest web archiving organization is the Internet Archive which strives to maintain an archive of the entire Web. National libraries, national archives and various consortia of organizations are also involved in archiving culturally important Web content.

Individuals may also use a number of tools that allow them to archive web resources that may go missing in the future:

  • WebCite, a tool specifically for scholarly authors, journal editors and publishers to permanently archive "on-demand" and retrieve cited Internet references (Eysenbach and Trudel, 2005).
  • Archive-It, a subscription service that allows institutions to build, manage and search their own web archive
  • hanzo:web is a personal web archiving service created by Hanzo Archives that can archive a single web resource, a cluster of web resources, or an entire website, as a one-off collection, scheduled/repeated collection, an RSS/Atom feed collection or collect on-demand via Hanzo's open API.

Webmasters

Webmasters have developed a number of best-practices for combating link rot:

  • Avoiding unmanaged hyperlink collections
  • Avoiding links to pages deep in a website ("deep linking")
  • Using hyperlink checking software or a Content Management System (CMS) that automatically checks links
  • Using permalinks
  • Using redirection mechanisms (e.g. "301: Moved Permanently") to automatically refer browsers and crawlers to the new location of a URL

Authors citing URLs

A number of studies have shown how wide-spread link rot is in academic literature (see below). Authors of scholarly publications have also developed best-practices for combating link rot in their work:

  • Avoiding URL citations that point to resources on a researcher's personal home page (McCown et al., 2005)
  • Using Persistent Uniform Resource Locators (PURLs) and digital object identifiers (DOIs) whenever possible
  • Using web archiving services (e.g. WebCite) to permanently archive and retrieve cited Internet references (Eysenbach and Trudel, 2005).

References

Link rot on the Web

  • Ziv Bar-Yossef, Andrei Z. Broder, Ravi Kumar, and Andrew Tomkins (2004). "Sic transit gloria telae: towards an understanding of the Web’s decay". Proceedings of the 13th international conference on World Wide Web: 328–337.

Ironically, the link to www2004.org is an example of link rot; it is no longer valid.

  • Tim Berners-Lee (1998). "Cool URIs Don’t Change". 
  • Gunther Eysenbach and Mathieu Trudel (2005). "Going, going, still there: using the WebCite service to permanently archive cited web pages". Journal of Medical Internet Research 7 (5). 
  • Dennis Fetterly, Mark Manasse, Marc Najork, and Janet Wiener (2003). "A large-scale study of the evolution of web pages". Proceedings of the 12th international conference on World Wide Web.
  • Wallace Koehler (2004). "A longitudinal study of web pages continued: A consideration of document persistence". Information Research 9 (2). 
  • John Markwell and David W. Brooks (2002). "Broken Links: The Ephemeral Nature of Educational WWW Hyperlinks". Journal of Science Education and Technology 11 (2): 105-108. 

In academic literature

  • Robert P. Dellavalle, Eric J. Hester, Lauren F. Heilig, Amanda L. Drake, Jeff W. Kuntzman, Marla Graber, Lisa M. Schilling (2003). "Going, Going, Gone: Lost Internet References". Science 302 (5646): 787-788. 
  • Steve Lawrence, David M. Pennock, Gary William Flake, Robert Krovetz, Frans M. Coetzee, Eric Glover, Finn Arup Nielsen, Andries Kruger, C. Lee Giles (2001). "Persistence of Web References in Scientific Research". Computer 34 (2): 26-31. 
  • Frank McCown, Sheffan Chan, Michael L. Nelson, and Johan Bollen (2005). "The Availability and Persistence of Web References in D-Lib Magazine". Proceedings of the 5th International Web Archiving Workshop and Digital Preservation (IWAW'05).
  • Diomidis Spinellis (2003). "The Decay and Failures of Web References". Communications of the ACM 46 (1): 71-77. 

In digital libraries

  • Michael L. Nelson and B. Danette Allen (2002). "Object Persistence and Availability in Digital Libraries". D-Lib Magazine 8 (1). 

See also

  • Digital preservation
  • Uniform Resource Locator
  • Web archiving
  • WebCite

External links

  • Future-Proofing Your URIs
  • Jakob Nielsen on link rot
  • Warrick - a tool for recovering lost websites from the Internet Archive and search engine caches
Retrieved from "http://en.wikipedia.org/wiki/Link_rot"