Download - OpenHPI 1.6 - The Vision of the Semantic Web - Part 2

Dr. Harald Sack

Hasso Plattner Institute for IT Systems Engineering

University of Potsdam

Spring 2013

Semantic Web Technologies

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Lecture 1: The Web of Data 06: The Vision of the Semantic Web Part 2

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Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam

Lecture 1: The Web of Data

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Open HPI - Course: Semantic Web Technologies


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06: The Vision of the Semantic Web Pt.2 OpenHPI - Course Semantic Web Technologies - Lecture 1: The Web of Data


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Das Semantic Web

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Semantic Web ...towards an „intelligent“ Web


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Fabio Capello http://dbpedia.org/resource/Fabio_Capello

URI - Uniform Resource Identifier


http://dbpedia.org/page/Fabio_Capello



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http://dbpedia.org/resource/Fabio_Capello

http://de.wikipediapedia.org/wiki/Fabio Capello




http://de.wikipediapedia.org/wiki/Lukas_Podolski

http://de.wikipediapedia.org/wiki/Lukas_Podolski


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RDF Resource Description Framework

:Fabio_Capello dbpp:birthPlace :San_Canzian .:Fabio_Capello dbpp:birthDate “1946-06-18“ .:Fabio_Capello rdfs:type dbpo:SoccerManager .:Fabio_Capello rdfs:type dbpo:Person ....

:Fabio_Capello rdf:type dbpo:SoccerManager .

RDF Tripel RDF Subject RDF Property RDF Object





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http://dbpedia.org/ontology/SoccerManager

dbpo:SoccerManager rdf:type owl:class .dbpo:SoccerManager rdfs:subClassOf dbpo:Person .dbpo:SoccerManager rdfs:label “SoccerManager“ .dbpp:birthPlace rdf:type rdf:Property .dbpp:birthPlace rdfs:domain dbpo:Person .dbpp:birthPlace rdfs:range dbpo:Place .dbpp:birthDate rdf:type rdf:Property .dbpp:birthDate rdfs:domain :Person .dbpp:birthDate rdfs:range xsd:date ....

RDF Schema

Person PlacebirthPlace

DatebirthDate

SoccerManager

is subclass of





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Fabio Capello

LivingPeople

PersonDate

birthDate1946-06-18

birthDate

is a

is a

is subclass of

DeadPeople∩ =∅

logical constraintis subclass of

(Description Logics) + Rules

∀x.∃y.hasDeathDate(x,y) ∧ Person(x) ∧ Date(y) ! DeadPeople(x)

entities

classes



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PREFIX dbpo: <http://dbpedia.org/ontology/>PREFIX dbpp: <http://dbpedia.org/property/>

SELECT DISTINCT ?l ?l2 ?g FROM <http://dbpedia.org> WHERE { ?s rdf:type dbpo:SoccerPlayer . ?s dbpp:nationalteam ?o . ?s rdfs:label?l FILTER langMatches( lang(?l), "EN" ) . ?s dbpp:nationalgoals ?g FILTER(?g>10). ?s dbpp:nationalteam ?nat . ?nat rdfs:label ?l2 FILTER langMatches( lang(?l2), "EN" ) .} ORDER BY DESC(?g)

Look for all Soccer Playersthat have scored more than 10 goals as member of anational team.


http://dbpedia.org

http://dbpedia.org

http://dbpedia.org

http://dbpedia.org

http://dbpedia.org

http://dbpedia.org

http://dbpedia.org/property/nationalteam

http://dbpedia.org/property/nationalteam


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Look for all Soccer Players that have scored more than 10 goals as member of a national team.


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Problem: Data Quality....

Look for all Soccer Players that have scored more than 10 goals as member of a national team.


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07: Applications in the Web of Data OpenHPI - Course Semantic Web Technologies - Lecture 1: The Web of Data

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