Keith Alexander (Talis), Richard Cyganiak (DERI), Michael...
Transcript of Keith Alexander (Talis), Richard Cyganiak (DERI), Michael...
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DescribingLinkedDatasetsOntheDesignandUsageofvoiD,
the‘VocabularyOfInterlinkedDatasets’LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain
KeithAlexander(Talis),RichardCyganiak(DERI),MichaelHausenblas(DERI)andJunZhao(UniversityofOxford)
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 2
Agenda
• TheProblem• OurProposal–voiD• ApplicaNons• NextSteps
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 3
TheProblem
2008
2007
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 4
TheProblem
2009
2008
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 5
TheProblem
• TheLinkingOpenData(LOD)cloudgatherscurrentlyroughlythesamemomentumastheWebintheearly1990s
• Howdidpeopledealwiththeconsequencesofhavingadecentralizedsystem,backthen?
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 6
TheProblem
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 7
TheProblem
• From2007on,wehavebeendoingitintheYahoo!‐catalog‐style:manuallycollec>ngandrepresen>ngdataabouttheLinkingOpenDatacloud:– IntheLODclouddiagram,wegiveaqualitaNveviewinformofavisualgraph
– InvariousESWWikipageswecreateHTMLtables:• h`p://esw.w3.org/topic/TaskForces/CommunityProjects/LinkingOpenData/DataSets/StaNsNcs
• h`p://esw.w3.org/topic/TaskForces/CommunityProjects/LinkingOpenData/DataSets/LinkStaNsNcs
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 8
TheProblem
h`p://esw.w3.org/topic/TaskForces/CommunityProjects/LinkingOpenData/DataSets/StaNsNcs
h`p://esw.w3.org/topic/TaskForces/CommunityProjects/LinkingOpenData/DataSets/LinkStaNsNcs
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 9
TheProblem
• Currently,onlyhumancomprehensibledescrip>ons(theLODcloud,Wikipages)available
• Wecan’tautomatetasks,suchas– Efficient&effecNvesearch
– SelecNonofdataset(forapps,interlinkingtargets)– GeneraNonofmaps,etc.
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 10
TheProblem
• Wecan’tapplyourtoolsandmethodswehaveexperienceswith,suchaseditors,engines,stores,etc.
• Evenworse,itdoesn’tscale– We’dneedaGoogle‐styleapproachthatscaleslikehellandispowerfulenoughtoenabletheabovemenNoned
– ProvidingmetadataabouttheLODcloudinamachine‐comprehensibleway
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 11
Agenda
TheProblem• OurProposal–voiD• ApplicaNons• NextSteps
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 12
OurProposal‐voiD
• SoluNon:providingaformaldescripNonof– Whatadatasetisabout(topic,technicaldetails)
– HowandunderwhichcondiNonstoaccessit– Howthedatasetisinterlinkedwithotherdatasets• QualitaNvelevel:typeofinterlinking• QuanNtaNvelevel:numberoflinks,resources,etc.
– Howtodiscoverthemetadata
• voiD,the“VocabularyofInterlinkedDatasets”providespreciselythis
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 13
OurProposal‐voiD
• AdatasetisasetofRDFtriplesthatarepublished,maintainedoraggregatedbyasingleprovider.
• Adatasetisauthorita>vewithrespecttoacertainURInamespaceifitcontainsinformaNonaboutresourcesnamedbyURIsinthisnamespace,andispublishedbytheURIowner(URIownershipasoftheAWWW1)
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 14
OurProposal‐voiD
• AlinksetLSisasetofRDFtripleswhereforalltriplesti=⟨si,pi,oi⟩∈LS,thesubjectisinonedataset,i.e.allsiaredescribedinDS1,andtheobjectisinanotherdataset,i.e.alloiaredescribedinDS2.
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OurProposal‐voiD
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 16
OurProposal‐voiD
voiDofferstwoorthogonalinterlinkingtypes:• classicLODvs.3rd‐party,differinginwheretheinterlinkingstatementsare
kept.Inthefirstcasetheinterlinkingtriples,i.e.alinkset,arehostedinoneofthetwoinvolveddatasets,whileinthela`ercasethereisathirddatasetinvolvedthatcontainstheinterlinkingtriples,i.e.thelinkset;
• non‐directedvs.directed,whichaddressestheissueifsomeoneisinterestedinstaNngthedirecNonoftheinterlinkingornot(forexamplewithowl:sameAs)
classicLOD,non‐directed
3rd‐party,non‐directed
classicLOD,directed
3rd‐party,directed
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 17
OurProposal‐voiD
classicLOD,non‐directed
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 18
classicLOD,directed
OurProposal‐voiD
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 19
3rd‐party,non‐directed
OurProposal‐voiD
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 20
3rd‐party,directed
OurProposal‐voiD
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OurProposal‐voiD
• Reusingtermsfromothervocabularies– foaf:homepage/IFP
– dcterms:subjectalongwithDBpediaURIsh`p://dbpedia.org/resource/XXX
– SCOVOforstaNsNcsabouttriples,links,etc
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 22
OurProposal‐voiD
• PublicaNon&discoveryviasitemapsand/orbacklinks(dcterms:isPartOf)
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 23
OurProposal‐voiD
• OncedatasetprovidershavepublishedtheirvoiDdescripNoninRDFalongwiththeirdataset,onecanaddressthefollowingissues:– Howtofindsomedatasets?
– Howtoefficientlyfindaspecificdataset?– Howtoeffec>velyfinddatasets?– Howtodynamicallyselectdatasets?– Howtoselectdatasetsbasedoncertainpreferences?
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Agenda
TheProblem OurProposal–voiD• ApplicaNons• NextSteps
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 25
Applica>ons
• GeneraNon(ve,lipSSM,NXparser)• VocabularyManagement(Talis)
• Explorer(RKB,LDE)• QueryFederaNon(Clarck‐Parsia,OpenLink)• Datasetranking(DING!talk)
• PotenNalApplicaNons– Mapofdata(Sindice)– DynamicMeshupsforApplicaNon
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 26
Applica>ons
h`p://ld2sd.deri.org/ve
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 27
Applica>ons
h`p://ld2sd.deri.org/lde
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Applica>ons
h`p://db
lp.rkbexplorer.com
/mod
els/void.`l
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 29
Applica>ons
h`p://linkeddata.uriburner.com/
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Agenda
TheProblem OurProposal–voiD ApplicaNons• NextSteps
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DescribingLinkedDatasets–OntheDesignandUsageofvoiD,the“VocabularyOfInterlinkedDatasets”,LinkedDataWorkshopatWWW09,2009‐04‐20,Madrid,Spain 31
NextSteps
• voiD2.0seeissuesath`p://code.google.com/p/void‐impl/issues/list
• staNsNcsmodule(fix/extendreSCOVO)
• SPARQLendpoints• provenance,trust(?)• AssistpeopleinpublishingvoiD