The slides which I used at the Dagstuhl seminar on Principles of Provenance (Feb.2012) for presenting the main contributions and open issues of the PROV-AQ document created by the W3C provenance working group.

1. An Overview on PROV-AQ: Provenance Access and Query Editors: Authors: Graham Klyne Luc Moreau Paul Groth Olaf Hartig Yogesh Simmhan James Myers Timothy Lebo Khalid Belhajjame Simon Miles Presentation at the Dagstuhl Seminar on Principles of Provenance February 29, 2012

3. retrieve, and

6. Use standard Web protocols

9. query mechanisms

10. Outline Key Concepts Simple Mechanisms Provenance Services Querying Provenance Information Open Issues

12. Entity

13. Provenance information

14. Provenance URI

15. Entity URI * Architecture of the World Wide Web, Volume One, W3C Rec.

17. What is the relevant entity URI used in some provenance information?

18. What if there is no provenance URI?

19. What if there is no entity URI?

21. Management of provenance information

22. Outline Key Concepts Simple Mechanisms Provenance Services Querying Provenance Information Open Issues

28. Outline Key Concepts Simple Mechanisms Provenance Services Querying Provenance Information Open Issues

38. Example representation in JSON format

40. Example representation in JSON format

41. Example representation in Turtle (i.e.RDF data)

43. Extract URI template for locations resources

44. Form Provenance-Locations-URI (by instantiating the template with Entity-URI )

45. Obtain provenance locations resource (by dereferencing Provenance-Locations-URI )

46. Extract relevant Provenance-URI s … to retrieve provenance URI(s)

47. Outline Key Concepts Simple Mechanisms Provenance Services Querying Provenance Information Open Issues

50. Protocol for SPARQL query processing services

52. Use case: ask for a particular piece of provenance information only SELECT ?provenance_uri WHERE { ?entity prism:doi &quot;1234.5678&quot; ; prov:hasProvenance ?provenance_uri . } SELECT ?start_time WHERE { <http://example.org/X> prov:wasGeneratedBy ?act . ?act prov:startedAt ?start . ?start prov:inXSDDateTime ?start_time . }

53. Outline Key Concepts Simple Mechanisms Provenance Services Querying Provenance Information Open Issues

56. General approach is out of scope { &quot;provenance_service_uri&quot;: &quot;http://example.org/PS/&quot;, &quot;provenance_locations_template&quot;: &quot; http://ps.example.org/loc?uri = {uri} &quot; }

58. More advanced discovery service and query mechanisms

59. These slides have been created by Olaf Hartig http://olafhartig.de This work is licensed under a Creative Commons Attribution-Share Alike 3.0 License http://creativecommons.org/licenses/by-sa/3.0/

60. Backup Slides

62. Provenance Service URI ... … for resources accessed by HTTP Link: Service-URI ; rel=&quot;provenance-service&quot;; anchor=&quot; Entity-URI &quot;

65. provenance information resources

71. Extract URI template for information resources

72. Form Provenance-URI (by instantiating the template with Entity-URI )

73. Obtain provenance information resource (by dereferencing Provenance-URI )

74. Extract relevant provenance information … to retrieve provenance information