semantic web: intro
TRANSCRIPT
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Semantic Web: Intro
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PastSemantic Brain
Fariz Darari @ http://ir.cs.ui.ac.id/
contain
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NowSemantic Web
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contain
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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
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Why?
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What computers see
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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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<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/" />
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@ 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/