1. Linked Open DataLinked Open Data
HorváthHorváth ÁdámÁdám
Museum of Fine Arts, BudapestMuseum of Fine Arts, Budapest
MUZEUM@DIGITMUZEUM@DIGIT
Múzeumi Digitalizálási KonferenciaMúzeumi Digitalizálási Konferencia
Budapest, 2013. június 10–11.Budapest, 2013. június 10–11.

2. TerminologyTerminology
Linked Open Data (LOD)Linked Open Data (LOD)
Semantic webSemantic web (semweb)(semweb)
Open Linked DataOpen Linked Data
TThe web of Linked Open Datahe web of Linked Open Data
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

3. ContentContentss
Semantic web basicsSemantic web basics
Web and semantic webWeb and semantic web
Advantages of linked dataAdvantages of linked data
Cultural institutions on the semantic webCultural institutions on the semantic web
Semantic data examplesSemantic data examples
Semantic searchSemantic search
How to publish your dataHow to publish your data
Museum of Fine Arts and the semwebMuseum of Fine Arts and the semweb

4. Semantic web basicsSemantic web basics
SSet of linked RDF statementset of linked RDF statements
RDFRDF
– Resource Description FrameworkResource Description Framework
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

5. Semantic web basicsSemantic web basics
RDF statementRDF statement
– Abstract exampleAbstract example
• DeDeccameron’sameron’s author isauthor is BoccaccioBoccaccio
• SubjectSubject PredicatePredicate ObjectObject
Rules of RDF statementRules of RDF statement
– Subject, predicate must be URISubject, predicate must be URI
– Object can be URI or literalObject can be URI or literal
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

6. Semantic web basicsSemantic web basics
Concrete example (RDF/XML)Concrete example (RDF/XML)
– SubjectSubject
• <bibo:Document<bibo:Document
rdf:about="rdf:about="http://nektar.oszk.hu/resource/manifhttp://nektar.oszk.hu/resource/manif
estation/3078548estation/3078548">">
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

7. Semantic web basicsSemantic web basics
Concrete example (RDF/XML)Concrete example (RDF/XML)
– PredicatePredicate
• http://purl.org/dc/terms/creatorhttp://purl.org/dc/terms/creator
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

8. Semantic web basicsSemantic web basics
Concrete example (RDF/XML)Concrete example (RDF/XML)
– ObjectObject
• http://nektar.oszk.hu/resource/auth/122083http://nektar.oszk.hu/resource/auth/122083
– This URI identifies BoccaccioThis URI identifies Boccaccio
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

9. Semantic web basicsSemantic web basics
Concrete example (RDF/XML)Concrete example (RDF/XML)
– Subject, predicate, objectSubject, predicate, object ((fullfull URI)URI)
<bibo:Document<bibo:Document
rdf:about="rdf:about="http://nektar.oszk.hu/resource/manifeshttp://nektar.oszk.hu/resource/manifes
tation/3078548tation/3078548">">
<<http://purl.org/dc/termshttp://purl.org/dc/terms/creatorcreator
rdf:resource="rdf:resource="http://nektar.oszk.hu/resource/auth/http://nektar.oszk.hu/resource/auth/
122083122083""/>/>
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

10. Semantic web basicsSemantic web basics
Concrete example (RDF/XML)Concrete example (RDF/XML)
– Subject, predicate, object (abbreviated URI)Subject, predicate, object (abbreviated URI)
• http://purl.org/dc/termshttp://purl.org/dc/terms/creatorcreator -> dcterms:creator-> dcterms:creator
<bibo:Document<bibo:Document
rdf:about="rdf:about="http://nektar.oszk.hu/resource/http://nektar.oszk.hu/resource/
manifestation/3078548manifestation/3078548">">
<dcterms:creator<dcterms:creator
rdf:resource="rdf:resource="http://nektar.oszk.hu/resourchttp://nektar.oszk.hu/resourc
e/auth/122083e/auth/122083""/>/>
<<dc:creatordc:creator>>Boccaccio, Giovanni (1313-Boccaccio, Giovanni (1313-
1375)</dc:creator1375)</dc:creator>>
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

11. Semantic web basicsSemantic web basics
Predicates of the previous pagesPredicates of the previous pages
– bibo:Documentbibo:Document
– dcterms:creatordcterms:creator
– dc:creatordc:creator
Prefixes represent element setsPrefixes represent element sets
– CRMCRM
Strings after the colon are theStrings after the colon are the
properties of the element setproperties of the element set
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

12. Semantic web basicsSemantic web basics
Statements can be linked togetherStatements can be linked together
easilyeasily
– The object of a statement can be theThe object of a statement can be the
subject of anothersubject of another
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

13. Web and the semantic webWeb and the semantic web
The web links pagesThe web links pages
The semantic web links dataThe semantic web links data
The web is similar to a documentThe web is similar to a document
The semantic web is similar to a databaseThe semantic web is similar to a database
– RDF is the format of the databaseRDF is the format of the database
– This database is independent from any applicationThis database is independent from any application
The web was created for humansThe web was created for humans
The semantic web was created for machinesThe semantic web was created for machines
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

14. AdvantageAdvantagess of linked dataof linked data
The linked data can provide a uniformThe linked data can provide a uniform
access mechanismaccess mechanism
– The linked data can be considered as aThe linked data can be considered as a
worldwide APIworldwide API
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

15. Advantages of linked dataAdvantages of linked data
technologytechnology
There are problems that can be solvedThere are problems that can be solved
more easily with using semantic webmore easily with using semantic web
technologytechnology
– National Széchényi Library uses triplestoreNational Széchényi Library uses triplestore
and SPARQL to retrieve all editions of aand SPARQL to retrieve all editions of a
certain workcertain work
– Oracle uses PROV to track changes overOracle uses PROV to track changes over
time for metadata from heterogeneoustime for metadata from heterogeneous
systemssystems
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

16. Semantic web and the culturalSemantic web and the cultural
institutionsinstitutions
The data of cultural institutions can beThe data of cultural institutions can be
shared by the means of a generallyshared by the means of a generally
used toolused tool
The cultural data can have a newThe cultural data can have a new
meaning in this environmentmeaning in this environment
The data of cultural institutions can beThe data of cultural institutions can be
transferred into RDF statementstransferred into RDF statements
relatively easyrelatively easy
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

17. The semweb and the culturalThe semweb and the cultural
institutionsinstitutions
The main role is to publish the dataThe main role is to publish the data
– Crating semantic web applications is theCrating semantic web applications is the
task of software developerstask of software developers
Cultural institutions can use semanticCultural institutions can use semantic
web technologiesweb technologies
Cultural institutions can use semanticCultural institutions can use semantic
web to enrich their own dataweb to enrich their own data
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

18. Libraries on the semantic webLibraries on the semantic web
The full library contentsThe full library contents
– LIBRIS (Union Catalogue of Sweden)LIBRIS (Union Catalogue of Sweden)
– National SzéchényiNational Széchényi LibraryLibrary
Bibliographical dataBibliographical data
– British LibraryBritish Library
– Deutsche National BibliothekDeutsche National Bibliothek
– Biblioteca Nacional de EspaBiblioteca Nacional de Españñaa
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

19. Museums on the semantic webMuseums on the semantic web
Yale Centre of British ArtYale Centre of British Art
– Full collectionFull collection
– Also supporter of open data (and pictures)Also supporter of open data (and pictures)
– TMS userTMS user
Smithsonian American Art MuseumSmithsonian American Art Museum
– Full collectionFull collection
– Links to Dbpedia, ULANLinks to Dbpedia, ULAN
– TMS userTMS user
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

20. Museums on the semantic webMuseums on the semantic web
MuseumFinlandMuseumFinland
Amsterdam MuseumAmsterdam Museum
LODAC Museum (Japan): 114 museumLODAC Museum (Japan): 114 museum
Italian MuseumsItalian Museums
– http://http://www.linkedopendata.it/datasets/museiwww.linkedopendata.it/datasets/musei
British MuseumBritish Museum
– Online CollectionOnline Collection
– http://collection.britishmuseum.org/http://collection.britishmuseum.org/
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

21. Europeana on the semantic webEuropeana on the semantic web
Europeana Data Model (EDM)Europeana Data Model (EDM)
– First implementation: Europeana Linked DataFirst implementation: Europeana Linked Data
PilotPilot
• data.europeana.eudata.europeana.eu
– Technical descriptionTechnical description
• http://http://pro.europeana.eupro.europeana.eu/web/guest/tech-details/web/guest/tech-details
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

22. Semantic data examplesSemantic data examples
Yale Centre of British ArtYale Centre of British Art
– Via a link on an HTML pageVia a link on an HTML page
– http://http://
collections.britishart.yale.edu/vufind/Record/36collections.britishart.yale.edu/vufind/Record/36
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

27. http://collection.britishart.yale.edu/id/object/8052

28. How to see semantic dataHow to see semantic data
Yale Centre of British ArtYale Centre of British Art
– Via a link on an HTML pageVia a link on an HTML page
• http://collections.britishart.yale.edu/vufind/Rechttp://collections.britishart.yale.edu/vufind/Rec
ord/3646000ord/3646000
– Via SPARQL endpointVia SPARQL endpoint
• http://collection.britishart.yale.edu/sparqlhttp://collection.britishart.yale.edu/sparql
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

31. Semantic web browsSemantic web browsersers
DiscoDisco
DotAcDotAc
EldaElda
MarblesMarbles
OpenLinkDataExplorerOpenLinkDataExplorer
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest
RippleRipple
SIOC BrowserSIOC Browser
Sig.maSig.ma
TabulatorTabulator
ZitgistZitgist
Source:Source:
http://http://www.w3.org/2001/sw/wiki/Category:Semantic_Web_Browserwww.w3.org/2001/sw/wiki/Category:Semantic_Web_Browser

32. Semantic web browersSemantic web browers
OpenLink Data ExplorerOpenLink Data Explorer
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

33. Semantic web browersSemantic web browers
OpenLink Data ExplorerOpenLink Data Explorer
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

34. Semantic web browersSemantic web browers
OpenLink Data ExplorerOpenLink Data Explorer
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

36. Semantic searchSemantic search
Europeanna ConnectEuropeanna Connect
– WP1 Creating the Europeana SemanticWP1 Creating the Europeana Semantic
LayerLayer
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

38. Semantic web applicatonsSemantic web applicatons

39. Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

40. Semantic SearchSemantic Search
works showing matching personworks showing matching person
works showing locationworks showing location
works showing conceptworks showing concept
works titledworks titled
works created fromworks created from
works with matching locationworks with matching location
works showing a more specific locationworks showing a more specific location
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

41. Semantic searchSemantic search
ResearchSpaceResearchSpace
– http://www.researchspace.org/online-http://www.researchspace.org/online-
researchresearch
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

42. Semantic searchSemantic search
ResearchSpaceResearchSpace
– https://www.youtube.com/watch?https://www.youtube.com/watch?
feature=player_embedded&v=HCnwgq6ebfeature=player_embedded&v=HCnwgq6eb
AsAs

43. Site based on linked dataSite based on linked data
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

44. How to publish your dataHow to publish your data
Convert your data into RDF statementsConvert your data into RDF statements
– EDM, CIDOC_CRMEDM, CIDOC_CRM
Create external linksCreate external links
Load the statements into a triplestoreLoad the statements into a triplestore
– Jena, Virtuoso, etc.Jena, Virtuoso, etc.
Advertise your dataset inAdvertise your dataset in
– http://datahub.io/http://datahub.io/
– Your homepageYour homepage
– In email listsIn email lists
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

45. Useful informationUseful information
Cool URIs for the Semantic WebCool URIs for the Semantic Web
– http://www.w3.org/TR/2008/NOTE-cooluris-http://www.w3.org/TR/2008/NOTE-cooluris-
20080331/20080331/
How to Publish Linked Data on the WebHow to Publish Linked Data on the Web
– http://www4.wiwiss.fu-http://www4.wiwiss.fu-
berlin.de/bizer/pub/LinkedDataTutorial/berlin.de/bizer/pub/LinkedDataTutorial/
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

46. Museum of Fine ArtsMuseum of Fine Arts and semweband semweb
The museum has already decided toThe museum has already decided to
take part in a project aiming to publishtake part in a project aiming to publish
the metatada on the semantic webthe metatada on the semantic web
Linked Open Data – Ádám Horváth - Museum of Fine Arts, Budapest

47. adam.horvathadam.horvath@@szepmuveszti.huszepmuveszti.hu
Thank you for your attentionThank you for your attention