An HTTP-Based Versioning Mechanism for Linked Data. Presentation at

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1 Herbert Van de Sompel Robert Sanderson Michael L. Nelson Lyudmila Balakireva Harihar Shankar Scott Ainsworth Memento is partially funded by the Library of Congress Presentation at

2 Time-Series Analysis across DBpedia Versions Data collected through HTTP Navigation

3 Outline Memento - Time Travel for the Web Resource Versioning suggested by Memento Resource Versioning for Linked Data DBpedia Demonstrator

4 Outline Memento - Time Travel for the Web Resource Versioning suggested by Memento Resource Versioning for Linked Data DBpedia Demonstrator

5 Resources have Representations that Change over Time

6 Archived Resources serve prior Representations

7 Dec , 4:51:00 UTC Sep , 20:36:10 UTC Archived Resources w.cnn.com/ archived resource for title=september_11_attacks&oldid= archived resource for

8 Current and Past Web are Not Integrated Current and Past Web based on same technology. But, going from Current to Past Web is a matter of (manual) discovery. Memento wants to make going from Current to Past Web a (HTTP) protocol matter. Memento wants to integrate the Current And Past Web.

9 Vision: Navigate the Web of the Past Robots_exclusion_protocol

10 Vision: Navigate the Web of the Past Robots_exclusion_protocol Oct , 05:30:33 UTC Set browser time dial to

11 Vision: Navigate the Web of the Past Robots_exclusion_protocol Oct , 05:30:33 UTC From Wikipedia History: Version Sep , 20:49:00 UTC

12 Vision: Navigate the Web of the Past Robots Exclusion

13 Vision: Navigate the Web of the Past Oct , 05:30:33 UTC Browser time dial still at

14 Vision: Navigate the Web of the Past Oct , 05:30:33 UTC Browser time dial still at From Internet Archive: Version Nov , 06:21:04 UTC

15 The Memento Approach HTTP navigation to an archived resource by leveraging: The original resource; HTTP datetime content negotiation.

16 Mementos original resource original server archival server

17 DT-conneg with URI-G to get URI-M original resource original server TimeGate Mementos transparently negotiable resource variant resources archival server

18 HTTP Link timegate original resource original server DT-conneg with URI-G to get URI-M TimeGate Mementos transparently negotiable resource variant resources archival server

19 Memento HTTP Flow HEAD R, (Accept-Datetime) Link G GET G, Accept-Datetime 302 M, Vary, TCN, Link R,M GET M, (Accept-Datetime) 200, Content-Datetime, Link R,M

20 The Memento Framework

21 Outline Memento - Time Travel for the Web Resource Versioning suggested by Memento Resource Versioning for Linked Data DBpedia Demonstrator

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29 Prior pictures of the day Current picture of the day

30 Time Travel across Versions of a Picture of the Day Data collected through HTTP Navigation

31 Outline Memento - Time Travel for the Web Resource Versioning suggested by Memento Resource Versioning for Linked Data DBpedia Demonstrator

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36 Outline Memento - Time Travel for the Web Resource Versioning suggested by Memento Resource Versioning for Linked Data DBpedia Demonstrator

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38 Time-Series Analysis across DBpedia Versions Data collected through HTTP Navigation

39 Conclusions URI as access point to page

40 Conclusions Increased value: URI as access point to page and data

41 Conclusions Increased value: URI as access point to current & historical page and data

42 Memento wants to make navigating the Web s Past Easy

43 References Tim Berners-Lee (1996,2000) Generic Resources. Van de Sompel, H., Sanderson, R., Nelson, M.L., Balakireva, L., Ainsworth, S., Shankar, H. (2010) An HTTP-Based Versioning Mechanism for Linked Data. Proceedings of the 3rd Workshop on Linked Data on the Web. Sanderson, R., and Van de Sompel, H. (2010) Making Web Annotations Persistent over Time. Proceedings of the 10th ACM/IEEE-CS Joint Conference on Digital libraries. Van de Sompel, H., Nelson, M.L., Sanderson, R., Balakireva, L., Ainsworth, S., Shankar, H. (2009) Memento: Time Travel for the Web.

44 Memento HTTP Flow HEAD R, (Accept-Datetime) Link G GET G, Accept-Datetime 302 M, Vary, TCN, Link R,B,M GET M, (Accept-Datetime) 200, Content-Datetime, Link R,B,M

45 Memento HTTP Flow: URI-R HEAD R, (Accept-Datetime) HEAD /resource/france HTTP/1.1 Host: dbpedia.org Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO ,utf-8;q=0.7,*;q=0.7

46 Memento HTTP Flow HEAD R, (Accept-Datetime) Link G GET G, Accept-Datetime 302 M, Vary, TCN, Link R,B,M GET M, (Accept-Datetime) 200, Content-Datetime, Link R,B,M

47 Memento HTTP Flow: Success URI-R Link G HTTP/ See Other Server: Virtuoso/ (Solaris) x86_64-sun-solaris VDB Connection: close Content-Type: text/html; charset=utf-8 Date: Tue, 20 Apr :48:51 GMT Accept-Ranges: bytes Location: Transfer-Encoding: chunked Content-Encoding: gzip Link: < ; rel="timegate

48 Memento HTTP Flow HEAD R, (Accept-Datetime) Link G GET G, Accept-Datetime 302 M, Vary, TCN, Link R,B,M GET M, (Accept-Datetime) 200, Content-Datetime, Link R,B,M

49 Memento HTTP Flow: URI-G GET G, Accept-Datetime GET /dbpedia/timegate/ HTTP/1.1 Host: mementoarchive.lanl.gov Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO ,utf-8;q=0.7,*;q=0.7 Accept-Datetime: Wed, 08 Jul :00:00 GMT

50 Memento HTTP Flow HEAD R, (Accept-Datetime) Link G GET G, Accept-Datetime 302 M, Vary, TCN, Link R,B,M GET M, (Accept-Datetime) 200, Content-Datetime, Link R,B,M

51 Memento HTTP Flow: Success URI-G 302 M, Vary, TCN, Link R,B,M HTTP/ Found Date: Tue, 20 Apr :51:00 GMT Server: Apache TCN: choice Vary: negotiate, Accept-Datetime Location: ce.html Link: < < France.html>;rel="first-memento";datetime="Sat, 01 Sep :00:00 GMT", < France.html>;rel="last-memento next-memento";datetime="sun, 01 Nov :00:00 GMT", < France.html>;rel="prev-memento";datetime="Sat, 01 Nov :00:00 GMT", < France.html>;rel="memento";datetime="Wed, 01 Jul :00:00 GMT, < France>;rel="timebundle Transfer-Encoding: chunked

52 Memento HTTP Flow HEAD R, Accept-Datetime Link G GET G, Accept-Datetime 302 M, Vary, TCN, Link R,B,M GET M, Accept-Datetime 200, Content-Datetime, Link R,B,M

53 Memento HTTP Flow: URI-M GET M, (Accept-Datetime) GET /dbpedia/memento/ / HTTP/1.1 Host: mementoarchive.lanl.gov Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO ,utf-8;q=0.7,*;q=0.7 Connection: close

54 Memento HTTP Flow HEAD R, (Accept-Datetime) Link G GET G, Accept-Datetime 302 M, Vary, TCN, Link R,B,M GET M, (Accept-Datetime) 200, Content-Datetime, Link R,B,M

55 Memento HTTP Flow: Success URI-M 200, Content-Datetime, Link R,B,M HTTP/ OK Date: Tue, 20 Apr :51:00 GMT Server: Apache Content-Datetime: Wed, 01 Jul :00:00 GMT Link: < France.html>;rel="timegate", < < France.html>;rel="first-memento";datetime="Sat, 01 Sep :00:00 GMT", < France.html>;rel="last-memento next-memento";datetime="sun, 01 Nov :00:00 GMT", < France.html>;rel="prev-memento";datetime="Sat, 01 Nov :00:00 < France.html>;rel="timebundle Connection: close Transfer-Encoding: chunked Content-Type: text/html; charset=utf-8