Memento Project

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.

Memento is defined in RFC 7089 as an implementation of the time dimension of content negotiation. HTTP accomplishes negotiation of content via a variety of headers that allow clients and servers to find content that the user desires.

The

Last-Modified header provided by HTTP does not necessarily reflect when a particular version of a web page came into existence. Also, theLast-Modified header may not exist in some cases. To provide more information, theMemento-Datetime header has been introduced to indicate when a specific representation of a web page was observed on the web.

Copies of page can be found by simply navigating, in a web browser, to a link formatted, replacing urltoarchive with the full URL of the page desired:

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

• 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/