Publish data as Time Consistent Web API based on Provenance (WS-REST 2014)

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Miel Vander Sande

Tecnologia Educação

Cultural Heritage – Open Data!
ARCHIVE & DESSIMINATE
metadata or data!

Web
API
R
R
API
R
R
API
R
R
Resource-oriented scalable & easily combined!
Linked Data, Mashups, Web applicationS
HTTP!

API
R
R
API
R
R
Resources’ value (state) change over time !

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!

Memento
DateTime negotiation over HTTP!
Constant state over resources!
Van de Sompel et al.!
http://mementoweb.org!

R TG
M
Original Resource! TimeGate! Memento(s)!
MMM
Memento

R TG
GET! 200 OK!
Link: URI-TG;!
type=timegate!
MMMM
Memento

MMMMR TG
GET!
Accept-Datetime:!
2014-05-14T00:00:00!
302 Found!
Location: URI-M!
Memento

M1 M3 M4M2
Mementos: encapsulated prior states with timestamp!
Memento

M1 M3 M4M2
Select last valid Memento at given Datetime!
GET URI-TG!
Accept-Datetime: 2014-05-15T00:00:00!
Memento

MMMMR
GET!
TG
200 OK!
Link: URI-R;type=original!
Link: URI-Mn;type=next!
Link: URI-Mp;type=previous!
Memento

Each API works with!
Own Archiving System!
Own Storage Access!
Own File Formats!
Custom implementation required !
Memento

Publish data as!
TIME CONSISTENT API
Storage! API! Memento!
Data management!
Versioning!
Publishing Resources!
HTTP interaction!
Datetime negotiation!
DYNAMIC + GENERIC ??

PROVENANCE!
Who, WHEN & WHAT
happened to my resources?!

M1 M3 M4M2
Provenance !
describes when resource values change!
Was revision of Was revision of Was revision of
A2 A4A3A1
generated generated generated generated

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.

Provenance!
Provenance*!
File versions!
Version Resources!
File!
File Resource!

1. Versioning & MANAGING FILES!
PROVCSV
CSV-CxCSV-CxCSV-CxCSV-Cx
http://git2prov.org
Data Commits Provenance

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

2. CREATING THE API!
200 OK!
Location: URI-L!
The DataTank: instant REST API for heteregeneous data!
PROV
L

GIT!
2. CREATING THE API!
API! L
MMMV
Link: provenance! describes!
CSV
CSV-CxCSV-CxCSV-CxCSV-Cx
PROV

API!
GMP!
R TG
MMMM
L PROV
MMMV
GET!
Link: provenance! describes!
GET! GET!
3. GENERIC Memento PROXY

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!

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

$DeCISION LOGIC WITH REASONING! EYE reasoner and N3 rules select the memento! { :request :datetime ?req_datetime. [] e:findall (?datetime { ?rev prov:endedAtTime ?datetime . (?datetime ?req_datetime) pred:dateTime- less-than-or-equal true. } ?datetime_list) . ?datetime_list e:max ?current_datetime. ?current prov:endedAtTime ?current_datetime. } => { :response :memento ?current. }. IF prov:endedAtTime is largest prior to given ?req_datetime THEN! Selected memento is the ! ?current one$

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> .

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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

9. MMMMR TG GET! Accept-Datetime:! 2014-05-14T00:00:00! 302 Found! Location: URI-M! 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

19. Provenance! Provenance*! File versions! Version Resources! File! File Resource!

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

31. Miel Vander Sande! @miel_vds!

Publish data as Time Consistent Web API based on Provenance (WS-REST 2014)

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