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Exploring The Semantic Web

Exploring The Semantic Web. Answering slightly more than What Is It?. April 2005 University of Brighton. Overview. What is the Semantic Web The Semantic Web Stack Logic RDF OWL. So, What Is It?. Seeking meaning lost behind data Associations between known facts. The Semantic Web Stack.

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Exploring The Semantic Web

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  1. Exploring The Semantic Web Answering slightly more than What Is It? April 2005University of Brighton

  2. Overview • What is the Semantic Web • The Semantic Web Stack • Logic • RDF • OWL

  3. So, What Is It? • Seeking meaning lost behind data • Associations between known facts

  4. The Semantic Web Stack http://www.w3.org/2003/Talks/1022-Madrid-IH/32.html

  5. Semantic Web Stack: URI • URI • http://www.amazon.com/ • http://xmlns.com/foaf/0.1/Document/

  6. Logic: Syllogisms Humans are mortal Greeks are humans Therefore Greeks are mortal Major premise Minor premise Conclusion • Peter created the document in question • The document’s author studied in London

  7. Resource Description Framework • Knowledge Representation Language • Triples – in fact Syllogisms

  8. RDF Triples - Description • Film ‘Monty Python’s Life Of Brian’ • Directed by ‘Terry Jones’ • IMDB information online at: • Film: http://imdb.com/title/tt0079470/ • Director: http://imdb.com/name/nm0001402/

  9. RDF Triples - Statements • (http://www.imdb.com/title/tt0079470/, rdf:type, imdb:film) • (http://www.imdb.com/title/tt0079470/, dc:title, “Life of Brian”)

  10. RDF Triples - Diagram

  11. Expansion • Use further RDF Triples to gain insight • For instance the Director’s name • RDF has a long lead time

  12. RDF Example • <rss:slide rdf:about="http://grobbins.co.uk/semweb/talk/"> • <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Document"/> • <rss:title>Exploring The Semantic Web</rss:title> • <rss:subtitle> • Answering slightly more than, What Is It? • </rss:subtitle> • <dc:creator>Graham Robbins</dc:creator> • <dc:organisation>University of Brighton</dc:organisation> • <dc:date>April 2005</dc:date> • <rss:description> • Slides presented as Component four of the Dissertation Module, University of Brighton, April 2005 </rss:description> • <rss:link>http://grobbins.co.uk/semweb/talk/</rss:link> • </rss:slide>

  13. Ontology – with a small o • Conceptualisation of the real world • Absent of ambiguity • Representing essence behind knowledge

  14. Knowledge Representation • Opposing meaning John sang strangely Strangely John sang • Ambiguous terminology • String and Character • Concept terminology • Person, Teenager then Adult / Client then User • Young Lady, Teenager

  15. Web Ontology Language • Describe, through definition, a domain • Computerised reasoning • represents objects humans know • computers can learn about these objects • Then, apply reasoning

  16. A Little Knowledge… • What is knowledge? • Improving understanding • Greater awareness of surroundings • Industry Domain • Focused and reasoned • Correct or incorrect • Authoritative knowledge

  17. … is a dangerous thing • False knowledge presented as true • Review by Hammersmith and Fulham social services: “… 48% of the department’s records, covering nearly 55,000 people, did not match the local NHS database. About 3% of the records, 1,445, disagreed on whether a person was alive or dead, and 1% on gender.” (Batty 2003)

  18. Realising the web • Need for structure • Changing work patterns • Generating understanding for a Semantic Web

  19. Summary • Not a new Internet • An additional layer • Information extended • Well-defined meanings • Machine-Processable • “ubiquitous and devastatingly powerful” (Shirky 2003).

  20. Questions? Further Research Dissertation http://www.grobbins.co.uk/semweb/ W3C http://www.w3.org/2001/sw/

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