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Semantic Web: Intro
PastSemantic Brain
Fariz Darari @ http://ir.cs.ui.ac.id/
contain
NowSemantic Web
Fariz Darari @ http://ir.cs.ui.ac.id/
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
Fariz Darari @ http://ir.cs.ui.ac.id/
Why?
Fariz Darari @ http://ir.cs.ui.ac.id/
What we see
Why?
Fariz Darari @ http://ir.cs.ui.ac.id/
What computers see
Web Evolution
Fariz Darari @ http://ir.cs.ui.ac.id/
SW Principles
• URI• Ontology/Shared Vocabulary• Linked Open Data
Fariz Darari @ http://ir.cs.ui.ac.id/
Five-star Rating Scheme
Fariz Darari @ http://ir.cs.ui.ac.id/
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
Fariz Darari @ http://ir.cs.ui.ac.id/
OWL
• Web knowledge representation language• More semantics, extends the expressivity– owl:equivalentClass– owl:equivalentProperty– owl:inverseFunctionalProperty– owl:inverseOf
Fariz Darari @ http://ir.cs.ui.ac.id/
Description Logic
• Logical formalism for OWL
Fariz Darari @ http://ir.cs.ui.ac.id/
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”
Fariz Darari @ http://ir.cs.ui.ac.id/
Open World Reasoning
If something is unknown, unknown
instead of
If something is unknown, false
Fariz Darari @ http://ir.cs.ui.ac.id/
Internet of Things
Fariz Darari @ http://ir.cs.ui.ac.id/
Use Casedata.gov
• Dataset repository and mashup• http://www.data.gov/
Fariz Darari @ http://ir.cs.ui.ac.id/
Use CaseDBPedia
• Text annotation based on Wikipedia knowledge
• http://dbpedia.org/spotlight
Fariz Darari @ http://ir.cs.ui.ac.id/
Use CaseGoogle Recipe
• Faceted search• http://google.com/landing/recipes
Fariz Darari @ http://ir.cs.ui.ac.id/
Use CaseFacebook OGP
• Light-weight version of Semantic Web• Implemented using RDFa• Integrate web pages into the social graph
Fariz Darari @ http://ir.cs.ui.ac.id/
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
Fariz Darari @ http://ir.cs.ui.ac.id/
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/