Dear all,

A while ago, there was an interesting discussion on this list regarding the Memento proposal. The discussion is probably best summarized by referencing Pete Johnston's blog entry:


http://efoundations.typepad.com/efoundations/2009/11/memento-and-negotiating-on-time.html

Following feedback from that discussion, and invaluable input received at a recent meeting with representatives from major web archives (see http://www.mementoweb.org/events/IA201002/) , we have made some revisions/rationalizations to the proposed framework.

The updated perspective is summarized in the slide deck at:

http://www.slideshare.net/hvdsomp/memento-updated-technical-details-february-2010

The major changes are:

(*) Use of a HTTP Link header instead of a HTTP 302 redirect to allow navigation from an Original Resource to a TimeGate for it. This solves a caching issue faced by the initial approach, and also allows applying the framework to non-information resources in order to allow retrieving their prior descriptions (see the final slides of the aforementioned slide deck). (*) Use of the same architecture (distinct Original Resource, TimeGate, Memento) for scenarios that involve Web archives and Content Management Systems as servers of Mementos.

Greetings

Herbert Van de Sompel

==
Herbert Van de Sompel
Digital Library Research & Prototyping
Los Alamos National Laboratory, Research Library
http://public.lanl.gov/herbertv/
tel. +1 505 667 1267





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