The Semantic Web, A new form of Web content that is meaningful to computers will unleash a revolutio

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The Semantic Web, A new form of Web content that
is meaningful to computers will unleash a
revolution of new possibilities

• TIM BERNERS-LEE,JAMES HENDLER and ORA LASSILA
• Scientific America, 2002

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About The Author

• Tim Berners-Lee
• Director of the World Wide Web Consortium
• Inventor of the Web
• Weaving The Web (1999)
• Information Management A Proposal (1989)

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Schedule

• Features of Semantic Web
• Knowledge Representation
• Challenge and Task
• Standard
• Future

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An Example
Science Fiction?
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Expressing Meaning

• Computers have no reliable way to process the
  semantics.
• Semantic Web will bring structure to the
  meaningful content of web pages
• Semantic Web is an extension of the current web.

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Decentralize

• Every node has its own contentwww.itwindsor.com
  music.itwindsor.com linux.itwindsor.com
• The Web has no consistency of its interconnections

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Knowledge Representation

• KR Structured collections of information and
  sets of inference rules for automated reasoning
• 1, Traditional KR system is centralized
• 2, Its limited to prevent unanswerable
  question/paradox

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Challenge of SW

• To provide a language which can express data and
  rules for reasoning about the data
• Allows existing rules can be exported on to the
  web

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XML/RDF

• XML Add arbitrary structure to documents
• RDF Encode meaning in sets of triples

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Ontology Task 1

• Avoid using the same term to mean different
  thingsAddress mailing address billing
  address
• Solution Different URI (Universal Resource
  Identifier), Namespace

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Ontology Task 2

• Clarify the same concept using different
  names zip code post code
• Solution Classes, relations between classes.

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Further Ontology Task

• Inference
• a Cornell University addrresin Ithacamust be
  in New York Statein the U.S.gt the address
  should use U.S. Standards
• 410 Thurston Ave, Ithaca, NY

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Further Ontology Task

• Agents programs that collect Web content from
  diverse sources, process the information and
  exchange the results with other programs.
• Cooperate between agents exchange of
  proofs digital signature

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Standards

• (Microsoft Universal Plug and Play, Jini)
• Rely heavily on standardization of a
  predetermined set of functionality descriptions.
  Cant anticipate all possible future needs
• Semantic Web Agents can reach a shared
  understanding by exchanging ontology

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Into our life

• Semantic Web can be deployed into cell phones,
  TVs.
• Trivial example volume control of TV/DVD/MP3

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Future

• Assist the evolution of human knowledge
• Coordinate actions across a large
  group/national/international
• Let anyone express new concepts

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Question?