Memento is a United States ''National Digital Information Infrastructure and Preservation Program ( NDIIPP)''–funded project aimed at making Web-archived content more readily discoverable and accessible to the public.

Technical description

Memento is defined in RFC 7089 as an implementation of the time dimension of

content negotiation Content negotiation refers to mechanisms defined as a part of HTTP that make it possible to serve different versions of a document (or more generally, representations of a resource) at the same URI, so that user agents can specify which version fi ...

, as defined by Tim Berners Lee in 1996. HTTP accomplishes negotiation of content via headers. The table below shows the different headers available for HTTP that allow clients and servers to find the content that the user desires. To understand Memento fully, one must realize that the header provided by HTTP does not necessarily reflect when a particular version of a web page came into existence. Also, the header may not exist in some cases. To provide more information, the header has been introduced to indicate when a specific representation of a web page was observed on the web. Memento-project-memento-process

Usage

One can find copies of page by simply navigating, in a web browser, to a link formatted, replacing ''urltoarchive'' with the full URL of the page desired:{{cite web, url=http://timetravel.mementoweb.org/guide/api/, title=Time Travel APIs, website=timetravel.mementoweb.org, access-date=2018-05-15, archive-url=https://web.archive.org/web/20180521224610/http://timetravel.mementoweb.org/guide/api/, archive-date=2018-05-21, url-status=live JSON description of a Memento: : http://timetravel.mementoweb.org/api/json/YYYY/''urltoarchive'' : http://timetravel.mementoweb.org/api/json/YYYYMM/''urltoarchive'' : http://timetravel.mementoweb.org/api/json/YYYYMMDD/''urltoarchive'' : http://timetravel.mementoweb.org/api/json/YYYYMMDDHH/''urltoarchive'' : http://timetravel.mementoweb.org/api/json/YYYYMMDDHHMM/''urltoarchive'' ::or redirect to a Memento with a datetime that is close to a desired datetime: : http://timetravel.mementoweb.org/memento/YYYY/''urltoarchive'' : http://timetravel.mementoweb.org/memento/YYYYMM/''urltoarchive'' : http://timetravel.mementoweb.org/memento/YYYYMMDD/''urltoarchive'' : http://timetravel.mementoweb.org/memento/YYYYMMDDHH/''urltoarchive'' : http://timetravel.mementoweb.org/memento/YYYYMMDDHHMM/''urltoarchive''

References

External links

Memento Project

The When of the Web
- Extensive information about the proposal and experiment is available in the November 2009 paper
Memento: Time Travel for the Web
* http://lanlsource.lanl.gov/hello * http://www.cdlib.org/cdlinfo/2010/02/04/web-archive-discovery-memento-implementation-meeting/ Web archiving Web archiving initiatives Los Alamos National Laboratory Old Dominion University