This page is a translated version of the page Help:Extension:Memento and the translation is 67% complete.

Ifaagun yii n pese agbara irin-ajo akoko wẹẹbu fun awọn iru ẹrọ MediaWiki. It introduces negotiation in the datetime dimension for web content by leveraging the Memento protocol specified in RFC 7089.[1][2] With a browser extension installed, like the Memento Extension for Chrome [3] or Firefox [4], a user can select a date and time using their browser and browse the web as if it were that date. With this extension, MediaWiki will support the same time travel protocol natively supported by several web archives [5]. Ifaagun yii ngbanilaaye awọn alejo aaye MediaWiki lati lọ kiri lainidi laarin MediaWiki ati gbogbo awọn aaye miiran ti o ṣe atilẹyin Memento.

Technical information on how to install and configure this extension is available at Extension:Memento.

An Example Use Case Using the Memento MediaWiki Extension

Aworan ti o wa ni apa ọtun fihan ọran lilo ti o ṣeeṣe. In step 1, the user starts on a web page at and uses the Memento for Chrome browser extension to choose a date and time of December 15, 2012. Pẹlu afikun titẹ-ọtun kọọkan, Ilana Memento n pese awọn ẹya ti awọn oju-iwe lati ọjọ yẹn lati awọn wiki mejeeji ati awọn ibi ipamọ wẹẹbu. Ni igbesẹ 5 wọn wa itọkasi kan lati ọdun 2009 ati yan lati yi ọjọ aṣawakiri pada si Oṣu Kẹrin Ọjọ 7, Ọdun 2009, ati lẹhinna tẹsiwaju lati lọ kiri wẹẹbu, bii ẹni pe ọjọ yẹn ni 2009.

Ọran lilo ti o pọju gbigba olumulo laaye lati ṣaja awọn ile-ipamọ wẹẹbu lainidi ati MediaWiki ni lilo Ifaagun Memento MediaWiki

Eyi ni awọn alaye ti aworan atọka:

  1. The user is at, sets the time travel date to 2012-12-15.
  2. The page has a link to The user right-clicks the link in an attempt to access the version of that page that was active on 2012-12-15.
  3. Red Arrow transition 1
    1. The user lands on which was the active page from 2012-12-04 until 2013-02-28.
    2. The page has a link to The user right-clicks the link in an attempt to access the version of that page that was active on 2012-12-15.
  4. Red Arrow transition 2
    1. The user lands on which was the active page from 2012-12-15 until 2012-12-19.
    2. The page has a link to The user right-clicks the link in an attempt to access the version of that page that was active on 2012-12-15.
  5. Green Arrow transition 3
    1. The user lands on, a version of the page available from the Internet Archive, with archival datetime 2012-12-18.
    2. The user goes back to, and scrolls down in the page.
    3. The page has a Reference: 52. ^ "Web Content Accessibility Guidelines (WCAG) Overview". World Wide Web Consortium. Retrieved 7 April 2009. in which Web Content Accessibility Guidelines (WCAG) Overview links to
    4. The user resets the time travel date to the indicated retrieval time of the linked page, 2009-04-07.
    5. The user right-clicks the link to in an attempt to access the version of that page that was active on 2009-04-07.
  6. Blue Arrow transition 4
    1. The user lands on, a version of the page available from the Internet Archive, with archival datetime 2009-04-01.

Awọn ọran lilo afikun

  • Digital Archaeology. Wikis are becoming a source of digital archeology, and accessing prior versions of pages become more and more important to many users in the Humanities when trying to determine how the world has evolved.
  • Avoiding spoilers. MediaWikis are used as fan platforms, such as the Game of Thrones wiki. Because the TV episodes don't air at the same time across the world, many current pages in such fan platforms contain spoilers. To avoid spoilers, fans can use Memento to set a date prior to the episode containing the spoilers they want to avoid, and view the wiki without spoilers. Related to this use case, sports fans can potentially use the extension to avoid sports results. An exploration of this concept was covered in this paper [6].
  • Casual Historical Interest. Users often wish to see versions of resources prior to certain events, for example, the page about Michael Jackson in Wikipedia both before his death. And, once they are on an old version of that page, they may want to see what other Wikipedia pages linked from the Michael Jackson page looked like at that time.
  • Terminology changes. MediaWikis are used for scientific purposes, for example, as platforms to provide and maintain terminology definitions. Such definitions may change over time and may be interrelated. From the perspective of scholarly discourse, it may be important to be able to see exactly what the interrelated definitions looked like, for example, when they were used in a scholarly publication.
  • Seamless web time travel. Pages in MediaWikis commonly contain links to the web at large. Sometimes it is helpful, and sometimes necessary (e.g. when links are dead) to see the state of such linked resources at some time in the past, for example, at the time when a linked resource was accessed by the editor. This functionality is supported out of the box by a Memento client and thus not require a MediaWiki to install this Memento extension. However, with the extension installed, temporal navigation is possible both within and outside of the MediaWiki. A user would experience seamless web time travel between wikis, web archives, and other content management systems, such as WordPress [7].
  • Editor Review. MediaWiki editors can benefit from Memento time travel by being able to easily visit the state of interrelated pages at some time in the past, for example, to assess the differences before and after editing wars.
  • Temporal Text Mining and Data Extraction. By supporting datetime negotiation to access page versions, a MediaWiki allows software agents to easily access the state of the entire system as it was at a certain point in the past, or to collect all versions of a page that were published during past time range. This capability may be helpful in support of text mining and data extraction activities and applies to both page-oriented MedaWikis and to data wikis such as Wikidata. It potentially allows for republication of structured information at a frequency that remains in lock step with the evolution of a MediaWiki, rather than in batch mode as is the case with DBpedia. See also the paper [8] with this regard.

How Memento Works

This extension allows access to versions of MediaWiki pages by implementing support for the Accept-Datetime HTTP request header to perform datetime negotiation, a variation on content negotiation specified in RFC 2295.[9]The datetime for negotiation is expressed as a value of the Accept-Datetime HTTP header. The Memento extensions for Chrome or Firefox or the command line utility mcurl [10] can be used to set this datetime value. Awọn orisun pataki kan ti a npè ni TimeGate gba akoko ọjọ yii ati lẹhinna tun olumulo pada si oju-iwe naa bi o ti wa ni ọjọ yẹn.

Idunadura akoko ọjọ ṣiṣẹ ni awọn igbesẹ ti o rọrun meji:

  • When a client requests a page, this extension will provide the URI of a TimeGate for the page in the HTTP Link header. The TimeGate is capable of datetime negotiation to access versions of the page.
  • When a client navigates to the TimeGate and performs datetime negotiation with it, the TimeGate provides the client with the version of the page that was operational at the datetime used for negotiation. The creation datetime of that version is provided in the Memento-Datetime HTTP response header, along with links in the HTTP Link header including a link to the current version of the page and to a TimeMap for the page.

Ifaagun yii tun ngbanilaaye iwọle si TimeMap kan fun oju-iwe MediaWiki, eyiti o jẹ iwe ti o ṣe atokọ gbogbo awọn ẹya oju-iwe naa bii TimeGate fun oju-iwe naa. Nigbati alabara kan ba beere oju-iwe kan, itẹsiwaju yii yoo pese URI ti TimeMap kan fun oju-iwe naa ni akọsori Ọna asopọ HTTP.

Ifaagun MediaWiki yii nlo awọn olutọju kanna gẹgẹbi sọfitiwia MediaWiki lati sopọ si ibi ipamọ data naa. Nitorinaa gbogbo awọn igbanilaaye data data ti o wa ati awọn igbanilaaye iwọle oju-iwe jẹ ọlá. It uses a 'DB_SLAVE' database connection, which means that the database connection can only read from the tables. Nitorina, plug-in yii ko ṣe iyipada si data ninu wiki.


The best way to experience this extension is by installing Memento Time Travel for the Chrome browser. After installing Memento Time Travel, enter the URL of a page in your wiki and set the desired date-time. Memento Time Travel will use the TimeGate installed in the wiki to load the version of the article that was live at the requested date-time.

After setting the date-time in Memento Time Travel, a user can click both the internal and external links in the page and navigate the web in the past.

MediaWiki Concerns


MediaWiki, by default, retrieves the most recent version of a template when transcluded in an article. This extension allows datetime content negotiations on transcluded templates.

Special Pages

Special pages under the URL do not have a history, i.e. there are no revisions to these pages. Hence, the Memento extension cannot perform time negotiations on these resources.

Deleted Contributions

This plugin does not make any deleted revisions accessible.


This extension searches for and retrieves the mementos using the modified time of an article. Timestamps are not unique identifiers and it is possible that an article will have more than one revision at any given time. This extension handles this situation by redirecting to the revision that has the highest revision id.

MediaWiki does not resolve deleted revisions using revision ids, but use timestamps instead in their URIs. Hence, we could not come up with a way to resolve a situation when more than one deleted revision has the same timestamp.

Wikis with Memento Plug-in Installed