Semantic Social Web
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Transcript of Semantic Social Web
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Dr. Sabin BuragaFaculty of Computer Science
“Alexandru Ioan Cuza” University of Iasi, Romania
www.purl.org/net/busaco
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Computer Science
arts
Web interaction
design
painting
professor
music
semantic
literature
A. I. CuzaUniversity
photography
programming
conferences
booksteaching
RomaniaXML
@busaco
research
passion
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server
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serverclient
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serverclient
server
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serverclient
server
client
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client
serverclient
server
client server
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Web server
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Web server Web client(s)
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HTTP as protocol
Web server Web client(s)
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URI to address resources
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HTML as markup language structure
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CSS for styling presentation
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anything can link to anything
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Web as a platform facilitating participation
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social software
(micro)blogs, social networks, wikis,…
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tagging
social software
(micro)blogs, social networks, wikis,…
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from collaboration to trust (?!)
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RIA – rich interaction between users and applications
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mash-ups
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new (e)business models
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some questions…
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how about reusing data in other contexts?
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reality: walled “gardens” (mansions)
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how about explaining data?
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in fact, we really want to annotate data by hand?
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how about enriching data?
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reality: the need of “intelligent” software
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how about maturity: from data to knowledge?
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pragmatism: there are costs, lack of expertise, etc.
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pragmatism: there are costs, lack of expertise, etc.
laziness & resistance to change?
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let’s add some semantic spices to old HTML juice
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first simplest solution: microformats
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<div class="vcard"><h3>Personal details</h3>
<img src="sabin-buraga-busaco-csb35.jpg" alt="Photo of Sabin-Corneliu Buraga" class="photo" />
<p>Full name: <span class="fn"><span class="given-name">Sabin-Corneliu</span> <span class="family-name">Buraga</span></span></p>
<p><span class="vevent"><span class="summary">Date of birth</span>: <abbr class="dtstart" title="19740107">January 07, 1974</abbr></span></p>
</div>
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<div class="vcard"><h3>Personal details</h3>
<img src="sabin-buraga-busaco-csb35.jpg" alt="Photo of Sabin-Corneliu Buraga" class="photo" />
<p>Full name: <span class="fn"><span class="given-name">Sabin-Corneliu</span> <span class="family-name">Buraga</span></span></p>
<p><span class="vevent"><span class="summary">Date of birth</span>: <abbr class="dtstart" title="19740107">January 07, 1974</abbr></span></p>
</div>
hCard microformat
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Operator extension for Firefox in action
hCard + hEvent
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asserting social relations via XFN microformat
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result: metadata embedded into Web documents
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we need a more flexible approach!?
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creating/using specific vocabularies in a standard way
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RDF – Resource Description Framework
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“The Wall is an album made by Pink Floyd.”
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TheWall isA Album . TheWall madeBy Pink Floyd .
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TheWall isA Album .
subject predicate object
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TheWall isA Album .
subject predicate object
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TheWall isA Album .
subject predicate object
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TheWall isA Album .
subject predicate object
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TheWall isA Album .
subject predicate object
URI URI URI
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TheWall dc:title "The Wall"@en .
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TheWall dc:title "The Wall"@en .
Dublin Core (DCMI) vocabulary
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PinkFloyd foaf:made TheWall .
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PinkFloyd foaf:made TheWall .
FOAF (Friend Of A Friend)
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PinkFloyd rdf:type mo:MusicGroup .
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PinkFloyd rdf:type mo:MusicGroup .
any vocabulary you like… ☺
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using multiple (standardized) vocabulariesweb of data
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Anca
Laurian
knowsrelation
owns
firstnameproperty
pig
photo
www.flickr.com/laurian
tagged
Person class
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so, we can publish and reuse public RDF data
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linked data
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anyone can say anything about any topic
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RDF constructs can be used directly into Web pagesRDFa
interesting initiatives: Common Tag, Good Relations
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other well known vocabularies:DOAP – Description Of A Project
SIOC – Semantically-Interlinked Online Communities
vocab.org
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how about specifying concepts, their properties, relations between concepts, restrictions,…?
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modeling knowledge via ontologies
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OWL –Web Ontology Language
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classes
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Equinoxe a Album
rdf:type
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JeanMichelJarre a foaf:PersonRogerWaters a foaf:Person
RogerWaters a db:MusicalArtistTheWall a db:Album
foaf:Person a owl:Classdb:City a owl:Class
mo:MusicGroup a owl:Class
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JeanMichelJarre a foaf:PersonRogerWaters a foaf:Person
RogerWaters a db:MusicalArtistTheWall a db:Album
foaf:Person a owl:Classdb:City a owl:Class
mo:MusicGroup a owl:Class
a class from DBpedia ontology
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JeanMichelJarre a foaf:PersonRogerWaters a foaf:Person
RogerWaters a db:MusicalArtistTheWall a db:Album
foaf:Person a owl:Classdb:City a owl:Class
mo:MusicGroup a owl:Class
defining different classes via OWL
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relations
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Vangelis foaf:made Direct
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Vangelis foaf:knows JonAnderson
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related specifications:RDF Schema
SKOS – Simple Knowledge Organizational System
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how about querying such webs of data?
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queries about individuals via SPARQL
SELECT ?title WHERE {?group a mo:MusicGroup ;
foaf:name "Pink Floyd";foaf:made ?album .
?album dc:title ?title .}ORDER BY ?title LIMIT 3
access to BBC Music
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using SPARQL in tools – for example, Zemanta
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db:MusicalArtist rdfs:subClassOf foaf:Person .plays a owl:ObjectProperty ;
rdfs:domain db:MusicalArtist ;rdfs:range mo:Song .
RogerWaters plays If .
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db:MusicalArtist rdfs:subClassOf foaf:Person .plays a owl:ObjectProperty ;
rdfs:domain db:MusicalArtist ;rdfs:range mo:Song .
RogerWaters plays If .
must be a song!
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db:MusicalArtist rdfs:subClassOf foaf:Person .plays a owl:ObjectProperty ;
rdfs:domain db:MusicalArtist ;rdfs:range mo:Song .
RogerWaters plays If .
must be an artist
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db:MusicalArtist rdfs:subClassOf foaf:Person .plays a owl:ObjectProperty ;
rdfs:domain db:MusicalArtist ;rdfs:range mo:Song .
RogerWaters plays If .
and a person, too
must be an artist
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query regarding knowledge (e.g., classes) inference
db:MusicalArtist rdfs:subClassOf foaf:Person .plays a owl:ObjectProperty ;
rdfs:domain db:MusicalArtist ;rdfs:range mo:Song .
RogerWaters plays If .
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www.mkbergman.com/new-version-sweet-tools-sem-web/
more things to come…
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thank you!
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Dr. Sabin Buragawww.purl.org/net/busaco
twitter.com/busaco