Semantic Web: Intro

PastSemantic Brain

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contain

NowSemantic Web

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contain

Definition

The Semantic Web is an extension of the current web in which information is given

well-defined meaning, better

enabling computers and people to work in cooperation

TBL

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Why?

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What we see

Why?

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What computers see

Web Evolution

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SW Principles

• URI• Ontology/Shared Vocabulary• Linked Open Data

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Five-star Rating Scheme

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RDF

• Data exchange format• Used for describing things• Key features:– RDF links things, not just documents– RDF links are typed

mybook link thatbookshop

mybook forSaleIn thatbookshop

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OWL

• Web knowledge representation language• More semantics, extends the expressivity– owl:equivalentClass– owl:equivalentProperty– owl:inverseFunctionalProperty– owl:inverseOf

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Description Logic

• Logical formalism for OWL

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SPARQL• SQL-like language for querying RDF• Graph pattern matching

Example:

Data<http://example.org/book1> <http://purl.org/title> "Tutorial" .

Query

SELECT ?title WHERE { <http://example.org/book1> <http://purl.org/title> ?title . }

Result“Tutorial”

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Open World Reasoning

If something is unknown, unknown

instead of

If something is unknown, false

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Internet of Things

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Use Casedata.gov

• Dataset repository and mashup• http://www.data.gov/

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Use CaseDBPedia

• Text annotation based on Wikipedia knowledge

• http://dbpedia.org/spotlight

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Use CaseGoogle Recipe

• Faceted search• http://google.com/landing/recipes

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Use CaseFacebook OGP

• Light-weight version of Semantic Web• Implemented using RDFa• Integrate web pages into the social graph

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Fariz Darari @ http://ir.cs.ui.ac.id/

<meta property="og:title" content="Oceans (Disneynature's Oceans)" />

<meta property="og:type" content="movie" />

<meta property="og:image" content="http://content9.flixster.com/movie/11/04/79/11047971_pro.jpg" />

<meta property="og:url" content="http://www.rottentomatoes.com/m/10011268-oceans/" />

Fariz Darari @ http://ir.cs.ui.ac.id/

Fariz Darari @ http://ir.cs.ui.ac.id/

Fariz Darari @ http://ir.cs.ui.ac.id/

@ Facebook Profile Page

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References

• http://www.w3.org/• http://suttonhoo.blogspot.com/• http://www.flickr.com/photos/kasei/• http://www.flickr.com/photos/johnkarakatsanis/• http://linkeddatabook.com/• http://www.techrepublic.com/whitepapers/web4web-e-

collaboration-tools/2143683• http://www.w3.org/DesignIssues/LinkedData.html• http://www.comlab.ox.ac.uk/ian.horrocks/

Fariz Darari @ http://ir.cs.ui.ac.id/