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World Wide Web

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World Wide Web. COMP 101. Spring Semester, 2006 (Last Modified: 2006/2/16) A computer system ... World Wide Web Consortium (W3C) for standards ... – PowerPoint PPT presentation

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Title: World Wide Web


1
World Wide Web
  • COMP 101
  • Spring Semester, 2006
  • (Last Modified 2006/2/16)

2
A computer system
Applications
Operating System
Device Drivers
3
A killer application
  • Invented by Tim Berners-Lee at CERN around 1990
  • Based on the hypertext concept
  • Allows information retrieval over the Internet
    with little training
  • Handles text, graphics, voice, video, programs,
    etc.
  • Supports various levels of privacy

4
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5
Popular browsing tools
  • Microsoft Internet Explorer (IE)
  • Netscape Communicator
  • Mozilla
  • Opera (for mobile devices)
  • A few research browsers, such as the W3C Amaya

6
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7
Basic elements of WWW
  • Each information repository must have a unique
    Internet address called the Uniform Resource
    Locator (URL) (e.g., www.cs.ust.hk).
  • The address (not necessarily starting with www)
    is registered with a Web server at the users
    organization or at an Internet service provider.
  • A data file may contain URL links to other
    relevant information repositories.

8
Information on the WWW
  • Coded in the Hyper Text Markup Language (HTML) or
    its descendants
  • Transferred using the Hyper Text Transfer
    Protocol (HTTP)

9
Finding information on WWW
  • www.google.com
  • www.yahoo.com
  • And many others that use Web crawlers to follow
    links and index the keywords for fast retrieval
  • Funded mainly by advertisers
  • Use Boolean operators (AND, OR, NOT) to limit
    searches

10
Privacy on the WWW
  • Web servers often use cookies to track users
    browsing habits.
  • Cookies are small files placed by the Web server
    in a directory of the users computer.
  • A cookie is meaningful only to the Web server who
    placed it there.
  • A privacy concern?

11
Business transactions on WWW
  • Use secure connection (https) before entering
    personal data.
  • Make sure the company/site is legitimate.

12
Governance of the WWW
  • World Wide Web Consortium (W3C) for standards
  • World Wide Web Conference (WWWn) for latest
    development

13
Future of the WWW
  • Services, in addition to contents
  • Machines, in addition to people

14
Technology evolution
Internet
Services on demand
WWW
Web services
HTML
WSDL SOAP UDDI
OGSA
15
Maturing technology
  • Internet e-mails and file transfers
    (human-to-human through machines)
  • WWW getting information (human-to-machine)
  • Web services getting work done
    (machine-to-machine)
  • Grid computing computing on demand (future
    possibility)

16
Building a SUPER Web
  • SafeNo violation of privacy
  • UsableEqual access by all
  • ProductiveRaising levels of abstraction
  • EconomicalRewards to contributors
  • RobustResistance to sporadic failures
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