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Digital Preservation - ODU
The document presents a research overview from Old Dominion University regarding digital preservation and the challenges of accessing historical web content. It discusses concepts such as temporal browsing, the use of URIs, and various preservation strategies, including Memento, a protocol designed to facilitate navigation between current and archived web content. The research emphasizes the importance of integrating the past and current web to enhance accessibility and preserve digital resources.
Digital Preservation - ODU
- 1. Digital Preservation Research atOld Dominion University Justin F. Brunelle The MITRE Corporation Old Dominion University (And hopefully MITRE, soon)
- 2. Why are welistening? • Overview of the problem • BRIEF introduction to ODU WSDL group research • Memento • I’ll be skipping around, so don’t hesitate to interrupt me
- 3. Digital Preservation • Usingthe past Web – Focus of our research • Temporal Browsing – Sessions in the past • Recovering Lost Pages – Is it really gone? • 404s – How to fix broken links?
- 4. 1 same URI maps tosame or very similar content at a later time 2 same URI maps to different content at a later time 3 different URI maps to same or very similar content at the same or at a later time 4 the content can not be found at any URI U1 C1 U1 C1 timeA B U1 C2 U1 C1 timeA B U2 C1 U1 C1 U1 404 timeA B U1 ?? U1 C1 timeA B Change on the Web
- 5. Time to TalkAbout Saving Everything? Dinner for one or two costs more than 1TB disk Wikis have popularized versioning Cool URIs (http://www.w3.org/Provider/Style/URI.html) are widely adopted, e.g.: http://news.yahoo.com/s/ap/20100920/ap_on_el_se/us_alaska_senate http://d.yimg.com/a/p/ap/20100918/capt.67567dbc0a874b689f0b4a5c392f379c-67567dbc0a874b689f0b4a5c392f379c-0.jpg http://d.yimg.com/a/p/afp/20100918/thumb.photo_1284846332993-1-0.jpg Also related projects with cool URI / permalink focus: http://www.citability.org/ http://data.gov/ http://data.gov.uk/
- 6. Fortress Model • Geta lot of money • Buy lots of storage • Hire lots of people • “Look upon my archive ye Mighty, and despair!”
- 7. Alternate Methods • LazyPreservation (McCown) – “How much preservation do I get if I do absolutely nothing?” • Just-In-Time Preservation (Klein) – Wait for it to disappear, then find a “good ‘nuff” version • Shared Infrastructure Preservation – Push content to sites that might preserve it • arXiv.org, IA, WebCite… • Server Enhanced Preservation – Create archival-ready resources
- 8. And Soon… • SocialPreservation – Preserving resources using 3rd party Web Services – Repository for OAI-ORE ReMs – Social network feel – Lazy-esque, server-side reconstruction
- 9. But I digress… •Few years away… • Preliminary research • And now back to the prior research…
- 10.
- 11. WayBack Machine http://web.archive.org/web/*/http://www.thecribs.com/ http://mementoproxy.cs.odu.edu/aggr/timemap/link/http://www.thecribs.com/ from thesewe can create time-based: • indexes • IDF values • PageRank
- 12. Batch Recovery ForSites http://warrick.cs.odu.edu/ Free limo rides for life?!
- 13.
- 14. Real-Time Recovery forURIs Synchronicity - www.cs.odu.edu/~mklein/
- 15. Memento wants tomake navigating the Web’s Past Easy 15 http://www.mementoweb.org http://groups.google.com/group/memento-dev
- 16. What are youtalking about? • Universal Resource Identifier (URI) ~= URL • Resource: – <HTML> • Representation
- 17. W3C Web Architecture:Resource – URI - Representation Resource Representation Represents URI Identifies dereference 17
- 18. dereference content negotiation W3CWeb Architecture: Resource – URI - Representation Resource URI Identifies Representation 1 Represents Representation 2Represents 18
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- 21. Resources have Representationsthat Change over Time 21
- 22. Only the CurrentRepresentation is Available from a Resource 22
- 23. Old Representations areLost Forever 23
- 24. Finding Archived Resources Goto http://www.archive.org/ and search http://cnn.com On http://web.archive.org/web/*/http://cnn.com, select desired datetime 24
- 25. Archived Resources http://web.archive.org/web/20010911203610/http://www.c nn.com/ archivedresource for http://cnn.com http://en.wikipedia.org/w/index.php? title=September_11_attacks&oldid=282333 archived resource for http://en.wikipedia.org/wiki/September_11_attacks Sep 11 2001, 20:36:10 UTC Dec 20 2001, 4:51:00 UTC 25
- 26. Navigating Archived Resources http://en.wikipedia.org/w/index.php? title=September_11_attacks&oldid=282333archived resource for http://en.wikipedia.org/wiki/September_11_attacks3 Dec 20 2001, 4:51:00 UTC http://en.wikipedia.org/wiki/The_Pentagon current Pentagon 26
- 27. Current and PastWeb are Not Integrated 27 • 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 Current And Past Web.
- 28. One Memento HTTPNavigation 28
- 29. Memento HTTP Flow HEADR, Accept-Datetime LinkG 302M, Vary, TCN, LinkR,B,M 200, Content-Datetime, LinkR,B,M GET G, Accept-Datetime GET M, Accept-Datetime
- 30. One Memento HTTPNavigation 30 Scenario • cnn.com includes Link to TimeGate at Internet Archive • URI-R on one server, URI-G & URI-M on another
- 31. Memento HTTP Flow HEADR, Accept-Datetime LinkG 302M, Vary, TCN, LinkR,B,M 200, Content-Datetime, LinkR,B,M GET G, Accept-Datetime GET M, Accept-Datetime
- 32. Memento HTTP Flow:URI-R HEAD R, Accept-Datetime HEAD http://cnn.com/ HTTP/1.1 Host: cnn.com Accept-Datetime: Tue, 11 Sep 2001 20:35:00 GMT Connection: close 32
- 33. Memento HTTP Flow HEADR, Accept-Datetime LinkG 302M, Vary, TCN, LinkR,B,M 200, Content-Datetime, LinkR,B,M GET G, Accept-Datetime GET M, Accept-Datetime
- 34. Memento HTTP Flow:Success – URI-R LinkG HTTP/1.1 200 OK Date: Thu, 21 Jan 2010 00:02:12 GMT Server: Apache Link: <http://web.archive.org/web/timegate/http://cnn.com>; rel="timegate" Content-Length: 255 Connection: close Content-Type: text/html; charset=iso-8859-1 34
- 35. Memento HTTP Flow HEADR, Accept-Datetime LinkG 302M, Vary, TCN, LinkR,B,M 200, Content-Datetime, LinkR,B,M GET G, Accept-Datetime GET M, Accept-Datetime
- 36. GET G, Accept-Datetime MementoHTTP Flow: URI-G GET http://web.archive.org/web/timegate/http://cnn.com HTTP/1.1 Host: web.archive.org Accept-Datetime: Tue, 11 Sep 2001 20:35:00 GMT Connection: close 36
- 37. Memento HTTP Flow HEADR, Accept-Datetime LinkG 302M, Vary, TCN, LinkR,B,M 200, Content-Datetime, LinkR,B,M GET G, Accept-Datetime GET M, Accept-Datetime
- 38. Memento HTTP Flow:Success – URI-G 302M, Vary, LinkR,B,M HTTP/1.1 302 Found Date: Thu, 21 Jan 2010 00:06:50 GMT Server: Apache TCN: choice Vary: negotiate, accept-datetime Location: http://web.archive.org/web/20010911203610/http://www.cnn.com Link: <http://cnn.com/>; rel="original", <http://web.archive.org/web/timebundle/http://cnn.com/>; rel="timebundle”, <http://web.archive.org/web/20000915112826/http://www.cnn.com>; rel=“first- memento”; datetime=“Tue, 15 Sep 2000 11:28:26 GMT”, <http://web.archive.org/web/20080708093433/http://www.cnn.com>; rel=“last-memento”; datetime="Tue, 08 Jul 2008 09:34:33 GMT”, <http://web.archive.org/web/20010911203610/http://www.cnn.com>; rel=“prev-memento”; datetime="Tue, 11 Sep 2001 20:30:51 GMT”, <http://web.archive.org/web/20010911203610/http://www.cnn.com>; rel=“next-memento”; datetime="Tue, 11 Sep 2001 20:47:33 GMT” Content-Length: 0 Connection: close Content-Type: text/plain; charset=UTF-8 38
- 39. Memento HTTP Flow HEADR, Accept-Datetime LinkG 302M, Vary, TCN, LinkR,B,M 200, Content-Datetime, LinkR,B,M GET G, Accept-Datetime GET M, Accept-Datetime
- 40. GET M, Accept-Datetime MementoHTTP Flow: URI-M GET http://web.archive.org/web/20010911203610/http://www.cnn.com HTTP/1.1 Host: web.archive.org Accept-Datetime: Tue, 11 Sep 2001 20:35:00 GMT Connection: close 40
- 41. Memento HTTP Flow HEADR, Accept-Datetime LinkG 302M, Vary, TCN, LinkR,B,M 200, Content-Datetime, LinkR,B,M GET G, Accept-Datetime GET M, Accept-Datetime
- 42. Memento HTTP Flow:Success – URI-M 200, Content-Datetime, LinkR,B,M HTTP/1.1 200 OK Server: Apache-Coyote/1.1 X-Archive-Orig-Accept-Ranges: bytes … Content-Type: text/html;charset=utf-8 Content-Length: 23364 Date: Thu, 21 Jan 2010 00:09:40 GMT Content-Datetime: Tue, 11 Sep 2001 20:36:10 GMT Link: <http://cnn.com/>; rel="original", <http://web.archive.org/web/timebundle/http://cnn.com/>; rel="timebundle”, <http://web.archive.org/web/20000915112826/http://www.cnn.com>; rel=“first-memento”; datetime=“Tue, 15 Sep 2000 11:28:26 GMT”, <http://web.archive.org/web/20080708093433/http://www.cnn.com>; rel=“last-memento”; datetime="Tue, 08 Jul 2008 09:34:33 GMT”, <http://web.archive.org/web/20010911203610/http://www.cnn.com>; rel=“prev-memento”; datetime="Tue, 11 Sep 2001 20:30:51 GMT”, <http://web.archive.org/web/20010911203610/http://www.cnn.com>; rel=“next-memento”; datetime="Tue, 11 Sep 2001 20:47:33 GMT” Connection: close
- 43. What does itall mean? • Cutting edge technology • Existing Infrastructure • Redefining Web surfing • MAJOR “real world” implications
- 44. Closing Thoughts Preservation notfor privileged priesthood http://doi.acm.org/10.1145/1592761.1592794 http://booktwo.org/notebook/wikipedia-historiography/ no more hoary stories about format obsolescence: http://blog.dshr.org/2010/09/reinforcing-my-point.html Don't dessicate resources; leave them on the web Endless metadata is not preservation… archiving as branded service, not infrastructure http://blog.dshr.org/2010/06/jcdl-2010-keynote.html
- 45. Acknowledgements • Slides borrowedfrom: • Dr. Michael L. Nelson: – http://www.slideshare.net/phonedude/my-point-of-view- michael-l-nelson-web-archiving-cooperative – http://www.slideshare.net/phonedude/review-of-web- archiving – http://www.slideshare.net/phonedude/memento-time- travel-for-the-web • Martin Klein: – http://www.slideshare.net/phonedude/synchronicity- justintime-discovery-of-lost-web-pages