Publishing Linked Data from relational databases

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1 Publishing Linked Data from relational databases Iván Ruiz Rube Departamento de Lenguajes y Sistemas Informáticos Universidad de Cádiz 09/11/2011 Jornadas de Software Libre y Web 2.0 1

2 Roadmap The evolution of the Web Linked Open Data Exposing databases with D2R Server Case study: The VOA3R Project Conclusions 09/11/2011 Jornadas de Software Libre y Web 2.0 2

3 PUBLISHING LINKED DATA FROM RELATIONAL DATABASES THE EVOLUTION OF THE WEB 09/11/2011 Jornadas de Software Libre y Web 2.0 3

4 World Wide Web Most important infrastructure for the distribution of information. Rich and broad information: text, images, videos, slides, etc. Web navigators support HTML, JS, CSS and other formats. Navigation based on hyperlinks. 09/11/2011 Jornadas de Software Libre y Web 2.0 4

5 Web based on documents 09/11/2011 Jornadas de Software Libre y Web 2.0 5

6 Web Evolution Web 1.0 Web 2.0 Web /11/2011 Jornadas de Software Libre y Web 2.0 6

7 Web 1.0 Beginnings of the Web Static pages Limited use of standards Lack of interaction with the user 09/11/2011 Jornadas de Software Libre y Web 2.0 7

8 Web 2.0 Higher bandwidth Standards Rich User Interface Accessibility Usability Social networks 09/11/2011 Jornadas de Software Libre y Web 2.0 8

9 Web 3.0 3D virtual environments The Internet of Things Domotics Cloud Computing Semantic Web 09/11/2011 Jornadas de Software Libre y Web 2.0 9

10 Semantic Web 1 Tim Berners-Lee I have a dream for the Web (in which computers) become capable of analyzing all the data on the Web. the day-to-day mechanisms of trade, bureaucracy and our daily lives will be handled by machines talking to machines. 09/11/2011 Jornadas de Software Libre y Web

11 PUBLISHING LINKED DATA FROM RELATIONAL DATABASES LINKED OPEN DATA 09/11/2011 Jornadas de Software Libre y Web

12 Information Age Huge amount of information A large number of information systems Big challenges: Data integration Data analysis 09/11/2011 Jornadas de Software Libre y Web

13 Need for open data Improvement of organizational transparency Public data Foster the research Promote the development of third-party system 09/11/2011 Jornadas de Software Libre y Web

14 Linked Open Data A method of publishing structured data so that it can be interlinked and become more useful. it extends web pages to share information in a way that can be read automatically by computers. 1 1 Tim Berners-Lee 09/11/2011 Jornadas de Software Libre y Web

15 Resource Description Format Paper /11/2011 Jornadas de Software Libre y Web

16 Resource Description Format Linked Data - The Story So Far title Paper12345 year /11/2011 Jornadas de Software Libre y Web

17 Resource Description Format Linked Data - The Story So Far JournalSWIS title publishedin Paper12345 year author Berners-Lee /11/2011 Jornadas de Software Libre y Web

18 Resource Description Format Linked Data - The Story So Far title publishedin JournalSWIS Paper12345 year author director Berners-Lee type Person 09/11/2011 Jornadas de Software Libre y Web

19 RDF (sintaxis) <http://publisher.org/papers/paper12345> title "Linked Data - The Story So Far"; year " "; author <http://w3.org/people/berners-lee>; publishedin <http://publisher.org/journal/journalswis>. <rdf:description rdf:about="http://publisher.org/papers/paper12345"> <title>linked Data - The Story So Far</title> <year> </year> <author rdf:resource="http://w3.org/people/berners-lee" /> <publishedin rdf:resource="http://publisher.org/journal/journalswis" /> </rdf:description> 09/11/2011 Jornadas de Software Libre y Web

20 Ontologies (vocabularies) An ontology is an explicit and formal specification of a shared conceptualization 1 1 Tom Gruber 09/11/2011 Jornadas de Software Libre y Web

21 Linked Data Cloud 09/11/2011 Jornadas de Software Libre y Web

22 PUBLISHING LINKED DATA FROM RELATIONAL DATABASES EXPOSING DATABASES WITH D2R SERVER 09/11/2011 Jornadas de Software Libre y Web

23 How is your data currently stored? 09/11/2011 Jornadas de Software Libre y Web

24 How to publish Linked Data? The Story So Far LinkedData 2008 JournalSemanticWeb W3C Berners-Lee Annotation Manual Collaborative (Semi-)automatic Exposure RDF Triple Store HTML+RDF (RDFa) RDF Wrappers SQL2RDF 09/11/2011 Jornadas de Software Libre y Web

25 Web Application Architecture User Interface Relational Database Application Server 09/11/2011 Jornadas de Software Libre y Web

26 Web Application Architecture using D2R Server Application Server Relational Database 09/11/2011 Jornadas de Software Libre y Web

27 Web Application Architecture using D2R Server Application Server Relational Database <http://cris.org:/resource/projects/organic> a cerif:project ; rdfs:label "Multilingual Federation of Learning ; cerif:acronym "Organic.Edunet" ; cerif:enddate " "^^xsd:date ; cerif:internalidentifier "ff cf99e01300d1a355f0003" cerif:islinkedbyorganisationunit D2R Server 09/11/2011 Jornadas de Software Libre y Web

28 Web Application Architecture using D2R Server Application Server Relational Database <http://cris.org:/resource/projects/organic> a cerif:project ; rdfs:label "Multilingual Federation of Learning ; cerif:acronym "Organic.Edunet" ; cerif:enddate " "^^xsd:date ; cerif:internalidentifier "ff cf99e01300d1a355f0003" cerif:islinkedbyorganisationunit D2R Server 09/11/2011 Jornadas de Software Libre y Web

29 Exposing and Consuming Linked Data Internet Navigator File Favourites Help URL: Relational Database D2R Server mashup 09/11/2011 Jornadas de Software Libre y Web

30 Installing D2R 09/11/2011 Jornadas de Software Libre y Web

31 Using D2R ~/d2rserver$> generate-mapping -o MAPPING.n3 -d com.mysql.jdbc.driver -u USER -p PASSWORD jdbc:mysql://localhost:3306/database ~/d2rserver$> d2r-server MAPPING.n3 09/11/2011 Jornadas de Software Libre y Web

32 Database model example 09/11/2011 Jornadas de Software Libre y Web

33 Vocabularies #Built-in rdf: rdfs: xsd: owl: <http://www.w3.org/2002/07/owl#>. #Specific foaf: dc: dcterms: bibo: geo: cerif: <http://eurocris.org/cerif#>. 09/11/2011 Jornadas de Software Libre y Web

34 Database Connection map:database a d2rq:database; # Main settings d2rq:jdbcdriver "com.mysql.jdbc.driver"; d2rq:jdbcdsn "jdbc:mysql://localhost:3306/database"; d2rq:username "USER"; d2rq:password "PASSWORD"; # Other settings jdbc:autoreconnect "true"; jdbc:zerodatetimebehavior "converttonull"; d2rq:allowdistinct "true"; jdbc:keepalive "3600"; # value in seconds jdbc:keepalivequery "SELECT 1";. 09/11/2011 Jornadas de Software Libre y Web

35 Exposing RDF Resources map:organisationunits a d2rq:classmap; d2rq:datastorage map:database; d2rq:class cerif:organization; d2rq:uripattern d2rq:condition "ORGANISATIONS.ACRONYM <> ''. UCA rdf:type Organization 09/11/2011 Jornadas de Software Libre y Web

36 Exposing literal properties map:organisationunits_headcount a d2rq:propertybridge; d2rq:belongstoclassmap map:organisationunits; d2rq:property cerif:headcount; d2rq:column "ORGANISATIONS.HEADCOUNT. UCA cerif:headcount /11/2011 Jornadas de Software Libre y Web

37 Exposing 1:N relations map:organisationunits_name a d2rq:propertybridge; d2rq:belongstoclassmap map:organisationunits; d2rq:property cerif:name; d2rq:join "ORG_NAME.ORGID = ORGANISATIONS.ID"; d2rq:column "ORG_NAME.NAME. UCA cerif:name cerif:name Universidad de University of 09/11/2011 Jornadas de Software Libre y Web

38 Exposing N:M relations map:organisationunits_person a d2rq:propertybridge; d2rq:belongstoclassmap map:organisationunits; d2rq:property cerif:members; d2rq:join "ORG_PERS.ORGID = ORGANISATIONS.ID"; d2rq:join "ORG_PERS.PERSID = PERSON.ID"; d2rq:referstoclassmap map:person. UCA cerif:members InvestigadorXYZ 09/11/2011 Jornadas de Software Libre y Web

39 PUBLISHING LINKED DATA FROM RELATIONAL DATABASES CASE STUDY: THE VOA3R PROJECT 09/11/2011 Jornadas de Software Libre y Web

40 Platform based on semantic technologies to integrate open contents for researchers. Manages scientific context: Organizations Research Projects Researcher Profiles etc. Publishes its data using D2R Server. 09/11/2011 Jornadas de Software Libre y Web

41 VOA3R Portal 09/11/2011 Jornadas de Software Libre y Web

42 Organization s Data in VOA3R 09/11/2011 Jornadas de Software Libre y Web

43 Organization s Data in RDF <http://voa3r.cc.uah.es/dataset/resource/organisationunits/uah> rdf:type cerif:organisationunit ; rdfs:label "University of Alcala" ; cerif:acronym "UAH" ; foaf:homepage <http://www.uah.es> ; cerif:researchactivities "Ontologies, Linked Data" ; dcterms:subject <http://aims.fao.org/aos/agrovoc/c_7273>, <http://aims.fao.org/aos/agrovoc/c_8070> ; 09/11/2011 Jornadas de Software Libre y Web

44 Organization s Data in RDF (II) cerif:researchprojects <http://voa3r.cc.uah.es/dataset/resource/projects/organic.edunet>, <http://voa3r.cc.uah.es/dataset/resource/projects/organic.lingua>, <http://voa3r.cc.uah.es/dataset/resource/projects/voa3r> ; cerif:innergroups <http://voa3r.cc.uah.es/dataset/resource/organisationunits/ieru> ; cerif:members <http://voa3r.cc.uah.es/dataset/resource/person/salvador_sanchez>, <http://voa3r.cc.uah.es/dataset/resource/person/miguel_refusta>, <http://voa3r.cc.uah.es/dataset/resource/person/luis_torrico>. 09/11/2011 Jornadas de Software Libre y Web

45 Organization s Data via D2R 09/11/2011 Jornadas de Software Libre y Web

46 SPARQL Client 09/11/2011 Jornadas de Software Libre y Web

47 PUBLISHING LINKED DATA FROM RELATIONAL DATABASES CONCLUSIONS 09/11/2011 Jornadas de Software Libre y Web

48 Conclusions Web based on documents Web based on Data. Linked Data as a way for interchanging data between different datasets in the Web. RDF as a standard format to describe data. D2R allows to publish RDF metadata from databases (non-intrusive technique). Main aim: Create new third-party applications using open linked data from LD systems. 09/11/2011 Jornadas de Software Libre y Web

49 References Linked Data: Evolving the Web into a Global Data Space W3C Linking Open Data Project ommunityprojects/linkingopendata D2R Server 09/11/2011 Jornadas de Software Libre y Web

50 Publishing Linked Data from relational databases thanks Iván Ruiz Rube 09/11/2011 Jornadas de Software Libre y Web

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