Semantic Social Web

Dr. Sabin BuragaFaculty of Computer Science

“Alexandru Ioan Cuza” University of Iasi, Romania

www.purl.org/net/busaco

Computer Science

arts

Web interaction

design

painting

professor

music

semantic

literature

A. I. CuzaUniversity

photography

programming

conferences

booksteaching

RomaniaXML

@busaco

research

passion

server

serverclient

serverclient

server

serverclient

server

client

client

serverclient

server

client server

Web server

Web server Web client(s)

HTTP as protocol

Web server Web client(s)

URI to address resources

HTML as markup language structure

CSS for styling presentation

anything can link to anything

Web as a platform facilitating participation

social software

(micro)blogs, social networks, wikis,…

tagging

social software

(micro)blogs, social networks, wikis,…

from collaboration to trust (?!)

RIA – rich interaction between users and applications

mash-ups

new (e)business models

some questions…

how about reusing data in other contexts?

reality: walled “gardens” (mansions)

how about explaining data?

in fact, we really want to annotate data by hand?

how about enriching data?

reality: the need of “intelligent” software

how about maturity: from data to knowledge?

pragmatism: there are costs, lack of expertise, etc.

pragmatism: there are costs, lack of expertise, etc.

laziness & resistance to change?

let’s add some semantic spices to old HTML juice

first simplest solution: microformats

<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>

<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

Operator extension for Firefox in action

hCard + hEvent

asserting social relations via XFN microformat

result: metadata embedded into Web documents

we need a more flexible approach!?

creating/using specific vocabularies in a standard way

RDF – Resource Description Framework

“The Wall is an album made by Pink Floyd.”

TheWall isA Album . TheWall madeBy Pink Floyd .

TheWall isA Album .

subject predicate object

TheWall isA Album .

subject predicate object

TheWall isA Album .

subject predicate object

TheWall isA Album .

subject predicate object

TheWall isA Album .

subject predicate object

URI URI URI

TheWall dc:title "The Wall"@en .

TheWall dc:title "The Wall"@en .

Dublin Core (DCMI) vocabulary

PinkFloyd foaf:made TheWall .

PinkFloyd foaf:made TheWall .

FOAF (Friend Of A Friend)

PinkFloyd rdf:type mo:MusicGroup .

PinkFloyd rdf:type mo:MusicGroup .

any vocabulary you like… ☺

using multiple (standardized) vocabulariesweb of data

Anca

Laurian

knowsrelation

owns

firstnameproperty

pig

photo

www.flickr.com/laurian

tagged

Person class

so, we can publish and reuse public RDF data

linked data

anyone can say anything about any topic

RDF constructs can be used directly into Web pagesRDFa

interesting initiatives: Common Tag, Good Relations

other well known vocabularies:DOAP – Description Of A Project

SIOC – Semantically-Interlinked Online Communities

vocab.org

how about specifying concepts, their properties, relations between concepts, restrictions,…?

modeling knowledge via ontologies

OWL –Web Ontology Language

classes

Equinoxe a Album

rdf:type

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

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

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

relations

Vangelis foaf:made Direct

Vangelis foaf:knows JonAnderson

related specifications:RDF Schema

SKOS – Simple Knowledge Organizational System

how about querying such webs of data?

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

using SPARQL in tools – for example, Zemanta

db:MusicalArtist rdfs:subClassOf foaf:Person .plays a owl:ObjectProperty ;

rdfs:domain db:MusicalArtist ;rdfs:range mo:Song .

RogerWaters plays If .

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!

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

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

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 .

www.mkbergman.com/new-version-sweet-tools-sem-web/

more things to come…

thank you!

Dr. Sabin Buragawww.purl.org/net/busaco

twitter.com/busaco