Memento (Time Travel for the Web) Update

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