Herbert Van de Sompel
Digital Library Researcher
Los Alamos National Laboratory
Robert Sanderson
Scientist
Los Alamos National Laboratory
Michael Nelson
Assistant Professor
Department of Computer Science
Old Dominion University
Frustrated attempts to retrieve old versions of Web pages abound. Web site visitors frequently bookmark pages only to find later, upon revisiting the site, that the current content is not even remotely related to what caught their initial interest. Remnants of the past Web are available, and there are many efforts ongoing to archive even more Web content, but the past Web is not as readily accessible as today’s. For example, someone wanting to see an archived version of http://cnn.com can go to the Internet Archive’s Wayback Machine and search for it there. Or old versions of a Wikipedia page are available by going to the current page and from there following a link to one of the prior versions.
But accessing archived Web content feels more like walking to a library than using the Web in the usual way. It would be much easier to simply connect to a Web site indicating an interest in the pages of March 20, 2008, for example, instead of the current pages, by activating a time machine in your own browser or bot. The Memento solution has been designed to achieve this solution. It is based on existing HTTP capabilities applied in a novel way to add the temporal dimension. The result is a framework in which archived resources can seamlessly be reached via the uniform resource identifier (URI) of their original: protocol-based time travel for the Web.
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