RDFformodellingOxfordUniversity

OxPointstheoldSystem

2RDFformodellingOxfordUniversity12/15/2008ArnoMiAelbach

AtypicalOxPointsrecord<placetype="college"xml:id="blac"><placeName>Blackfriars</placeName><eventwhen="1221"type="officialstatus"><label>FoundaQon</label></event><eventwhen="1921"type="officialstatus"><label>refounded</label></event><placesubtype="primary"type="building"><placeName>Lodge</placeName><locaQonwhen="2007‐05‐22T11:50:22.34+01:00"><georend="90">‐1.260370016098022551.756916532903084</geo><note>recordedbyJanetMcKnight</note></locaQon></place></place>

IndirectrelaQonshipwithparentelement

3RDFformodellingOxfordUniversity12/15/2008ArnoMiAelbach

ThenewOxPoints:Requirements

•  WewanttogetinformaQonabout–  colleges,units,departments,etc.–  buildings,rooms,etc.–  relaQons:ownership,usage,ect.–  events:foundaQon,etc.– manyotherthings

•  Wewanttobeableto– Drawmaps– Drawhistoricalmaps– Andmanyothercoolthings

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Resources

ResourceDescripQonFramework(RDF)

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subject predicate object

#blac „Blackfriars“dc:Qtle

#lodge

RDFBasics

•  MakeasserQonsaboutresources•  ResourcesareidenQfiedbyURIs•  AsserQonsaremadeintheformoftriples

•  Subject,predicate,object•  OnlybinaryrelaQonsexpressable•  But,n‐aryrelaQonscanbebrokendownintoseveralbinaryrelaQons

•  Manysyntaxes– Graphsyntax,XML,N‐Tripel

•  Standardizedquerylanguage:SPARQL

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RDFanddimensionaldata

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subject predicate object

#tedfoaf:knows

#leyla

Qme

2000 2007 2014 2021 2028

RDFanddimensionaldata

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subject predicate object

#tedrel:spouseOf

#leyla

#elizabeth

foaf:knows

Qme

2000 2007 2014 2021 2028

RDFanddimensionaldata

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subject predicate object

#tedfoaf:knows

#leyla

#elizabeth

rel:spouseOf

Qme

2000 2007 2014 2021 2028

RDFanddimensionaldata

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#tedrel:spouseOf

#leyla

#elizabeth

rel:spouseOf

Qme

2000 2007 2014 2021 2028

2007‐2014

2014‐…

RDF:InterpretaQonusingmodels

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subject predicate object

#ants 6ex:hasLegs

„Qny“

AworldinwhichonlyantsexistandwhereantsareQnythingswith6legsisamodelforthisgraph.However,ifantsinthisworldhappentohave8legs,thentheworldisnotsaQsfyingthegraph.

RDFanddimensionaldata

•  AnRDFGraphdescribesonetruth– andonlyonetruth

•  Nobuilt‐inmechanismfordescribingdimensionaldata(suchaschangesoverQme)

•  IfyoufollowtheRDFspecificaQon– RDFdoesnotsupportanysortofdimensionaldata

•  But:Wethinkthereisaway!

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InteresQngLinks

•  Erewhonprojectsite:–  hAp://erewhon.oucs.ox.ac.uk/

•  RDFPrimer:–  hAp://www.w3.org/TR/rdf‐primer/

•  RDFSpecificaQon:–  hAp://www.w3.org/RDF/

•  OurthoughtsonRDFandQme+introducQontoRDF:–  hAp://oxforderewhon.wordpress.com/

•  SPARQLspecificaQon:–  hAp://www.w3.org/TR/rdf‐sparql‐query/

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