Publish data as Time Consistent Web API based on Provenance (WS-REST 2014)
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Publish data as Time Consistent Web API based on Provenance (WS-REST 2014)
- 1. Miel Vander Sande! @miel_vds! Publish Data as ! Time consistent ! Web API!
- 2. Cultural Heritage – Open Data! ARCHIVE & DESSIMINATE metadata or data!
- 3. Web API R R API R R API R R Resource-oriented scalable & easily combined! Linked Data, Mashups, Web applicationS HTTP!
- 4. API R R API R R Resources’ value (state) change over time !
- 5. APIs only publish most recent state! Resource state changes lead to inconsistenties in mashup results! http://example.com/average-income! http://example.com/unemployment-rate! 2004 2012 InaccuRate MASHUP!
- 6. Memento DateTime negotiation over HTTP! Constant state over resources! Van de Sompel et al.! http://mementoweb.org!
- 7. R TG M Original Resource! TimeGate! Memento(s)! MMM Memento
- 8. R TG GET! 200 OK! Link: URI-TG;! type=timegate! MMMM Memento
- 10. M1 M3 M4M2 Mementos: encapsulated prior states with timestamp! Memento
- 11. M1 M3 M4M2 Select last valid Memento at given Datetime! GET URI-TG! Accept-Datetime: 2014-05-15T00:00:00! Memento
- 12. MMMMR GET! TG 200 OK! Link: URI-R;type=original! Link: URI-Mn;type=next! Link: URI-Mp;type=previous! Memento
- 13. Each API works with! Own Archiving System! Own Storage Access! Own File Formats! Custom implementation required ! Memento
- 14. Publish data as! TIME CONSISTENT API Storage! API! Memento! Data management! Versioning! Publishing Resources! HTTP interaction! Datetime negotiation! DYNAMIC + GENERIC ??
- 15. PROVENANCE! Who, WHEN & WHAT happened to my resources?!
- 16. M1 M3 M4M2 Provenance ! describes when resource values change! Was revision of Was revision of Was revision of A2 A4A3A1 generated generated generated generated
- 17. PROV-O! provenance in RDF! <Resource> prov:wasRevisionOf <Resource/M3>; prov:wasGeneratedBy :rev4. :rev4 prov:endedAtTime "2014-06-10T14:30:00Z"^^xsd:dateTime. <Resource/M3> prov:wasRevisionOf <Resource/M2>; prov:wasGeneratedBy :rev3. :rev3 prov:endedAtTime "2014-05-14T14:30:00Z"^^xsd:dateTime.
- 18. Publish data as! TIME CONSISTENT API Storage! API! Memento! Data management! Versioning! Publishing Resources! HTTP interaction! Datetime negotiation! PROVENANCE
- 20. 1. Versioning & MANAGING FILES! PROVCSV CSV-CxCSV-CxCSV-CxCSV-Cx http://git2prov.org Data Commits Provenance
- 21. 2. CREATING THE API! POST! /api/definitions! { “uri”: file-url, “type”: “text/csv”, “Delimiter”: “,” } The DataTank: instant REST API for heteregeneous data! file-url commit-url PROV
- 22. 2. CREATING THE API! 200 OK! Location: URI-L! The DataTank: instant REST API for heteregeneous data! PROV L
- 23. GIT! 2. CREATING THE API! API! L MMMV Link: provenance! describes! CSV CSV-CxCSV-CxCSV-CxCSV-Cx PROV
- 24. API! GMP! R TG MMMM L PROV MMMV GET! Link: provenance! describes! GET! GET! 3. GENERIC Memento PROXY
- 25. Decision Engine GENERIC Memento PROXY TG PROV GET! Accept-Datetime:! 2014-05-14T00:00:00! N3 rules EYE Reasoner M + V 302 Found! Location: URI - M!
- 26. DeCISION LOGIC WITH SEMANTIC REASONING! EYE reasoner and N3 rules select memento! prov:wasRevisionOf rdfs:subPropertyOf :memento. :memento a owl:TransitiveProperty. :request :datetime "2014-05-15T00:00:00Z"^^xsd:dateTime
- 27. DeCISION LOGIC WITH REASONING! EYE reasoner and N3 rules select the memento! { :request :datetime ?req_datetime. [] e:findall (?datetime { ?rev prov:endedAtTime ?datetime . (?datetime ?req_datetime) pred:dateTime- less-than-or-equal true. } ?datetime_list) . ?datetime_list e:max ?current_datetime. ?current prov:endedAtTime ?current_datetime. } => { :response :memento ?current. }. IF prov:endedAtTime is largest prior to given ?req_datetime THEN! Selected memento is the ! ?current one
- 28. DeCISION LOGIC WITH REASONING! EYE reasoner and N3 rules select the memento! :response :memento <Resource/M1> . :response :next-memento <Resource/M2> . :response :last-memento <Resource> .
- 29. Publish data as! TIME CONSISTENT API Storage! API! Memento! Data management! Versioning! Publishing Resources! HTTP interaction! Datetime negotiation! DYNAMIC + GENERIC ??
- 30. Publish data as! TIME CONSISTENT API Storage! API! Memento! Data management! Versioning! Publishing Resources! HTTP interaction! Datetime negotiation! PROVENANCE