kwm clarke loh lod 20161115 - green chameleon · © 2016 synaptica, llc what is linked data agenda...
TRANSCRIPT
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Linked Data
Dave ClarkeSynaptica CEO
Gene LohSynaptica Software Architect
The World is Your Database
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WhatisLinkedData
Agenda
1. WhatisLinkedData,andwhyisitgoodforyou(15mins)
2. Howitworks(techtalk)(15mins)
3. Howyoucangetstarted(5mins)
4. DiscussionandQ&A(5-10mins)
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WhatisLinkedData
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What Makes Linked Data Special: 1 of 4
Before LinkedData:Informationwaslockedinsideproprietarydatabases,eachofwhichusedcustomdatabaseschemaandeverydatabaserecordwasaccessedbyidentifiersthatwere
onlyuniqueandintelligiblewithinthesystemwheretheyoriginated.
Theguardiansofthesedata‘fortresses’didn’tlikesharingdata.Ifithadtobedoneatallthendatawasextractedanddeliveredunderlockandkeywithcrypticinstructionsonhowtouseit.
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What Makes Linked Data Special: 2 of 4
AfterLinkedData:everyresource(concept,name,databaserecord,etc.)hasagloballyUniqueResourceIdentifier(URI)thatisintelligibletoanyoneelseontheplanet.
MeSH(MedicalSubjectHeadings):InternalMedicine
http://id.nlm.nih.gov/mesh/D007388
GettyArt&ArchitectureThesaurus:Renaissance
http://vocab.getty.edu/aat/300021140
LibraryofCongressNameAuthority:BarackObama
http://id.loc.gov/authorities/names/n94112934
GeoNames:London
http://www.geonames.org/2643743
EuropeanEnvironmentAgency:Inlandsurfacewaters
http://eunis.eea.europa.eu/habitats/58
WordNetLexicalDatabase:finance
http://wordnet-rdf.princeton.edu/wn31/101136358-n
WorldWideWeb Database
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What Makes Linked Data Special: 3 of 4
BeforeLinkedData:webhyperlinksweremeresignpoststootherwebpages.
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AfterLinkedData:linksbecomesemantic,theyexpressthespecificreason
whytwoentitiesarerelated.
Thesesemanticallyexpressivelinks,calledpredicates,assertfactualstatementsandsupportmachinereasoning.Theyalsohavetheirown
URIsidentifyingtheirplaceinontologicalschema.
foaf:Topic owl:sameAs prov:wasInfluencedBy
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Is Linked Data Always Open Data? If I create Linked Data is it automatically exposed to the public?
noopenisoptional
allLinkedDataiscapableofbeingshared
butLinkedDatacanalsoresidebehindthefirewall
LinkedEnterprise
Data
LinkedOpenData
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Whyitisgoodforyou1. Adoptingandre-usingLinked
OpenDatataxonomies2. SemanticEnrichment
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Example1:Adoptingandre-usingLinkedOpenDataTaxonomies
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Build Buy
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Build BuyNewmantrafortaxonomyprojects:
ADOPT first
ADAPT second
CREATE third
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Linked Open Data Taxonomy Sources
Jumpstartyourtaxonomyproject
Trustedauthorities
Manydifferentsubjectdomains
Millionsofconcepts
Manysourcesinthepublicdomain
Standardelectronicformat
Livequeryand/ordownload
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When Do Third Party Taxonomies Work Best
üû
Corporate&EnterpriseTaxonomies
STEMs:Science,Technology,Engineering&Mathematics
HCLS:HealthCare&LifeSciencesCulturalHeritageNewsMediaGeospatial
PersonNames
Products&ServicesCommodities
FinanceLegal&Regulatory
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Example 1: Linked Canvas
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Example 1: Getty AAT, IconClass & DBpedia Imported for Search / Browse
DBpedia• 1.3Mprimaryresources• 31Mrelationships&propertiesGettyAAT• 42Kprimaryresources• 14.7Mrelationships&propertiesIconClass• 40Kprimaryresources• 3.4Mrelationships&propertiesLCNAF• 9.5Mprimaryresources• 80Mrelationships&propertiesLCSH• 419Kprimaryresources• 3.9Mrelationships&properties
Totalinthissystem• 11.3Mprimaryresources• 133Mrelationships&properties
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Example 1: Getty AAT, IconClass & DBpedia Imported for Search / Browse
ProcessofindexingavisualdetailinsideapaintingtotheDBpediacategoryresourceforLutes
http://dbpedia.org/resource/Category:Lutes
viatheFOAFpredicateDepicts
foaf:depicts
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Example 1: Semantic Indexing Using Linked Open Data Taxonomies
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Example 1: Linked Open Data – a World Wide Database
Forimageattributionspleasevisitwww.linkedcanvas.org
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Example2:MappingtoLinkedOpenDataresourcesforSemanticEnrichment
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Example 2: Semantic Enrichment – Internal record has minimal data
UseCaseAninternaltaxonomyofpersonnamesstoresonlyminimalinformation:First
Name,LastNameandafieldforBiographicNotes
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Example 2: Semantic Enrichment – search for equivalent in external LOD source
ByclickingontheLinkedDatabuttonwecanautomaticallysearchforourpersonin
DBpediaoranyotherLinkedDatasourcesuchasVIAFor
LCNAF
Matchingresultsarereturnedandthechosen
entityselected
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Example 2: Semantic Enrichment – mapping and choosing properties
Amappingrelationshipconnectstheinternaltaxonomyrecordtothe
externalLinkedDataresource.InthisinstancetheOWLpredicatesameAs isused.
Lastlyselectionsfromanarrayofdescriptive
propertiescanbemade.
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Semantic Enrichment Benefits
1. Beforesemanticenrichmentwehadonlyournameandsomebriefbiographicnotes.
2. Aftersemanticenrichmentwehadtheseplusanauthoritativename,adetailedbiographicabstract,birthdate,birthplace.
3. Thenewdatacanbeseamlesslyblendedwithinternaldataforpresentationinscreens,reports andexportfiles.
4. URIlinksarestoredinthebackgroundtoprovideauthoritativeprovenanceinformationonwherethisdatacamefromandwhen.
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Howitworks(techtalk)
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Semantic Web,RDF, Triples, URIs, SPARQL
Fundamental Concepts
HowisLinkedDatadifferentfromotherdataandtraditional
relationaldatabases?
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name: Charles Babbage name: Ada
Lovelaceinfluenced
Subject Predicate Object
<http://id.loc.gov/authorities/names/n50031102> prov:influenced <http://id.loc.gov/authorities/names/n78030997>
<http://id.loc.gov/authorities/names/n50031102> foaf:name ”Charles Babbage"
<http://id.loc.gov/authorities/names/n78030997> foaf:name “Ada Lovelace”
RDF Triples
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A B C D
X Y
L
M N O
P Q
R
know
nFor
know
nFor
influenced influenced influenced
coun
tryO
fB
irth
Science
MathsComputerScience
Astronomy
Astrophysics
CharlesBabbage
BlaisePascal
AdaLovelace
MarySomerville
France UnitedKingdom
PhysicalSciences
Physics
NT
Graph Model
LC Name Authority File
LC Subject Headings
GeoNames
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ComputationalTime
Size ofDataset
Graph Database
Relational Database
Pattern Matching and Nested Queries with Triplestores
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RDF-XMLJSON-LDN-TriplesN-QuadsTurtleTriGN3
RDF Formats
Whyusetriplestoresinsteadofothertypesofgraphdatabase?
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Linked Open Data Vocabularies
1. http://www.getty.edu/research/tools/vocabularies/lod/index.html2. http://www.iconclass.org/help/lod3. http://www.geonames.org/ontology/documentation.html4. http://id.loc.gov/
LODsourcescanbeavailablefordownloadorforlivequery… whichmethod
ofaccessisbest?
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curl –H Content-type:text/turtle –upload-file ./authoritiesnames.nthttp://localhost:1234/repositories/linkedcanvas?graph=graphName
curl –X GET –H Accept:application/x-trighttp://localhost:1234/repositories/linkedcanvas
Importing and Exporting Linked Data Vocabularies
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Describing a Primary Resource in Linked Data
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1.http://vocab.getty.edu/queries#Full_Text_Search_Query
Free-Text Search using SPARQL
Graphdatabasesaren’tsupposetoworkthatwellwithfreetextsearch… howcanthis
beovercome?
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Free-Text Search in Linked Canvas
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GraphStoreHTTP
SPARQLendpoint
StaticfilesinRDFformats
Publishing Linked Open Data
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Howtogetstarted
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https://www.blazegraph.com/http://graphdb.ontotext.com/
Option 1: Get an Open Source Triple Storeand Some Good Reads
Ruth,Wood&ZaidmanManning(pub.)
Heath&BizerMorgan&Claypool(pub.)
Allemang &HendlerMorganKlaufman (pub.)
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Option 2: Adopt, Adapt and Create Linked Dataas part of your Taxonomy Management
Jumpstartyourtaxonomyproject
Trustedauthorities
Manydifferentsubjectdomains
Millionsofconcepts
Manysourcesinthepublicdomain
Standardelectronicformat
Livequeryand/ordownload
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Adopt any external ontology
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Start minting HTTP-URI’s for everything you create
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LinkedData
1. Awaytojump-starttaxonomyprojectsandreducecosts
2. Awaytotapintoexternalknowledgethatcanhelpansweryourbusinessquestions
3. Apowerfultoolforperformingcomplexsearchesandbuildingsmartapplications
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Linked DataThe World is Your Database
Dave ClarkeSynaptica CEO
Gene LohSynaptica Software Architect
Thank you!
Visit us at Booth 201