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MediaWiki
[ temporary import ]
please note:
- the content below is remote from Wikipedia
- it has been imported raw for GetWiki
{{short description|Wiki software}}{{Selfref|For information about the usage of MediaWiki in Wikipedia, see (Help:MediaWiki namespace).}}{{Distinguish|Wikimedia}}{{pp-move|small=yes}}{{Use mdy dates|date=November 2014}}







factoids
| language footnote = | genre = WikiGPLv2+HTTPS://WWW.MEDIAWIKI.ORG/WIKI/COPYRIGHTWORK=MEDIAWIKI.ORGARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20150919145522/HTTPS://WWW.MEDIAWIKI.ORG/WIKI/COPYRIGHTDEAD-URL=NO, mdy-all, | alexa =weblink}}| standard = | AsOf = | bodystyle = width:323px}}MediaWiki is a free and open-source wiki engine. It was developed for use on Pseudopedia in 2002, and given the name "MediaWiki" in 2003. It remains in use on Wikipedia and almost all other Wikimedia sites, including Wiktionary, Wikimedia Commons and Wikidata; these sites continue to define a large part of the requirement set for MediaWiki.WEB,weblink What is MediaWiki?, 2013-08-04, MediaWiki was originally developed by Magnus Manske and improved by Lee Daniel Crocker.(mailarchive:wikipedia-l/2001-August/000382.html|Magnus Manske's announcement of "PHP Wikipedia"), wikipedia-l, 2001-08-24BOOK, MediaWiki, Daniel J. Barrett, Barrett, Daniel J., O'Reilly Media, October 2008, 978-0-596-51979-7,weblink April 23, 2010,weblink" title="web.archive.org/web/20100505210622weblink">weblink May 5, 2010, no, mdy-all, Its development has since then been coordinated by the Wikimedia Foundation.MediaWiki is written in the PHP programming language and stores all text content into a database. The software is optimized to efficiently handle large projects, which can have terabytes of content and hundreds of thousands of hits per second.WEB, ÄŒesky, Wikipedia:Statistics&oldid=352738565, Wikipedia:Statistics â€“ Wikipedia, the free encyclopedia, En.wikipedia.org, 2010-05-30, Because Wikipedia is one of the world's largest websites, achieving scalability through multiple layers of caching and database replication has been a major concern for developers. Another major aspect of MediaWiki is its internationalization; its interface is available in more than 300 languages. The software has more than 900 configuration settingsWEB, https:www.mediawiki.org/wiki/Category:MediaWiki_configuration_settings, Category:MediaWiki configuration settings, MediaWiki, September 11, 2016, 2016-09-11,weblink" title="web.archive.org/web/20141110154304weblink">weblink November 10, 2014, no, mdy-all, and more than 1,900 extensions available for enabling various features to be added or changed.WEB,weblink Extension Matrix, MediaWiki, 2017-09-06,weblink September 11, 2016, no, mdy-all, Besides its use on Wikimedia sites, MediaWiki has been used as a knowledge management and content management system on many thousands of websites, public and private, including the websites Fandom and wikiHow, and major internal installations like Intellipedia and Diplopedia.

License

MediaWiki is free and open source software and is distributed under the terms of the GNU General Public License version 2 or any later version. Its documentation, located at mediawiki.org, is released under the Creative Commons BY-SA 3.0 license and partly in the public domain.WEB, www.mediawiki.org/w/index.php?title=Project:Copyrights&oldid=262877, MediaWiki.org Project:Copyrights, 2009-08-17, Specifically, the manuals and other content at MediaWiki.org are Creative Commons-licensed, while the set of help pages intended to be freely copied into fresh wiki installations and/or distributed with MediaWiki software is public domain. This was done to eliminate legal issues arising from the help pages being imported into wikis with licenses that are incompatible with the Creative Commons license.WEB, https:www.mediawiki.org/w/index.php?title=Project:PD_help&oldid=320349, Project:PD help, MediaWiki, 2010-05-30, MediaWiki development has generally favored the use of open-source media formats.{{citation|url=http://news.cnet.com/8301-17939_109-10103177-2.html|title=Wikipedia gears up for flood of video and photo files|date=November 19, 2008|author=Rafe Needleman|publisher=C-Net|access-date=April 23, 2010|archive-url=https://web.archive.org/web/20090806080149weblink|archive-date=August 6, 2009|dead-url=no|df=mdy-all}}

Development

MediaWiki has an active volunteer community for development and maintenance. Users who have made meaningful contributions to the project by submitting patches are generally, upon request, granted access to commit revisions to the project's Git/Gerrit repository.WEB,weblink Development policy, MediaWiki, July 19, 2013, 2013-08-04, There are also paid programmers who primarily develop projects for the Wikimedia Foundation. MediaWiki developers participate in the Google Summer of Code by facilitating the assignment of mentors to students wishing to work on MediaWiki core and extension projects.WEB,weblink Summer of Code, MediaWiki, March 26, 2013, 2013-08-04, As of November 2012, there were about two hundred developers who had committed changes to the MediaWiki core or extensions within the past year.WEB,weblink Wikimedia, Open Hub, 2012-11-15,weblink September 14, 2017, no, mdy-all, Approximate counts (not deduplicated) as of 2012-11-04: 139 for core, 155 for extensions supported by WMF, 190 and 42 for extensions only hosted on WMF's Git and SVN repositories respectively.Major MediaWiki releases are generated approximately every six months by taking snapshots of the development branch, which is kept continuously in a runnable state;WEB,weblink Version lifecycle, MediaWiki, September 5, 2018, 2018-10-21, minor releases, or point releases, are issued as needed to correct bugs (especially security problems).MediaWiki also has a public bug tracker, phabricator.wikimedia.org, which runs Phabricator. The site is also used for feature and enhancement requests.

History

File:Magnus Manske.png|thumb|Magnus ManskeMagnus ManskeFile:Lee Daniel Crocker.JPG|thumb|Lee Daniel CrockerLee Daniel Crocker(File:Brion Vibber May 2008.JPG|thumb|Brion Vibber in 2008)When Wikipedia was first launched in January 2001, it ran on the existing wiki software UseModWiki, which is written in Perl and stores all wiki pages in text files. This software soon proved limiting, both in its functionality and its performance. In mid-2001, Magnus Manske, a developer and student at the University of Cologne, who was also a Wikipedia editor, began working on new software that would replace UseModWiki, specifically for use by Wikipedia. This software was written in PHP and stored all its information in a MySQL database. It launched on the English Wikipedia in January 2002, and was gradually deployed on all the Wikipedia language sites of that time. This software was referred to as "the PHP script" and as "phase II", with the name "phase I" retroactively given to the use of UseModWiki.Increasing usage soon caused load problems again, and soon afterward, another rewrite of the software began, done by Lee Daniel Crocker, which was first known as "phase III". This new software was also written in PHP with a MySQL backend, and kept the basic interface of the phase II software, but was meant to be more scalable. It went live on Wikipedia in July 2002.The Wikimedia Foundation was announced on June 20, 2003, and in July, Wikipedia contributor Daniel Mayer suggested the name "MediaWiki" for the software, as a play on "Wikimedia".WEB,weblink Mayer, Daniel, Phase IV, Wikibooks.org/.com and WikimediaFoundation.org/.com (was Wikis and uniformity), Wikipedia-L mailing list archives, The name was gradually phased in beginning in August 2003. The name has frequently caused confusion due to its (intentional) similarity to the "Wikimedia" name (which itself is similar to "Wikipedia").WEB,weblink Differences between Wikipedia, Wikimedia, MediaWiki, and wiki, MediaWiki, May 25, 2010, 2010-05-30,weblink" title="web.archive.org/web/20090701102809weblink">weblink July 1, 2009, no, mdy-all, The product logo was created by Erik Möller using a flower photograph taken by Florence Nibart-Devouard, and was originally submitted to the logo contest for a new Wikipedia logo, held in mid-2003.WEB, International logo contest/results,weblink Wikimedia contributors, Meta-wiki, Wikimedia Foundation, January 10, 2007, 2007-03-14, The logo came in third place, and was chosen to represent MediaWiki instead of Wikipedia, with the second place logo used for the Wikimedia Foundation.WEB, Wikimedia contributors, Historical/Logo history,weblink Wikimedia Foundation, January 17, 2007, 2007-03-14, Meta-wiki, The double square brackets symbolize the syntax MediaWiki uses for creating hyperlinks to other wiki pages, and the sunflower represents the diversity of content on Wikipedia, the constant growth and also the wildness.WEB, File talk:EloquenceSunflowerNew-Small.png – Meta,weblink Erik Möller, Meta-wiki, Wikimedia Foundation, July 26, 2003, 2013-02-03, Later, {{vanchor|Brion Vibber}}, the Chief Technical Officer of the Wikimedia Foundation,BOOK, (Everything Is Miscellaneous: The Power of the New Digital Disorder), David Weinberger, David Weinberger, 2007, Times Books, 0-8050-8043-0, 99, took up the role of release manager and most active developer.WEB, www.mediawiki.org/w/index.php?title=MediaWiki_history&oldid=618636, 2013-08-04, MediaWiki history, MediaWiki website, WEB, https:www.youtube.com/watch?v=DWef69ItVrU, April 28, 2006, 2009-09-23, Wikipedia and MediaWiki, Presentation MediaWiki development (video),weblink" title="web.archive.org/web/20110414151917weblink">weblink April 14, 2011, no, mdy-all, Major milestones in MediaWiki's development have included the categorization system, added in 2004; parser functions, added in 2006; flagged revisions, added in 2008;{{citation |title = Introducing new features to Wikipedia |author1 = M Schindler |author2 = D Vrandecic |publisher = Proceedings of WebSci |year = 2009 |url =weblink |access-date = June 24, 2018 |archive-url =weblink |archive-date = June 24, 2018 |dead-url = no |df = mdy-all }} the "ResourceLoader", a delivery system for CSS and JavaScript, added in 2011;WEB,weblink MediaWiki ResourceLoader, Mediawiki.org, 2013-07-06,weblink" title="web.archive.org/web/20130308030735weblink">weblink March 8, 2013, no, mdy-all, and the VisualEditor, a WYSIWYG (What You See Is What You Get) editor, added in 2013.WEB,weblink MediaWiki, September 15, 2013, VisualEditor – MediaWiki,weblink September 27, 2013, no, mdy-all,

Version history

The first version of MediaWiki, 1.1, was released in December 2003. The current stable version of MediaWiki, 1.31.0, was released in June 2018.

Sites using MediaWiki

{{see also|Category:MediaWiki websites}}File:Wikia Block user.jpeg|thumb|WikiaWikiaMediaWiki's most famous use has been in Pseudopedia and, to a lesser degree, the Wikimedia Foundation's other projects. Fandom, a wiki farm, runs on MediaWiki. Other public wikis that run on MediaWiki include wikiHow and SNPedia. WikiLeaks began as a MediaWiki-based website, but is no longer a wiki.A number of alternative wiki encyclopedias to Wikipedia run on MediaWiki, including Citizendium, Metapedia, Scholarpedia and Conservapedia. MediaWiki is also used internally by a large number of companies, including Novell and Intel.MediaWiki testimonials {{Webarchive|url=https://web.archive.org/web/20120111223511weblink |date=January 11, 2012 }}, mediawiki.orgWEB,weblink The story of Intelpedia: A model corporate wiki, Socialmedia.biz, August 16, 2013,weblink" title="web.archive.org/web/20130916232246weblink">weblink September 16, 2013, no, mdy-all, Notable usages of MediaWiki within governments include Intellipedia, used by the United States Intelligence Community, Diplopedia, used by the United States Department of State, and milWiki, a part of milSuite used by the United States Department of Defense. United Nations agencies such as the U.N. Development Programme and INSTRAW chose to implement their wikis using MediaWiki because "this software runs Wikipedia and is therefore guaranteed to be thoroughly tested, will continue to be developed well into the future, and future technicians on these wikis will be more likely to have exposure to MediaWiki than any other wiki software."WEB,weblink A stealth transformation: introducing wikis to the UN, A. Maron, M. Maron, Knowledge Management for Development Journal, 2007, October 9, 2010,weblink" title="web.archive.org/web/20110504030508weblink">weblink May 4, 2011, no, mdy-all, The Free Software Foundation uses Mediawiki to implement the LibrePlanet website.WEB,weblink LibrePlanet Homepage, December 10, 2018,weblink" title="web.archive.org/web/20110318110137weblink">weblink March 18, 2011, no, mdy-all,

Key features

MediaWiki provides a rich core feature set and a mechanism to attach extensions to provide additional functionality.

Internationalization and localisation

File:Translating the wiki way.webm|thumb|400px|thumbtime=16:00|alt=Niklas Laxström, "Translating the wiki way: Simple, fast, fun", Wikimania 2012|Niklas Laxström explains the features that allowed translatewiki.nettranslatewiki.netDue to the strong emphasis on multilingualism in the Wikimedia projects, internationalization and localization has received significant attention by developers. The user interface has been fully or partially translated into more than 300 languages on translatewiki.net,See also: Translation statistics {{Webarchive|url=https://web.archive.org/web/20081025142809weblink |date=October 25, 2008 }} and (meta:Multilingual MediaWiki|Multilingual MediaWiki). and can be further customized by site administrators (the entire interface is editable through the wiki).Several extensions, most notably those collected in the , are designed to further enhance the multilingualism and internationalization of MediaWiki.

Installation and configuration

Installation of MediaWiki requires that the user have administrative privileges on a server running both PHP and a compatible type of SQL database. Some users find that setting up a virtual host is helpful if the majority of one's site runs under a framework (such as Zope or Ruby on Rails) that is largely incompatible with MediaWiki.{{citation|title=Installing and Customizing MediaWiki|url=http://www.linuxjournal.com/article/8754?page=0,1|author=Lerner, Reuven M.|publisher=Linux Journal|date=February 23, 2006|access-date=April 23, 2010|archive-url=https://web.archive.org/web/20100406010012weblink|archive-date=April 6, 2010|dead-url=no|df=mdy-all}} Cloud hosting can enable a user to dispense with the task of building a new server by hand.{{citation|title=Deploying PHP applications on IBM DB2 in the cloud: MediaWiki as a case study|url=http://portal.acm.org/citation.cfm?id=1723069|author=Petrazickis, Leons|publisher=Proceedings of the 2009 Conference of the Center for Advanced Studies on Collaborative Research|year=2009}}An installation PHP script is accessed via a web browser to initialize the wiki's settings. It prompts the user for a minimal set of required parameters, leaving further changes, such as enabling uploads,WEB,weblink$wgEnableUploads, Manual:$wgEnableUploads, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20100625234102weblink">weblink$wgEnableUploads, June 25, 2010, no, mdy-all, adding a site logo,WEB,weblink$wgLogo, Manual:$wgLogo, MediaWiki, December 12, 2009, 2010-05-30,weblink" title="web.archive.org/web/20100625234904weblink">weblink$wgLogo, June 25, 2010, no, mdy-all, and installing extensions, to be made by modifying configuration settings contained in a file called LocalSettings.php.WEB,weblink Manual:LocalSettings.php, MediaWiki, March 29, 2007, 2010-05-30,weblink" title="web.archive.org/web/20100625233619weblink">weblink June 25, 2010, no, mdy-all, Some aspects of MediaWiki can be configured through special pages or by editing certain pages; for instance, abuse filters can be configured through a special page,WEB,weblink Extension:AbuseFilter, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20100625224424weblink">weblink June 25, 2010, no, mdy-all, and certain gadgets can be added by creating JavaScript pages in the MediaWiki namespace.WEB,weblink wikEd, "Cacycle",weblink" title="web.archive.org/web/20071123151215weblink">weblink November 23, 2007, no, mdy-all, The MediaWiki community publishes a comprehensive installation guide.WEB,weblink Manual:Installation guide, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20100625235352weblink">weblink June 25, 2010, no, mdy-all,

Markup

One of the earliest differences between MediaWiki (and its predecessor, UseModWiki) and other wiki engines was the use of "free links" instead of CamelCase. When MediaWiki was created, it was typical for wikis to require text like "WorldWideWeb" to create a link to a page about the World Wide Web; links in MediaWiki, on the other hand, are created by surrounding words with double square brackets, and any spaces between them are left intact, e.g. {{brackets|World Wide Web}}. This change was logical for the purpose of creating an encyclopedia, where accuracy in titles is important.MediaWiki uses an extensibleWEB,weblink Manual:Extending wiki markup, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20110501083425weblink">weblink May 1, 2011, no, mdy-all, lightweight wiki markup designed to be easier to use and learn than HTML. Tools exist for converting content such as tables between MediaWiki markup and HTML.WEB,weblink HTML to Wiki Converter â€“ tables, WMF Labs, March 29, 2008, 2014-06-12,weblink July 13, 2014, no, mdy-all, Efforts have been made to create a MediaWiki markup spec, but a consensus seems to have been reached that Wikicode requires context-sensitive grammar rules.WEB,weblink Markup spec, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20071219052149weblink">weblink December 19, 2007, no, mdy-all, WEB,weblink Extricating Meaning from Wikimedia Article Archives, 2011-01-02,weblink" title="web.archive.org/web/20110310023318weblink">weblink March 10, 2011, no, mdy-all, The following side-by-side comparison illustrates the differences between wiki markup and HTML:{| class="wikitable"!MediaWiki syntax!Equivalent HTML!Rendered output style="vertical-align:top;"|

A dialogue

"Take some more tea," the March Hare said to Alice, very earnestly."I've had nothing yet," Alice replied in an offended tone: "so I can't take more.""You mean you can't take less," said the Hatter: "it's very easy to take more than nothing."|A dialogue"Take some more tea," the March Hare said to Alice, very earnestly."I've had nothing yet," Alice replied in an offended tone: "so I can't take more.""You mean you can't take less," said the Hatter: "it's very easy to take more than nothing."|A dialogue"Take some more tea," the March Hare said to Alice, very earnestly."I've had nothing yet," Alice replied in an offended tone: "so I can't take more.""You mean you can't take less," said the Hatter: "it's very easy to take more than nothing."(Quotation above from Alice's Adventures in Wonderland by Lewis Carroll)

Editing interface

{{see also|VisualEditor}}(File:Mediawiki-edit.png|thumb|300px|Editing interface of MediaWiki 1.9, showing the edit toolbar and some examples of wiki syntax.)MediaWiki's default page-editing tools have been described as somewhat challenging to learn.{{citation|publisher=Tech & Learning|url=http://www.techlearning.com/article/6164|title=Wild about Wikis|author=Jakes, David|date=August 15, 2006|access-date=April 23, 2010|archive-url=https://web.archive.org/web/20100502052101weblink|archive-date=May 2, 2010|dead-url=yes|df=mdy-all}} A survey of students assigned to use a MediaWiki-based wiki found that when they were asked an open question about main problems with the wiki, 24% cited technical problems with formatting, e.g. "Couldn't figure out how to get an image in. Can't figure out how to show a link with words; it inserts a number."{{citation|title=Wiki as a professional development tool|author1=Brian Foley|author2=Tae Chang|lastauthoramp=yes|year=2008|publisher=Technology and Teacher Education|url=http://www.csun.edu/~bfoley/AERA_Wiki.pdf|access-date=April 23, 2010|archive-url=https://web.archive.org/web/20110430024752weblink|archive-date=April 30, 2011|dead-url=no|df=mdy-all}}To make editing long pages easier, MediaWiki allows the editing of a subsection of a page (as identified by its header). A registered user can also indicate whether or not an edit is minor. Correcting spelling, grammar or punctuation are examples of minor edits, whereas adding paragraphs of new text is an example of a non-minor edit.Sometimes while one user is editing, a second user saves an edit to the same part of the page. Then, when the first user attempts to save the page, an edit conflict occurs. The second user is then given an opportunity to merge his content into the page as it now exists following the first user's page save.MediaWiki's user interface has been localized in many different languages. A language for the wiki content itself can also be set, to be sent in the "Content-Language" HTTP header and "lang" HTML attribute.

Application programming interface

MediaWiki has an extensible web API (application programming interface) that provides direct, high-level access to the data contained in the MediaWiki databases. Client programs can use the API to log in, get data, and post changes. The API supports thin web-based JavaScript clients and end-user applications (such as vandal-fighting tools). The API can be accessed by the backend of another web site.WEB,weblink API, MediaWiki, May 17, 2010, 2010-05-30,weblink" title="web.archive.org/web/20100527004158weblink">weblink May 27, 2010, no, mdy-all, An extensive Python bot library, Pywikibot,WEB,weblink Pywikibot â€“ MediaWiki, www.mediawiki.org, 2018-03-16,weblink March 9, 2018, no, mdy-all, and a popular semi-automated tool called AutoWikiBrowser, also interface with the API.WEB, ÄŒesky,weblink Wikipedia:AutoWikiBrowser â€“ Wikipedia, the free encyclopedia, En.wikipedia.org, 2010-05-30,weblink" title="web.archive.org/web/20100420235103weblink">weblink April 20, 2010, no, mdy-all, The API is accessed via URLs such asweblink In this case, the query would be asking Wikipedia for information relating to the last 10 edits to the site. One of the perceived advantages of the API is its language independence; it listens for HTTP connections from clients and can send a response in a variety of formats, such as XML, serialized PHP, or JSON.{{citation|title=Facilitating Wiki/Repository Communication with Metadata|url=http://smartech.gatech.edu/dspace/handle/1853/28426|author1=Bartolo, Laura M.|author2=Lowe, Cathy S.|author3=Songar, Poonam|author4=Tandy, Robert J.|date=May 20, 2009|publisher=Georgia Institute of Technology|access-date=April 23, 2010|archive-url=https://web.archive.org/web/20110109004041weblink|archive-date=January 9, 2011|dead-url=no|df=mdy-all}} Client code has been developed to provide layers of abstraction to the API.WEB,weblink API:Client code, MediaWiki, May 24, 2010, 2010-05-30,weblink" title="web.archive.org/web/20100626072508weblink">weblink June 26, 2010, no, mdy-all,

Rich content

{{Update|section|date=March 2018|inaccurate=yes|reason=VisualEditor now exists and should be mentioned in the paragraph about WYSIWYG editors}}File:MediaWiki's gallery feature.png|thumb|300px|Images can be arranged in galleries, a feature that is used extensively for Wikimedia's media archive, Wikimedia CommonsWikimedia CommonsMediaWiki supports rich content generated through specialized syntax. For example, the software comes with optional support for rendering mathematical formulas using LaTeX and a special parser written in OCaml. Similar functionality for other content, ranging from graphical timelines over mathematical plotting and musical scores to Egyptian hieroglyphs, is available via extensions.The software has become more powerful at dealing with a wide variety of uploaded media files. Its richest functionality is in the area of images, where image galleries and thumbnails can be generated with relative ease. There is also support for Exif metadata. The use of MediaWiki to operate the Wikimedia Commons, one of the largest free content media archives, has driven the need for further functionality in this area.Because any WYSIWYG editor would have to know wikitext grammar, and no full grammar for wikitext exists, MediaWiki currently provides no native WYSIWYG support.WEB,weblink WYSIWYG editor, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20110501083511weblink">weblink May 1, 2011, no, mdy-all, It does come with a customizable graphical toolbar for simplifying the process of learning the wiki syntax.WEB,weblink Manual:FAQ, MediaWiki, May 21, 2010, 2010-05-30,weblink" title="web.archive.org/web/20110501083614weblink">weblink May 1, 2011, no, mdy-all, Various extensions exist for handling WYSIWYG editing to different degrees.WEB,weblink Category:WYSIWYG extensions, MediaWiki, April 10, 2008, 2010-05-30,weblink" title="web.archive.org/web/20110501083632weblink">weblink May 1, 2011, no, mdy-all,

Tracking edits

Among the features of MediaWiki to assist in tracking edits is a Recent Changes feature that provides a list of recent edits to the wiki. This list contains basic information about those edits such as the editing user, the edit summary, the page edited, as well as any tags (e.g. "possible malware link")WEB,weblink Tags â€“ Wikipedia, the free encyclopedia, En.wikipedia.org, 2010-05-30, added by customizable abuse filters and other extensions to aid in combating unhelpful edits.WEB,weblink Manual:Tags, MediaWiki, August 31, 2009, 2010-05-30,weblink" title="web.archive.org/web/20100625224408weblink">weblink June 25, 2010, no, mdy-all, On more active wikis, so many edits occur that it is hard to track Recent Changes manually. Anti-vandal software, including user-assisted toolsWEB,weblink Wikipedia:Huggle â€“ Wikipedia, the free encyclopedia, En.wikipedia.org, 2010-05-30,weblink" title="web.archive.org/web/20110331172521weblink">weblink March 31, 2011, no, mdy-all, are sometimes employed on such wikis to process Recent Changes items. Server load can be reduced by sending a continuous feed of Recent Changes to an IRC channel that these tools can monitor, eliminating their need to send requests for a refreshed Recent Changes feed to the API.WEB,weblink IRC/Channels â€“ Meta, Meta.wikimedia.org, 2010-05-30,weblink" title="web.archive.org/web/20100323020404weblink">weblink March 23, 2010, no, mdy-all, WEB,weblink Meet the 'bots' that edit Wikipedia, Daniel Nasaw, BBC News, July 25, 2012, July 30, 2012,weblink" title="web.archive.org/web/20120728024625weblink">weblink July 28, 2012, no, mdy-all, Another important tool is watchlisting. Each logged-in user has a watchlist to which the user can add whatever pages he or she wishes. When an edit is made to one of those pages, a summary of that edit appears on the watchlist the next time it is refreshed.WEB,weblink Manual:Watchlist, MediaWiki, November 24, 2009, 2010-05-30,weblink" title="web.archive.org/web/20110501081950weblink">weblink May 1, 2011, no, mdy-all, As with the recent changes page, recent edits that appear on the watchlist contain clickable links for easy review of the article history and specific changes made.There is also capability to review all edits made by any particular user. In this way, if an edit is identified as problematic, it is possible to check the user's other edits for issues.MediaWiki allows one to link to specific versions of articles. This has been useful to the scientific community, in that expert peer reviewers could analyse articles, improve them and provide links to the trusted version of that article.{{citation|title=Wiki ware could harness the Internet for science|author=Kevin Yager|journal=Nature|date=March 16, 2006|url=http://www.nature.com/nature/journal/v440/n7082/full/440278a.html|volume=440|doi=10.1038/440278a|pages=278|pmid=16541049|bibcode=2006Natur.440..278Y|access-date=April 29, 2010|archive-url=https://web.archive.org/web/20110513135539weblink|archive-date=May 13, 2011|dead-url=no|df=mdy-all}}

Navigation

Navigation through the wiki is largely through internal wikilinks. MediaWiki's wikilinks implement page existence detection, in which a link is colored blue if the target page exists on the local wiki and red if it does not. If a user clicks on a red link, they are prompted to create an article with that title. Page existence detection makes it practical for users to create "wikified" articles â€” that is, articles containing links to other pertinent subjects â€” without those other articles being yet in existence.
Interwiki links function much the same way as namespaces. A set of interwiki prefixes can be configured to cause, for instance, a page title of wikiquote:Jimbo Wales to direct the user to the Jimbo Wales article on Wikiquote.WEB,weblink Manual:Interwiki, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20101203112631weblink">weblink December 3, 2010, no, mdy-all, Unlike internal wikilinks, interwiki links lack page existence detection functionality, and accordingly there is no way to tell whether a blue interwiki link is broken or not.

Content organization

Page tabs and associated pages

(File:MediaWiki Vector skin tabs.png|frame|MediaWiki page tabs, using the "Vector" skin. The red coloration of the "discussion" tab indicates that the article does not yet have a talk page. As with any other red wikilink, clicking on it prompts the user to create the page.)Page tabs are displayed at the top of pages. These tabs allow users to perform actions or view pages that are related to the current page. The available default actions include viewing, editing, and discussing the current page. The specific tabs displayed depend on whether or not the user is logged into the wiki and whether the user has sysop privileges on the wiki. For instance, the ability to move a page or add it to one's watchlist is usually restricted to logged-in users. The site administrator can add or remove tabs by using JavaScript or installing extensions.WEB,weblink Help:Navigation, MediaWiki, May 21, 2010, 2010-05-30,weblink" title="web.archive.org/web/20100527004218weblink">weblink May 27, 2010, no, mdy-all, Each page has an associated history page from which the user can access every version of the page that has ever existed and generate diffs between two versions of his choice. Users' contributions are displayed not only here, but also via a "user contributions" option on a sidebar. Carl Challborn & Teresa Reimann note that "While this feature may be a slight deviation from the collaborative, 'ego-less' spirit of wiki purists, it can bevery useful for educators who need to assess the contribution and participation of individual student users."{{citation|url=http://cde.athabascau.ca/softeval/reports/R470412.pdf|title=Wiki products: a comparison|author1=Carl Challborn|author2=Teresa Reimann|lastauthoramp=yes|date=December 2004|publisher=Athabasca University|access-date=April 23, 2010|archive-url=https://web.archive.org/web/20101223221302weblink|archive-date=December 23, 2010|dead-url=no|df=mdy-all}}

{{anchor|Talk page|Namespace}} Namespaces

{{redirect|selfref=true|Talk page|talk pages on Wikipedia|Help:Talk pages}}MediaWiki provides many features beyond hyperlinks for structuring content. One of the earliest such features is namespaces. One of Wikipedia's earliest problems had been the separation of encyclopedic content from pages pertaining to maintenance and communal discussion, as well as personal pages about encyclopedia editors. Namespaces are prefixes before a page title (such as "User:" or "Talk:") that serve as descriptors for the page's purpose and allow multiple pages with different functions to exist under the same title. For instance, a page titled "{{brackets|The Terminator}}", in the default namespace, could describe the 1984 movie starring Arnold Schwarzenegger, while a page titled "{{brackets|User:The Terminator}}" could be a profile describing a user who chooses this name as a pseudonym. More commonly, each namespace has an associated "Talk:" namespace, which can be used to discuss its contents, such as "User talk:" or "Template talk:". The purpose of having discussion pages is to allow content to be separated from discussion surrounding the content.BOOK, Enterprise 2. 0 Implementation, Newman, Aaron, Adam Steinberg, and Jeremy Thomas, 185, McGraw-Hill Professional, 2008, 978-0-07-159160-7, BOOK, Multi-Stakeholder Governance and the Internet Governance Forum, Malcolm, Jeremy, 188, 280, Terminus Press, 2008, 978-0-9805084-0-6, Namespaces can be viewed as folders that separate different basic types of information or functionality. Custom namespaces can be added by the site administrators. There are 16 namespaces by default for content, with 2 "pseudo-namespaces" used for dynamically generated "Special:" pages and links to media files. Each namespace on MediaWiki is numbered: content page namespaces have even numbers and their associated talk page namespaces have odd numbers.BOOK, Wiki, Ebersbach, Anja, Markus Glaser, Richard Heigl, and Gunter Dueck, 55, 80–82, 109, 120–121, 156, Springer, 2006, 978-3-540-25995-4,

Category tags

Users can create new categories and add pages and files to those categories by appending one or more category tags to the content text. Adding these tags creates links at the bottom of the page that take the reader to the list of all pages in that category, making it easy to browse related articles.WEB,weblink Help:Categories, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20100625220958weblink">weblink June 25, 2010, no, mdy-all, The use of categorization to organize content has been described as a combination of:

Subpages

In addition to namespaces, content can be ordered using subpages. This simple feature provides automatic breadcrumbs of the pattern {{brackets|Page title/Subpage title}} from the page after the slash (in this case, "Subpage title") to the page before the slash (in this case, "Page title").

Customization

File:Popup-preview.png|thumb|300px|Users can configure custom JavaScriptJavaScriptIf the feature is enabled, users can customize their stylesheets and configure client-side JavaScript to be executed with every pageview. On Wikipedia, this has led to a large number of additional tools and helpers developed through the wiki and shared among users. For instance, navigation popups is a custom JavaScript tool that shows previews of articles when the user hovers over links, and also provides shortcuts for common maintenance tasks.WEB,weblink Wikipedia:Tools/Navigation popups, "Lupin",weblink" title="web.archive.org/web/20060718164504weblink">weblink July 18, 2006, no, mdy-all, File:Wikitime preview.jpg|thumb|300px|A screenshotscreenshotThe entire MediaWiki user interface can be edited through the wiki itself by users with the necessary permissions (typically called "administrators"). This is done through a special namespace with the prefix "MediaWiki:", where each page title identifies a particular user interface message. Using an extension,WEB,weblink Extension:Gadgets, MediaWiki, March 30, 2010, 2010-05-30,weblink" title="web.archive.org/web/20100625220327weblink">weblink June 25, 2010, no, mdy-all, it is also possible for a user to create personal scripts, and to choose whether certain sitewide scripts should apply to them by toggling the appropriate options in the user preferences page.

Templates

The "MediaWiki:" namespace was also originally used for creating custom text blocks that could then be dynamically loaded into other pages using a special syntax. This content was later moved into its own namespace, "Template:".Templates are text blocks that can be dynamically loaded inside another page whenever that page is requested. The template is a special link in double curly brackets (for example "{{Disputed|date=October 2018}}"), which calls the template (in this case located at ) to load in place of the template call.Templates are structured documents containing attribute–value pairs. They are defined with parameters, to which are assigned values when transcluded on an article page. The name of the parameter is delimited from the value by an equals sign. A class of templates known as infoboxes is used on Wikipedia to collect and present a subset of information about its subject, usually on the top (mobile view) or top right-hand corner (desktop view) of the document.A related method, called template substitution (called by adding subst: at the beginning of a template link) inserts (like a copy and paste operation) the contents of the template into the target page, instead of loading the template contents dynamically whenever the page is loaded. This can lead to inconsistency when using templates, but may be useful in certain cases, and in most cases requires fewer server resources (the actual amount of savings can vary depending on wiki configuration and the complexity of the template).Templates have found many different uses. Templates enable users to create complex table layouts that are used consistently across multiple pages, and where only the content of the tables gets inserted using template parameters. Templates are often used to identify problems with a Wikipedia article by putting a template in the article. This template then outputs a graphical box stating that the article content is disputed or in need of some other attention, and also categorize it so that articles of this nature can be located. Templates are also used on user pages to send users standard messages welcoming them to the site,WEB, ÄŒesky,weblink Template:Welcome â€“ Wikipedia, the free encyclopedia, En.wikipedia.org, May 16, 2010, 2010-05-30,weblink" title="web.archive.org/web/20110506003930weblink">weblink May 6, 2011, no, mdy-all, giving them awards for outstanding contributions,{{citation|title=Articulations of wikiwork: uncovering valued work in wikipedia through barnstars|url=http://portal.acm.org/citation.cfm?id=1460563.1460573|publisher=Proceedings of the ACM|author1=T Kriplean |author2=I Beschastnikh |year=2008|display-authors=etal}}WEB, ÄŒesky,weblink Wikipedia:Barnstars â€“ Wikipedia, the free encyclopedia, En.wikipedia.org, 2010-05-30,weblink" title="web.archive.org/web/20090624134612weblink">weblink June 24, 2009, no, mdy-all, warning them when their behavior is considered inappropriate,WEB, ÄŒesky,weblink Template:Test â€“ Wikipedia, the free encyclopedia, En.wikipedia.org, 2010-05-30,weblink" title="web.archive.org/web/20091111014442weblink">weblink November 11, 2009, no, mdy-all, notifying them when they are blocked from editing,WEB,weblink Template:Test5 â€“ Wikipedia, the free encyclopedia, En.wikipedia.org, June 19, 2008, 2010-05-30,weblink" title="web.archive.org/web/20090424005115weblink">weblink April 24, 2009, no, mdy-all, and so on.

Groups and restriction of access

MediaWiki offers flexibility in creating and defining user groups. For instance, it would be possible to create an arbitrary "ninja" group that can block users and delete pages, and whose edits are hidden by default in the recent changes log. It is also possible to set up a group of "autoconfirmed" users that one becomes a member of after making a certain number of edits and waiting a certain number of days.WEB,weblink Manual:User rights management, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20100625222112weblink">weblink June 25, 2010, no, mdy-all, Some groups that are enabled by default are bureaucrats and sysops. Bureaucrats have power to change other users' rights. Sysops have power over page protection and deletion and the blocking of users from editing. MediaWiki's available controls on editing rights have been deemed sufficient for publishing and maintaining important documents such as a manual of standard operating procedures in a hospital.{{citation|title=Operating Procedures in Clinical Practice|author1=H Zielke|author2=W Boemke|author3=M Kastrup|author4=C Melzer|publisher=Royal College of Anaesthetists|url=http://www.scata.org.uk/abstracts/2007_london/DelegateBookletSCATALondon2007.pdf|date=November 21, 2007|access-date=April 25, 2010|archive-url=https://web.archive.org/web/20110515020030weblink|archive-date=May 15, 2011|dead-url=no|df=mdy-all}}When a page consists only of useless content, there are several ways to remove that content. The simplest way, available to all users, is simply to blank the page. However, this interferes with page existence detection, unless an extension is installed to treat blanked pages as though they were nonexistent.WEB,weblink Extension:PureWikiDeletion, MediaWiki, May 26, 2010, 2010-05-30,weblink" title="web.archive.org/web/20110501083608weblink">weblink May 1, 2011, no, mdy-all, Blanking also leaves the content accessible through the history page, an outcome that, while potentially increasing transparency by allowing non-sysops to easily review the content removal decision for appropriateness, might be unacceptable or even unlawfulWEB,weblink Wikipedia:Village pump (proposals)/Persistent proposals/Straw poll for view-deleted â€“ Wikipedia, the free encyclopedia, En.wikipedia.org, 2010-05-30, in some cases. Another option is for a sysop to delete the page, and thereby prevent it from being viewed by non-sysops. Another level of deletion, called RevisionDelete, can be used by a group (e.g. "Oversighters") to prevent a page from being viewed by non-members of that group.WEB,weblink RevisionDelete, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20100626001201weblink">weblink June 26, 2010, no, mdy-all, It is also possible, using certain extensions, to remove content from being viewed through any of the normal channels on the wiki,WEB,weblink Extension:Oversight, MediaWiki, May 15, 2010, 2010-05-30,weblink" title="web.archive.org/web/20100625224255weblink">weblink June 25, 2010, no, mdy-all, or even to completely delete revisions from the database.WEB,weblink Extension:DeletePagePermanently, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20110501083447weblink">weblink May 1, 2011, no, mdy-all, MediaWiki comes with a basic set of features related to restricting access, but its original and ongoing design is driven by functions that largely relate to content, not content segregation. As a result, with minimal exceptions (related to specific tools and their related "Special" pages), page access control has never been a high priority in core development and developers have stated that users requiring secure user access and authorization controls should not rely on MediaWiki, since it was never designed for these kinds of situations. For instance, it is extremely difficult to create a wiki where only certain users can read and access some pages.WEB,weblink Security issues with authorization extensions, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20100626074354weblink">weblink June 26, 2010, no, mdy-all, Here, wiki engines like FosWiki, MoinMoin and Confluence provide more flexibility by supporting advanced security mechanisms like access control lists.

Extensibility

The MediaWiki codebase contains various "hooks" using callback functions to add additional PHP code in an extensible way. This allows developers to write extensions without necessarily needing to modify the core or having to submit their code for review. Installing an extension typically consists of adding a line to the configuration file, though in some cases additional changes such as database updates or core patches are required.Five main extension points were created to allow developers to add features and functionalities to MediaWiki. Hooks are run every time a certain event happens; for instance, the ArticleSaveComplete hook occurs after a save article request has been processed.WEB,weblink Manual:Hooks/ArticleSaveComplete, MediaWiki, May 26, 2010, 2010-05-30,weblink" title="web.archive.org/web/20141110145905weblink">weblink November 10, 2014, no, mdy-all, This can be used, for example, by an extension that notifies selected users whenever a page edit occurs on the wiki from new or anonymous users.WEB,weblink Extension:Recent Activity Notify, MediaWiki, 2010-05-30,weblink September 27, 2014, no, mdy-all, New tags can be created to process data with opening and closing tags (...).WEB,weblink Manual:Tag extensions, MediaWiki, May 21, 2010, 2010-05-30,weblink October 12, 2014, no, mdy-all, Parser functions can be used to create a new command ({{#if:...|...|...}}).WEB,weblink Manual:Parser functions, MediaWiki, March 22, 2010, 2010-05-30,weblink" title="web.archive.org/web/20141018103626weblink">weblink October 18, 2014, no, mdy-all, New special pages can be created to perform a specific function. These pages are dynamically generated. For example, a special page might show all pages that have one or more links to an external site or it might create a form providing user submitted feedback.WEB,weblink Manual:Special pages, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20141110162401weblink">weblink November 10, 2014, no, mdy-all, Skins allow users to customize the look and feel of MediaWiki.WEB,weblink Manual:Skins, MediaWiki, May 14, 2010, 2010-05-30,weblink" title="web.archive.org/web/20141125085917weblink">weblink November 25, 2014, no, mdy-all, A minor extension point allows the use of Amazon S3 to host image files.WEB,weblink Manual:Integration with S3, MediaWiki, March 22, 2010, 2010-05-30,weblink" title="web.archive.org/web/20141127084520weblink">weblink November 27, 2014, no, mdy-all,

Extensions

Resources to developers

MediaWiki can be made more advanced and useful for various purposes through its extensions. These extensions vary greatly in complexity.The Wikimedia Foundation operates a Git server where many extensions host their repository. Most of them also have a documentation page on the MediaWiki website.MediaWiki code review was itself historically facilitated through a MediaWiki extension.WEB,weblink Extension:CodeReview, MediaWiki, 2010-05-30,weblink September 26, 2014, no, mdy-all, As of March 2012, it has been done through Gerrit.Since version 1.16, MediaWiki uses the jQuery library.(:mw:jQuery|jQuery on MediaWiki)

Text manipulation

(File:Tim Starling June08.jpg|thumb|Tim Starling in 2008)Among the most popular extensions is a parser function extension, ParserFunctions, which allows different content to be rendered based on the result of conditional statements.WEB,weblink Extension:ParserFunctions, MediaWiki, December 25, 2009, 2010-05-30,weblink" title="web.archive.org/web/20100625222930weblink">weblink June 25, 2010, no, mdy-all, These conditional statements can perform functions such as evaluating whether a parameter is empty, comparing strings, evaluating mathematical expressions, and returning one of two values depending on whether a page exists. It was designed as a replacement for a notoriously inefficient template called {{Qif}}.WEB,weblink Wikipedia:Miscellany for deletion/Template:Qif â€“ Wikipedia, the free encyclopedia, En.wikipedia.org, 2010-05-30, Schindler recounts the history of the ParserFunctions extension as follows:{{cquote|In 2006 some Wikipedians discovered that through an intricate and complicated interplay of templating features and CSS they could create conditional wiki text, i.e. text that was displayed if a template parameter had a specific value. This included repeated calls of templates within templates, which bogged down the performance of the whole system. The developers faced the choice of either disallowing the spreading of an obviously desired feature by detecting such usage and explicitly disallowing it within the software, or offer an efficient alternative. The latter was done by Tim Starling, who announced the introduction of parser functions, wiki text that calls functions implemented in the underlying software.At first, only conditional text and the computation of simple mathematical expressions was implemented, but this already increased the possibilities for wiki editors enormously. With time further parser functions were introduced, finally leading to a framework that allowed the simple writing of extension function to add arbitrary functionalities, like e.g. geo-coding services or widgets. This time the developers were clearly reacting to the demand of the community, being forced either to fight the solution of the issue that the community had (i.e. conditional text), or offer an improved technical implementation to replace the previous practice and achieve an overall better performance.}}Another parser functions extension, StringFunctions, was developed to allow evaluation of string length, string position, and so on. Wikimedia communities, having created awkward workarounds to accomplish the same functionality,WEB,weblink Category:String manipulation templates â€“ Wikipedia, the free encyclopedia, En.wikipedia.org, May 15, 2010, 2010-05-30,weblink" title="web.archive.org/web/20110506003940weblink">weblink May 6, 2011, no, mdy-all, clamored for it to be enabled on their projects.WEB,weblink Bug 6455 – Enable StringFunctions on WMF wikis, bugzilla.wikimedia.org, October 9, 2010, Much of its functionality was eventually integrated into the ParserFunctions extension,WEB,weblink Extension:StringFunctions, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20100625221030weblink">weblink June 25, 2010, no, mdy-all, albeit disabled by default and accompanied by a warning from Tim Starling that enabling string functions would allow users "to implement their own parsers in the ugliest, most inefficient programming language known to man: MediaWiki wikitext with ParserFunctions."WEB,weblink r51497 â€“ Code Review, MediaWiki, 2010-05-30, Since 2012 an extension, Scribunto, has existed that allows for the creation of "modules" - wiki pages written in the scripting language Lua - which can then be run within templates and standard wiki pages. Scribunto has been installed on Wikipedia and other Wikimedia sites since 2013, and is used heavily on those sites. Scribunto code runs significantly faster than corresponding wikitext code using ParserFunctions.Lua performance

For footnotes and academic-related display

Another very popular extension is a citation extension that enables footnotes to be added to pages using inline references.WEB,weblink Extension:Cite, MediaWiki, May 3, 2010, 2010-05-30,weblink" title="web.archive.org/web/20141020220333weblink">weblink October 20, 2014, no, mdy-all, This extension has, however, been criticized for being difficult to use and requiring the user to memorize complex syntax. A gadget called RefToolbar attempts to make it easier to create citations using common templates. MediaWiki has some extensions that are well-suited for academia, such as mathematics extensionsWEB,weblink Category:Math extensions, MediaWiki, December 26, 2009, 2010-05-30,weblink" title="web.archive.org/web/20110501083222weblink">weblink May 1, 2011, no, mdy-all, and an extension that allows molecules to be rendered in 3D.{{citation|title=Wikido: Exploiting the Potential of Wikis|issue=50|date=January 2007|author=Marieke Guy|publisher=Ariadne|url=http://www.ariadne.ac.uk/issue50/wikido-rpt/|access-date=April 23, 2010|archive-url=https://web.archive.org/web/20100407170018weblink|archive-date=April 7, 2010|dead-url=no|df=mdy-all}}

Integration

A generic Widgets extension exists that allows MediaWiki to integrate with virtually anything. Other examples of extensions that could improve a wiki are category suggestion extensionsWEB,weblink Extension:CategorySuggest, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20140926005855weblink">weblink September 26, 2014, no, mdy-all, and extensions for inclusion of Flash Videos,WEB,weblink Category:Flash Video extensions, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20140915080226weblink">weblink September 15, 2014, no, mdy-all, YouTube videos,WEB,weblink Category:YouTube extensions, MediaWiki, September 16, 2008, 2010-05-30,weblink" title="web.archive.org/web/20110501083939weblink">weblink May 1, 2011, no, mdy-all, and RSS feeds.WEB,weblink Category:RSS extensions, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20101203095104weblink">weblink December 3, 2010, no, mdy-all, Metavid, a site that archives video footage of the U.S. Senate and House floor proceedings, was created using code extending MediaWiki into the domain of collaborative video authoring.{{citation|title=System demonstration: Metavid.org: a social website and open archive of congressional video|url=http://portal.acm.org/citation.cfm?id=1556176.1556232|publisher=Proceedings of the 10th Annual International Conference on Digital Government Research: Social Networks: Making Connections between Citizens, Data and Government|pages=309–310|isbn=978-1-60558-535-2|author1=M Dale |author2=A Stern |author3=M Deckert |author4=W Sack }}

Combating linkspam

There are many spambots that search the web for MediaWiki installations and add linkspam to them, despite the fact that MediaWiki uses the nofollow attribute to discourage such attempts at search engine optimization.WEB,weblink Wiki spam â€“ Meta, Meta.wikimedia.org, 2010-05-30,weblink November 7, 2014, no, mdy-all, Part of the problem is that third party republishers, such as mirrors, may not independently implement the nofollow tag on their websites, so marketers can still get PageRank benefit by inserting links into pages when those entries appear on third party websites.{{citation|title=Wikipedia's Labor Squeeze and its Consequences|publisher=Journal on Telecommunications and High Technology Law|author=Goldman, Eric|volume=8}} Anti-spam extensions have been developed to combat the problem by introducing CAPTCHAs,WEB,weblink Extension:ConfirmEdit, MediaWiki, May 5, 2010, 2010-05-30,weblink October 20, 2014, no, mdy-all, blacklisting certain URLs,WEB,weblink Extension:SpamBlacklist, MediaWiki, March 24, 2010, 2010-05-30,weblink" title="web.archive.org/web/20141020220337weblink">weblink October 20, 2014, no, mdy-all, and allowing bulk deletion of pages recently added by a particular user.WEB,weblink Extension:Nuke, MediaWiki, May 19, 2010, 2010-05-30,weblink October 20, 2014, no, mdy-all,

Searches and queries

MediaWiki comes pre-installed with a standard text-based search. Extensions exist to let MediaWiki use more sophisticated third-party search engines, including Elasticsearch (which since 2014 has been in use on Wikipedia), LuceneLucene-search MediaWiki extension {{Webarchive|url=https://web.archive.org/web/20120602042925weblink |date=June 2, 2012 }}, mediawiki.org and Sphinx.SphinxSearch MediaWiki extension {{Webarchive|url=https://web.archive.org/web/20141022092204weblink |date=October 22, 2014 }}, mediawiki.orgVarious MediaWiki extensions have also been created to allow for more complex, faceted search, on both data entered within the wiki and on metadata such as pages' revision history.{{citation|title=Search extension transforms Wiki into a relational system: A case for flavonoid metabolite database|pmc=2556319|author1=Masanori Arita |author2=Kazuhiro Suwa |lastauthoramp=yes |date=September 17, 2008|publisher=BioData Mining |pmid=18822113 |doi=10.1186/1756-0381-1-7 |volume=1 |journal=BioData Min |pages=7}}{{citation|title=Lost in localization: A solution with neuroinformatics 2.0?|author=Finn Årup Nielsen|date=August 11, 2009|publisher=NeuroImage|volume=48|issue=1}} Semantic MediaWiki is one such extension.{{citation|title=Collaborative Authoring of Learning Elements for Adaptive Learning Spaces|author1=Eric Ras|author2=Jörg Rech|author3=Sebastian Weber|publisher=Fifth International Conference on Adaptive Hypermedia and Adaptive Web-Based Systems|date=August 1, 2008|url=http://ah2008.l3s.uni-hannover.de/files/resourcesmodule/@random4875cb58f07c9/1215679368__Proc_AH2008_WS3_Authoring_of_Adaptive_and_Adaptable_Hypermedia.pdf#page=67|access-date=April 23, 2010|archive-url=https://web.archive.org/web/20110503215922weblink|archive-date=May 3, 2011|dead-url=no|df=mdy-all}}BOOK, 123, A Platform for Collaborative Management of Semantic Grid Metadata, Hartung, Michael, Intelligent distributed computing, systems and applications, etal,

Database

(File:MediaWiki database schema latest.svg|thumb|300px|A schematic of the MediaWiki database structure)MediaWiki can use either the MySQL/MariaDB, PostgreSQL or SQLite relational database management system. There is limited support for Oracle Database and Microsoft SQL Server.WEB,weblink Manual:Database access, MediaWiki, 2010-05-30,weblink September 25, 2014, no, mdy-all, A MediaWiki database contains several dozen tables, including a page table that contains page titles, page ids, and other metadata;WEB,weblink Manual:Page table, MediaWiki, May 15, 2010, 2010-05-30,weblink" title="web.archive.org/web/20141125051102weblink">weblink November 25, 2014, no, mdy-all, and a revision table to which is added a new row every time an edit is made, containing the page id, a brief textual summary of the change performed, the user name of the article editor (or its IP address the case of an unregistered user) and a timestamp.WEB,weblink Manual:Revision table, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20141124224756weblink">weblink November 24, 2014, no, mdy-all, {{citation|title=The Top-Ten Wikipedias: A Quantitative Analysis Using WikiXRay|author1=Ortega, Felipe |author2=González-Barahona, Jesus M. |author3=Robles, Gregorio |year=2007|citeseerx=10.1.1.107.1424 }}In a 4½ year period, the MediaWiki database had 170 schema versions.{{citation|title=Information Systems Integration and Evolution: Ontologies at Rescue|url=http://yellowstone.cs.ucla.edu/schema-evolution/documents/curino-STSM08-CR.pdf|author1=Curino, Carlo A.|author2=Tanca, Letizia|author3=Zaniolo, Carlo|year=2008|publisher=Workshop on Semantic|access-date=April 23, 2010|archive-url=https://web.archive.org/web/20091222052156weblink|archive-date=December 22, 2009|dead-url=no|df=mdy-all}} Possibly the largest schema change was done in MediaWiki 1.5, when the storage of metadata was separated from that of content, to improve performance flexibility. When this upgrade was applied to Wikipedia, the site was locked for editing, and the schema was converted to the new version in about 22 hours. Some software enhancement proposals, such as a proposal to allow sections of articles to be watched via watchlist, have been rejected because the necessary schema changes would have required excessive Wikipedia downtime.{{citation|title=No downtime for data conversions: Rethinking hot upgrades|url=http://www.pdl.cmu.edu/PDL-FTP/stray/CMU-PDL-09-106.pdf|author1=T Dumitras|author2=P Narasimhan|year=2009|access-date=April 29, 2010|archive-url=https://web.archive.org/web/20100616022532weblink|archive-date=June 16, 2010|dead-url=no|df=mdy-all}}

Performance and storage

Because it is used to run one of the highest-traffic sites on the Web, Wikipedia, MediaWiki's performance and scalability have been highly optimized. MediaWiki supports Squid, load-balanced database replication, client-side caching, memcached or table-based caching for frequently accessed processing of query results, a simple static file cache, feature-reduced operation, revision compression, and a job queue for database operations. MediaWiki developers have attempted to optimize the software by avoiding expensive algorithms, database queries, etc., caching every result that is expensive and has temporal locality of reference, and focusing on the hot spots in the code through profiling.{{citation|author=Bergsma, Mark|url=http://www.haute-disponibilite.net/wp-content/uploads/2008/06/wikimedia-architecture.pdf|title=Wikimedia Architecture|access-date=October 21, 2015|archive-url=https://web.archive.org/web/20160305000935weblink|archive-date=March 5, 2016|dead-url=no|df=mdy-all}}MediaWiki code is designed to allow for data to be written to a master database and read from slave databases, although the master can be used for some read operations if the slaves are not yet up to date. Metadata, such as article revision history, article relations (links, categories etc.), user accounts and settings can be stored in core databases and cached; the actual revision text, being more rarely used, can be stored as append-only blobs in external storage. The software is suitable for the operation of large scale wiki farms such as Wikimedia, which had about 800 wikis as of August 2011. However, MediaWiki comes with no built-in GUI to manage such installations.Empirical evidence shows most revisions in MediaWiki databases tend to differ only slightly from previous revisions. Therefore, subsequent revisions of an article can be concatenated and then compressed, achieving very high data compression ratios of up to 100x.For more information on the architecture, such as how it stores wikitext and assembles a page, see External links.

Limitations

The parser serves as the de facto standard for the MediaWiki syntax, as no formal syntax has been defined. Due to this lack of a formal definition, it has been difficult to create WYSIWYG editors for MediaWiki, although several WYSIWYG extensions do exist, including the popular VisualEditor.MediaWiki is not designed to be a suitable replacement for dedicated online forum or blogging software,WEB,weblink Manual:What is, MediaWiki, 2010-05-30,weblink July 22, 2018, no, mdy-all, although extensions do exist to allow for both of these.WEB,weblink Extension:StructuredDiscussions, MediaWiki, WEB,weblink Extension:Wikilog, MediaWiki, November 27, 2009, 2010-05-30,weblink September 22, 2014, no, mdy-all, It is common for new MediaWiki users to make certain mistakes, such as forgetting to sign posts with four tildes (~~~~),WEB,weblink Help:Signatures, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20081115143342weblink">weblink November 15, 2008, no, mdy-all, or manually entering a plaintext signature,{{citation|citeseerx = 10.1.1.133.1456|author1=N Augar |author2=R Raitman |author3=W Zhou |title=Teaching and learning online with wikis|publisher=Beyond the comfort zone|year=2004}} due to unfamiliarity with the idiosyncratic particulars involved in communication on MediaWiki discussion pages. On the other hand, the format of these discussion pages has been cited as a strength by one educator, who stated that it provides more fine-grain capabilities for discussion than traditional threaded discussion forums. For example, instead of 'replying' to an entire message, the participant in a discussion can create a hyperlink to a new wiki page on any word from the original page. Discussions are easier to follow since the content is available via hyperlinked wiki page, rather than a series of reply messages on a traditional threaded discussion forum. However, except in few cases, students were not using this capability, possibly because of their familiarity with the traditional linear discussion style and a lack of guidance on how to make the content more 'link-rich'.{{citation|title=Analysis of the use of Wiki-based collaborations in enhancing student learning|author=Cubric, Marija|publisher=University of Hertfordshire|year=2007|page=11|url=https://uhra.herts.ac.uk/dspace/handle/2299/3672|access-date=April 24, 2010|archive-url=https://web.archive.org/web/20110515005430weblink|archive-date=May 15, 2011|dead-url=yes|df=mdy-all}}MediaWiki by default has little support for the creation of dynamically assembled documents, or pages that aggregate data from other pages. Some research has been done on enabling such features directly within MediaWiki.{{citation|title=User defined structural searches in mediawiki|url=http://portal.acm.org/citation.cfm?id=1379099|publisher=Proceedings of the nineteenth ACM conference on Hypertext and hypermedia|isbn=978-1-59593-985-2|year=2008|author1=Albertsen, Johannes |author2=Bouvin, Niels Olof |lastauthoramp=yes }} The Semantic MediaWiki extension provides these features, but it is not in use on Wikipedia. The Wikibase Repository and Wikibase Repository client are however implemented in Wikidata and Pseudopedia respectively, and to some extent provides semantic web features, and linking of centrally stored data to infoboxes in various Wikipedia articles.Upgrading MediaWiki is usually fully automated, requiring no changes to the site content or template programming. Historically troubles have been encountered when upgrading from significantly older versions.{{citation|title=Toward upgrades-as-a-service in distributed systems|author1=T DumitraÅŸ |author2=P Narasimhan |publisher=Proceedings of the 10th ACM/IFIP/USENIX International Conference on Middleware|year=2009|url=http://portal.acm.org/citation.cfm?id=1657019}}

Security

MediaWiki developers have enacted security standards, both for core code and extensions.WEB,weblink Security for developers, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20141125053458weblink">weblink November 25, 2014, no, mdy-all, SQL queries and HTML output are usually done through wrapper functions that handle validation, escaping, filtering for prevention of cross-site scripting and SQL injection.{{citation|url=http://blogs.techrepublic.com/security/?p=451|title=Five security tips from MediaWiki's lead developer|author=Perrin, Chad|date=April 30, 2008|publisher=Tech Republic}} Many security issues have had to be patched after a MediaWiki version release,WEB,weblink News, MediaWiki, 2010-05-30,weblink" title="web.archive.org/web/20141006102554weblink">weblink October 6, 2014, no, mdy-all, and accordingly MediaWiki.org states, "The most important security step you can take is to keep your software up to date" by subscribing to the announcement listserv and installing security updates that are announced.WEB,weblink Manual:Security, MediaWiki, March 22, 2010, 2010-05-30,weblink" title="web.archive.org/web/20141110162807weblink">weblink November 10, 2014, no, mdy-all,

Developer community

MediaWiki developers are spread around the world, though with a majority in the United States and Europe. Face-to-face meetings and programming sessions for MediaWiki developers have been held once or several times a year since 2004.WEB,weblink Events, Mediawiki.org,

Support

Support for MediaWiki users consists of:
  • MediaWiki.org, including the .
  • An official mailing list, (mail:mediawiki-l|Mediawiki-l).
  • Several books have been written about MediaWiki administration,Books about MediaWiki, mediawiki.org including some free online books.BOOK,weblink MediaWiki Administrator's Handbook, Wikibooks, October 20, 2014,weblink October 20, 2014, no, mdy-all, {{citation|url=https://en.wikibooks.org/wiki/MediaWiki_User_Guide|publisher=Wikibooks|title=MediaWiki User Guide|access-date=October 20, 2014|archive-url=https://web.archive.org/web/20141020060147weblink|archive-date=October 20, 2014|dead-url=no|df=mdy-all}}

Comparison to other online collaboration software

Users of online collaboration software are familiar with MediaWiki's functions and layout due to its noted use on Wikipedia. Compared to other wikis, MediaWiki is also fairly aesthetically pleasing, though simple, and has an easily customized side menu and stylesheet.{{citation|title=Social Software in Academia|author=Bryant, Todd|publisher=Educause Quarterly|year=2006|url=http://net.educause.edu/ir/library/pdf/EQM0627.pdf|access-date=April 23, 2010|archive-url=https://web.archive.org/web/20091222054230weblink|archive-date=December 22, 2009|dead-url=no|df=mdy-all}} However, in one assessment in 2006, Confluence was deemed to be a superior product due to its very usable API and ability to better support multiple wikis. Wiki providers Socialtext and JotSpot have/had project management features that MediaWiki lacks.{{citation|author=Bean, L., & Hott, D. D.|date=July–August 2005|title=Wiki: A speedy new tool to manage projects|publisher=Journal of Corporate Accounting & Finance|pages=3–8}}A study was done at the University of Hong Kong comparing TWiki to MediaWiki. The authors noted that TWiki has been considered as a collaborative tool for development of educational papers and technical projects, whereas MediaWiki's most noted use is on Wikipedia. Although both platforms allow discussion and tracking of progress, TWiki has a "Report" part that MediaWiki lacks. Students perceived MediaWiki as being easier to use and more enjoyable than TWiki. When asked whether they recommended using MediaWiki for knowledge management course group project, 15 out of 16 respondents expressed their preference for MediaWiki giving answers of great certainty, such as "of course", "for sure".{{citation|url=http://www.edu.hku.hk/samchu/docs/2009_user_experiences.pdf |author=Liang, M., Chu, S., Siu, F., & Zhou, A. |date=Dec 3–4, 2009 |title=Comparing User Experiences in Using Twiki & Mediawiki to Facilitate Collaborative Learning |publisher=Proceedings of the 2009 International Conference on Knowledge Management |dead-url=yes |archiveurl=https://web.archive.org/web/20110514030607weblink |archivedate=May 14, 2011 }} TWiki and MediaWiki both have flexible plug-in architecture.{{citation|title=Company-Wiki as a knowledge transfer instrument for reducing the shortage of skilled workers|publisher=Institute of Technology and Education|author=Schulz, Judith|year=2009|url=http://elib.suub.uni-bremen.de/ip/docs/00010611.pdf|access-date=April 25, 2010|archive-url=https://web.archive.org/web/20160304092952weblink|archive-date=March 4, 2016|dead-url=no|df=mdy-all}}A study that compared students' experience with MediaWiki to that with Google Documents found that students gave the latter a much higher rating on user-friendly layout.{{citation|author=Chu, S., Kennedy, D., & Mak, M.|title=MediaWiki and Google Docs as online collaboration tools for group project co-construction|publisher=Proceedings of the 2009 International Conference on Knowledge Management|date=December 3–4, 2009|url=http://www.edu.hku.hk/samchu/docs/2009_mediawiki.pdf|access-date=April 23, 2010|archive-url=https://web.archive.org/web/20110514030658weblink|archive-date=May 14, 2011|dead-url=no|df=mdy-all}}

See also

References

{{reflist|colwidth=30em}}

External links

{{sisterlinks|d=Q83|c=Category:MediaWiki|mw=Manual:What is MediaWiki?|m=MediaWiki|voy=no|species=no|s=no|n=no}}
  • {{Official website|2=MediaWiki homepage}}, with , and .
  • {{DMOZ|Computers/Software/Groupware/Wiki/Wiki_Engines/PHP/|PHP wiki engines}}
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