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href="/w/index.php?title=Special:RecentChanges&feed=atom"> <link rel="dns-prefetch" href="//meta.wikimedia.org" /> <link rel="dns-prefetch" href="//login.wikimedia.org"> </head> <body class="ext-discussiontools-replytool-enabled ext-discussiontools-newtopictool-enabled ext-discussiontools-sourcemodetoolbar-enabled skin--responsive skin-vector skin-vector-search-vue mediawiki ltr sitedir-ltr mw-hide-empty-elt ns-12 ns-subject mw-editable page-Help_MediaSearch rootpage-Help_MediaSearch skin-vector-2022 action-view"><a class="mw-jump-link" href="#bodyContent">Jump to content</a> <div class="vector-header-container"> <header class="vector-header mw-header"> <div class="vector-header-start"> <nav class="vector-main-menu-landmark" aria-label="Site"> <div id="vector-main-menu-dropdown" class="vector-dropdown vector-main-menu-dropdown vector-button-flush-left vector-button-flush-right" > <input type="checkbox" id="vector-main-menu-dropdown-checkbox" role="button" aria-haspopup="true" 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href="/wiki/Special:MyLanguage/Category:Extensions"><span>Get extensions</span></a></li><li id="n-blog-text" class="mw-list-item"><a href="https://techblog.wikimedia.org/"><span>Tech blog</span></a></li><li id="n-mw-contribute" class="mw-list-item"><a href="/wiki/Special:MyLanguage/How_to_contribute"><span>Contribute</span></a></li> </ul> </div> </div> <div id="p-support" class="vector-menu mw-portlet mw-portlet-support" > <div class="vector-menu-heading"> Support </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-help" class="mw-list-item"><a href="/wiki/Special:MyLanguage/Help:Contents" title="The place to find out"><span>User help</span></a></li><li id="n-mw-faq" class="mw-list-item"><a href="/wiki/Special:MyLanguage/Manual:FAQ"><span>FAQ</span></a></li><li id="n-mw-manual" class="mw-list-item"><a href="/wiki/Special:MyLanguage/Manual:Contents"><span>Technical manual</span></a></li><li id="n-mw-supportdesk" class="mw-list-item"><a href="/wiki/Project:Support_desk"><span>Support desk</span></a></li><li id="n-mw-communication" class="mw-list-item"><a href="/wiki/Special:MyLanguage/Communication"><span>Communication</span></a></li> </ul> </div> </div> <div id="p-development" class="vector-menu mw-portlet mw-portlet-development" > <div class="vector-menu-heading"> Development </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-mw-developerportal" class="mw-list-item"><a href="https://developer.wikimedia.org/"><span>Developer portal</span></a></li><li id="n-svn-statistics" class="mw-list-item"><a href="/wiki/Development_statistics"><span>Code statistics</span></a></li> </ul> </div> </div> <div id="p-mediawiki.org" class="vector-menu mw-portlet mw-portlet-mediawiki_org" > <div class="vector-menu-heading"> mediawiki.org </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-portal" class="mw-list-item"><a href="/wiki/Project:Help" title="About the project, what you can do, where to find things"><span>Community portal</span></a></li><li id="n-recentchanges" class="mw-list-item"><a href="/wiki/Special:RecentChanges" title="A list of recent changes in the wiki [r]" accesskey="r"><span>Recent changes</span></a></li><li id="n-mw-translate" class="mw-list-item"><a href="/wiki/Special:LanguageStats"><span>Translate content</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Special:Random" title="Load a random page [x]" accesskey="x"><span>Random page</span></a></li><li id="n-mw-discussion" class="mw-list-item"><a href="/wiki/Project:Village_Pump"><span>Village pump</span></a></li><li id="n-Sandboxlink-portlet-label" class="mw-list-item"><a href="/wiki/Project:Sandbox"><span>Sandbox</span></a></li> </ul> </div> </div> <div id="p-lang" class="vector-menu mw-portlet mw-portlet-lang" > <div class="vector-menu-heading"> In other languages </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> 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cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Search MediaWiki [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Search</span> </a> <div class="vector-typeahead-search-container"> <div class="cdx-typeahead-search cdx-typeahead-search--show-thumbnail cdx-typeahead-search--auto-expand-width"> <form action="/w/index.php" id="searchform" class="cdx-search-input cdx-search-input--has-end-button"> <div id="simpleSearch" class="cdx-search-input__input-wrapper" data-search-loc="header-moved"> <div class="cdx-text-input cdx-text-input--has-start-icon"> <input class="cdx-text-input__input" type="search" name="search" placeholder="Search MediaWiki" aria-label="Search MediaWiki" autocapitalize="sentences" title="Search MediaWiki [f]" accesskey="f" id="searchInput" > <span class="cdx-text-input__icon cdx-text-input__start-icon"></span> </div> <input type="hidden" name="title" value="Special:Search"> </div> <button class="cdx-button cdx-search-input__end-button">Search</button> </form> </div> </div> </div> <nav class="vector-user-links vector-user-links-wide" aria-label="Personal tools"> <div class="vector-user-links-main"> <div id="p-vector-user-menu-preferences" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-uls" class="mw-list-item active user-links-collapsible-item"><a data-mw="interface" href="#" class="uls-trigger cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet"><span class="vector-icon mw-ui-icon-wikimedia-language mw-ui-icon-wikimedia-wikimedia-language"></span> <span>English</span></a> </li> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Appearance"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Change the appearance of the page's font size, width, and color" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Appearance" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-appearance mw-ui-icon-wikimedia-appearance"></span> <span class="vector-dropdown-label-text">Appearance</span> </label> <div class="vector-dropdown-content"> <div id="vector-appearance-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div id="p-vector-user-menu-notifications" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="https://donate.wikimedia.org/?utm_source=donate&utm_medium=sidebar&utm_campaign=spontaneous&uselang=en" class=""><span>Donate</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Special:CreateAccount&returnto=Help%3AMediaSearch" title="You are encouraged to create an account and log in; however, it is not mandatory" class=""><span>Create account</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Special:UserLogin&returnto=Help%3AMediaSearch" title="You are encouraged to log in; however, it is not mandatory [o]" accesskey="o" class=""><span>Log in</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="More options" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Personal tools" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Personal tools</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="User menu" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="https://donate.wikimedia.org/?utm_source=donate&utm_medium=sidebar&utm_campaign=spontaneous&uselang=en"><span>Donate</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:CreateAccount&returnto=Help%3AMediaSearch" title="You are encouraged to create an account and log in; however, it is not mandatory"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Create account</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:UserLogin&returnto=Help%3AMediaSearch" title="You are encouraged to log in; however, it is not mandatory [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Log in</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Pages for logged out editors <a href="/wiki/Help:Introduction" aria-label="Learn more about editing"><span>learn more</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Special:MyContributions" title="A list of edits made from this IP address [y]" accesskey="y"><span>Contributions</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Special:MyTalk" title="Discussion about edits from this IP address [n]" accesskey="n"><span>Talk</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Site"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Contents" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Contents</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">hide</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Beginning</div> </a> </li> <li id="toc-Full_text_search" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Full_text_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Full text search</span> </div> </a> <button aria-controls="toc-Full_text_search-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Full text search subsection</span> </button> <ul id="toc-Full_text_search-sublist" class="vector-toc-list"> <li id="toc-How" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#How"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>How</span> </div> </a> <ul id="toc-How-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Caveats" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Caveats"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>Caveats</span> </div> </a> <ul id="toc-Caveats-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Statements_and_structured_data" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Statements_and_structured_data"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Statements and structured data</span> </div> </a> <button aria-controls="toc-Statements_and_structured_data-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Statements and structured data subsection</span> </button> <ul id="toc-Statements_and_structured_data-sublist" class="vector-toc-list"> <li id="toc-How_2" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#How_2"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>How</span> </div> </a> <ul id="toc-How_2-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Caveats_2" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Caveats_2"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Caveats</span> </div> </a> <ul id="toc-Caveats_2-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div 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class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Help:MediaSearch&action=history"><span>View history</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> General </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Special:WhatLinksHere/Help:MediaSearch" title="A list of all wiki pages that link here [j]" accesskey="j"><span>What links here</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Special:RecentChangesLinked/Help:MediaSearch" rel="nofollow" title="Recent changes in pages linked from this page [k]" accesskey="k"><span>Related changes</span></a></li><li id="t-upload" class="mw-list-item"><a href="//commons.wikimedia.org/wiki/Special:UploadWizard" title="Upload files [u]" accesskey="u"><span>Upload file</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Special:SpecialPages" title="A list of all special pages [q]" accesskey="q"><span>Special pages</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Help:MediaSearch&oldid=6705372" title="Permanent link to this revision of this page"><span>Permanent link</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Help:MediaSearch&action=info" title="More information about this page"><span>Page information</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Special:UrlShortener&url=https%3A%2F%2Fwww.mediawiki.org%2Fwiki%2FHelp%3AMediaSearch"><span>Get shortened URL</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Special:QrCode&url=https%3A%2F%2Fwww.mediawiki.org%2Fwiki%2FHelp%3AMediaSearch"><span>Download QR code</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Print/export </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-create_a_book" class="mw-list-item"><a href="/w/index.php?title=Special:Book&bookcmd=book_creator&referer=Help%3AMediaSearch"><span>Create a book</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Special:DownloadAsPdf&page=Help%3AMediaSearch&action=show-download-screen"><span>Download as PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Help:MediaSearch&printable=yes" title="Printable version of this page [p]" accesskey="p"><span>Printable version</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> In other projects </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q111792508" title="Link to connected data repository item [g]" accesskey="g"><span>Wikidata item</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Appearance"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Appearance</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">hide</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div id="siteSub" class="noprint">From mediawiki.org</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-pt-translate-header noprint nomobile" dir="ltr" lang="en"><a href="/w/index.php?title=Special:Translate&group=page-Help%3AMediaSearch&action=page&filter=&action_source=translate_page" title="Special:Translate">Translate this page</a></div><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="mw-pt-languages noprint navigation-not-searchable" lang="en" dir="ltr"><div class="mw-pt-languages-label">Languages:</div><ul class="mw-pt-languages-list"><li><a href="/wiki/Help:MediaSearch/de" class="mw-pt-progress mw-pt-progress--complete" title="Help:MediaSearch (100% translated)" lang="de" dir="ltr">Deutsch</a></li> <li><span class="mw-pt-languages-ui mw-pt-languages-selected mw-pt-progress mw-pt-progress--complete" lang="en" dir="ltr">English</span></li> <li><a href="/wiki/Help:MediaSearch/fr" class="mw-pt-progress mw-pt-progress--low" title="Help:MediaSearch/fr (8% translated)" lang="fr" dir="ltr">français</a></li> <li><a href="/wiki/Help:MediaSearch/fi" class="mw-pt-progress mw-pt-progress--low" title="Ohje:MediaSearch (11% translated)" lang="fi" dir="ltr">suomi</a></li> <li><a href="/wiki/Help:MediaSearch/ja" class="mw-pt-progress mw-pt-progress--med" title="Help:MediaSearch (42% translated)" lang="ja" dir="ltr">日本語</a></li></ul></div> <p><a href="/wiki/Extension:MediaSearch" title="Extension:MediaSearch">MediaSearch</a> is a new search back and front end for finding files on Commons, where images appear in a shelf-like layout used by web image search engines. Feedback for MediaSearch can be left at <a href="https://commons.wikimedia.org/wiki/Commons_talk:Structured_data/Media_search" class="extiw" title="c:Commons talk:Structured data/Media search">the talk page on Commons</a>. </p><p>To maximize the chances of files being found with <a href="https://commons.wikimedia.org/wiki/Special:MediaSearch" class="extiw" title="c:Special:MediaSearch">Special:MediaSearch</a>: </p> <ul><li>Add a relevant and descriptive title</li> <li>Add relevant <a href="https://commons.wikimedia.org/wiki/Special:MyLanguage/Commons:File_captions" class="extiw" title="c:Special:MyLanguage/Commons:File captions">captions</a> in as many languages as possible, describing what the file is about</li> <li>Add a detailed description, describing what the file is about and any other relevant context</li> <li>Add the file to the relevant <a href="https://commons.wikimedia.org/wiki/Special:MyLanguage/Commons:Categories" class="extiw" title="c:Special:MyLanguage/Commons:Categories">categories</a></li> <li>Add all <a href="https://commons.wikimedia.org/wiki/Special:MyLanguage/Commons:Depicts" class="extiw" title="c:Special:MyLanguage/Commons:Depicts">depicts statements</a> that you think your file represents</li></ul> <p>Below is an overview of the kind of data that is used, and in what way it contributes to finding files. There are two main types of data used for finding files: </p> <ol><li>Full text</li> <li>Statements and structured data</li></ol> <meta property="mw:PageProp/toc"/> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Full_text_search" data-mw-thread-id="h-Full_text_search"><span data-mw-comment-start="" id="h-Full_text_search"></span>Full text search<span data-mw-comment-end="h-Full_text_search"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Help:MediaSearch&action=edit&section=1" title="Edit section: Full text search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="How" data-mw-thread-id="h-How-Full_text_search"><span data-mw-comment-start="" id="h-How-Full_text_search"></span>How<span data-mw-comment-end="h-How-Full_text_search"></span></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Help:MediaSearch&action=edit&section=2" title="Edit section: How"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>This is traditional <a href="/wiki/Special:MyLanguage/Help:CirrusSearch" title="Special:MyLanguage/Help:CirrusSearch">text-based search</a>: if text contains the words being searched for, the file matches. </p><p>The ranking is influenced in two ways: </p> <ul><li>Frequency of terms</li> <li>Position of terms</li></ul> <dl><dt>Frequency of terms</dt></dl> <p>The search algorithm will try to estimate how relevant a result is based on the frequency of the search terms. </p><p>The more often the search terms occur in <i>a document</i>, the <i>more relevant</i> it appears to be (for example: if one document mentions "Mona Lisa" more than another, it's likely more relevant). </p><p>The more often the search term occurs in <i>all documents</i>, the <i>less relevant</i> that term will be (for example: common words like "does" will not contribute much to the score because so many documents have that word). </p><p>For a "Mona Lisa" search term in wikitext on the English-language Wikipedia, this helps us discover that the "Mona Lisa" article (184 mentions of the term) is likely a better result than the "Louvre museum" article(7 occurrences.) </p><p>The problem that applies to Commons, however, is that this frequency often doesn't mean as much when it comes to comparing relevance: these are not long articles, but short descriptions. Terms tend to occur not more than once or twice and there is little other content to compare it against. That is why we also incorporate the position of terms into the ranking. </p> <dl><dt>Position of terms</dt></dl> <p>There are multiple ways to input information about a file. They each contribute to the final relevance score, but in a different way. </p><p><a href="/wiki/Special:MyLanguage/Wikitext" title="Special:MyLanguage/Wikitext">Wikitext</a> descriptions are historically considered most important in presenting file information, but they sometimes contain so much information that significant terms often don't stand out as much when it comes to search relevance. Alternatively, they sometimes contain very little information, which gives search little to work with to determine relevance. </p><p>For example, details like the author, the place or date that a media file was created, what museum it belongs to, or what license it is published under–while important–are often not the terms that people will search for. Furthermore, significant parts of a description are often "contextual" information, not pertaining directly to the main subject. </p><p>Also, while descriptions often contain a lot of information that can be very important in order to find the file, it can be hard to make out exactly what the file is about based on the terms in the description alone. Descriptions can be long (and even contain multiple languages and information that’s irrelevant to the search term). In other words, it is hard to determine relevance with descriptions. </p><p>Additional data that describes things in a more succinct way (such as titles, captions, categories) is often focused on highly specific information, which helps determine what's important in a media file–in other words, this data makes determining relevance easier. This is why the position of terms is important. </p><p>For example: when searching for "Mona Lisa," a file that contains "Mona Lisa" in the description alone will usually <i>be ranked lower in search results' than one that</i> also includes <i>that term as part of the title and/or caption, and/or is added to (one of) the Mona Lisa categories.</i> </p><p>However, note that duplicating information across fields in wikitext also may have the unintended consequence of lowering frequency-based relevance scores - so be sure to accurately describe the file by adding a relevant title, a detailed description, a caption (ideally in multiple languages), and the appropriate categories, without repeating the same information in multiple places. </p> <div class="mw-heading mw-heading3"><h3 id="Caveats" data-mw-thread-id="h-Caveats-Full_text_search"><span data-mw-comment-start="" id="h-Caveats-Full_text_search"></span>Caveats<span data-mw-comment-end="h-Caveats-Full_text_search"></span></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Help:MediaSearch&action=edit&section=3" title="Edit section: Caveats"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The aforementioned full-text search algorithm is very good, but has some issues as well - especially in our context: </p> <dl><dt>Language</dt></dl> <p>In a traditional text-based search, users likely don't want to see results in other languages than the one they are searching in (the assumption is that the user wouldn't understand other languages). That's different on Commons, because people are not really looking for the descriptions –they want the file. </p><p>So if a user searches for pictures of <i>cars</i>, ideally search would also find and return files that match in other languages, such as <i>auto</i> in Dutch or <i>voiture" in French. But unless every image's descriptions and/or captions have translations for every language, text-based search will not find results in other languages.</i> </p><p>An additional issue here is that while some words look the same in multiple languages, they may have different meanings. For example "gift" in English versus German, or "chat" in English as compared to French; these differences in language will return wildly different results in text-based search due to the change in meaning. </p> <dl><dt>Synonyms</dt></dl> <p>Similarly, when searching for a <i>bat</i> in text-based search, search will not find images where they're referred to by their scientific name: <i>Chiroptera</i>. This would also apply to acronyms, such as <i>NYC</i> when searching for <i>New York City</i>. </p> <dl><dt>Word matches, not concepts</dt></dl> <p>Similarly, a text description might contain a lot more implicit information that simply cannot be captured by scanning wikitext. </p><p>A <i>British shorthair</i> is also a <i>cat</i> and a <i>Volvo V40</i> is a <i>car</i>, but unless their descriptions also explicitly mention <i>cat</i> or <i>car</i>, they won't be found under those terms in a traditional text-based search. </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Statements_and_structured_data" data-mw-thread-id="h-Statements_and_structured_data"><span data-mw-comment-start="" id="h-Statements_and_structured_data"></span>Statements and structured data<span data-mw-comment-end="h-Statements_and_structured_data"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Help:MediaSearch&action=edit&section=4" title="Edit section: Statements and structured data"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="https://www.wikidata.org/wiki/Special:MyLanguage/Help:Statements" class="extiw" title="d:Special:MyLanguage/Help:Statements">Wikidata statements</a> have the potential of solving many of the aforementioned caveats of traditional text-based searches: they are multilingual, have aliases, and are linked to all sorts of related concepts. </p> <div class="mw-heading mw-heading3"><h3 id="How_2" data-mw-thread-id="h-How_2-Statements_and_structured_data"><span data-mw-comment-start="" id="h-How_2-Statements_and_structured_data"></span>How<span data-mw-comment-end="h-How_2-Statements_and_structured_data"></span></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Help:MediaSearch&action=edit&section=5" title="Edit section: How"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Since the addition of the "Structured data" tab on file pages, it has been possible to attach Wikidata entities to a file, including statements about what the file "depicts." </p><p>Given a search term (like "anaconda"), we'll also search Wikidata for relevant entities. In this case, here are some of the top results: </p> <ul><li>Anaconda (<a href="https://www.wikidata.org/wiki/Q483539" class="extiw" title="d:Q483539">Q483539</a>): town in Montana</li> <li><i>Eunectes</i> (<a href="https://www.wikidata.org/wiki/Q188622" class="extiw" title="d:Q188622">Q188622</a>): genus of snakes</li> <li>"Anaconda" (<a href="https://www.wikidata.org/wiki/Q17485058" class="extiw" title="d:Q17485058">Q17485058</a>): Nicki Minaj song</li></ul> <p>In addition to full text matching, search will also include results that have a "depicts" statement of (one or multiple of) these entities. It will also include results that have a "digital representation of" statement, used for artwork. </p><p>This has the potential of drastically expanding the amount of results returned, because entities already cover synonyms (via <a href="https://www.wikidata.org/wiki/Special:MyLanguage/Help:Aliases" class="extiw" title="d:Special:MyLanguage/Help:Aliases">Wikidata aliases</a>) and language differences (via <a href="https://www.wikidata.org/wiki/Special:MyLanguage/Help:Label" class="extiw" title="d:Special:MyLanguage/Help:Label">labels</a> & aliases in multiple languages): a file only needs to be tagged with one depicts statement per item, and search will be able to find that statement and any of its aliases or translations. </p><p>And when translations or aliases get added to those entities later on, files tagged with them will automatically benefit from it by now being discoverable under those terms as well. This is why it’s important to continue to enrich the entities added to depicts statements on Commons with more aliases, labels, and other information on Wikidata. </p><p><b>Note:</b> not all entities are considered equally in search ranking. When searching for "iris", users are likely expecting to find multimedia that depicts the genus of plants (<a href="https://www.wikidata.org/wiki/Q156901" class="extiw" title="d:Q156901">Q156901</a>), or maybe the part of an eye (<a href="https://www.wikidata.org/wiki/Q178748" class="extiw" title="d:Q178748">Q178748</a>), but probably not Iris Murdoch, the British writer and philosopher (<a href="https://www.wikidata.org/wiki/Q217495" class="extiw" title="d:Q217495">Q217495</a>). </p><p>Based on the similarity to the search term and the importance/popularity of the entity, Media Search will boost multimedia with certain entities more than others. </p> <div class="mw-heading mw-heading3"><h3 id="Caveats_2" data-mw-thread-id="h-Caveats_2-Statements_and_structured_data"><span data-mw-comment-start="" id="h-Caveats_2-Statements_and_structured_data"></span>Caveats<span data-mw-comment-end="h-Caveats_2-Statements_and_structured_data"></span></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Help:MediaSearch&action=edit&section=6" title="Edit section: Caveats"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Wikidata entities are an excellent signal to help discover additional relevant multimedia: </p> <ul><li>there is less noise (e.g. text descriptions often contain false-positives like "iris" being the first name of the photographer, not the subject of the file).</li> <li>they contain a lot more information (aliases & translations) than individual file descriptions ever can.</li> <li>they can be enriched in one central location (Wikidata)</li></ul> <p>But they are also a poor indicator for relative ranking: </p> <ul><li>In a file with multiple depicts statements, it's hard to know which statements are the most important or relevant</li> <li>Wikidata has many entities at varying levels of detail</li></ul> <dl><dt>Relative ranking</dt></dl> <p>In a file with multiple depicts statements, it's hard to know which statements are the most important or relevant. </p><p>Are both equally important, or is one of them the obvious subject and the other a less relevant background detail? If so, which? Is a depicts statement on one file more prominent than the same depicts statement on another? </p><p>Consider the "<a href="https://commons.wikimedia.org/wiki/Category:Pale_Blue_Dot" class="extiw" title="c:Category:Pale Blue Dot">Pale Blue Dot</a>" photographs: even though the earth makes up less than a pixel in the image set, it's a significant feature of the images. </p><p>Statements essentially only have two states: something is in the file, or it is not. There is no further detail about just how relevant something is in that file. </p><p>The “mark as prominent” feature for statements is provided to address some of these issues, but it is not currently being used consistently. Additionally, the use of qualifiers like 'applies to part' could help improve ranking, but those qualifiers are currently rarely used at all on Commons, though they have precedent on Wikidata. For example, on the Wikidata item for Mona Lisa, the depicted elements have 'applies to part' qualifiers that specify foreground or background, which could provide additional signals to the search ranking algorithm if used on Commons. </p><p>While depicts statements are tremendously useful in helping surface additional relevant results, it's hard to use them as a ranking signal: textual descriptions often convey the relative importance of subjects better than these simple statements can. </p> <dl><dt>Level of detail</dt></dl> <p>Wikidata has many entities at varying levels of detail. While we are currently working towards being able to include "child concepts" in search results, it’s important to be careful in the weight we give to certain entities, especially when compared to full text search. </p><p>For example, the statements bridge (<a href="https://www.wikidata.org/wiki/Q12280" class="extiw" title="d:Q12280">Q12280</a>), suspension bridge (<a href="https://www.wikidata.org/wiki/Q12570" class="extiw" title="d:Q12570">Q12570</a>), Golden Gate Bridge (<a href="https://www.wikidata.org/wiki/Q44440" class="extiw" title="d:Q44440">Q44440</a>) or tourist attraction (<a href="https://www.wikidata.org/wiki/Q570116" class="extiw" title="d:Q570116">Q570116</a>) could probably all be used to describe a picture of the Golden Gate Bridge, but the Golden Gate Bridge (<a href="https://www.wikidata.org/wiki/Q44440" class="extiw" title="d:Q44440">Q44440</a>) statement already implies all of the others via its various related entities. </p><p>However, there are examples where it's not this simple. </p><p>German Shepherd dog (<a href="https://www.wikidata.org/wiki/Q38280" class="extiw" title="d:Q38280">Q38280</a>) is a subclass of dog (<a href="https://www.wikidata.org/wiki/Q144" class="extiw" title="d:Q144">Q144</a>), which is a subclass of pet (<a href="https://www.wikidata.org/wiki/Q39201" class="extiw" title="d:Q39201">Q39201</a>) - in theory, we should be able to find pictures tagged with "German Shepherd dog" when one searches for "pet." </p><p>However, some photos tagged as "German Shepherd dog" likely depict working dogs (<a href="https://www.wikidata.org/wiki/Q1806324" class="extiw" title="d:Q1806324">Q1806324</a>), not pets. </p>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://www.mediawiki.org/w/index.php?title=Help:MediaSearch&oldid=6705372">https://www.mediawiki.org/w/index.php?title=Help:MediaSearch&oldid=6705372</a>"</div></div> <div id="catlinks" class="catlinks catlinks-allhidden" data-mw="interface"></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 19 August 2024, at 19:17.</li> <li id="footer-info-copyright">Text is available under the <a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-ShareAlike License</a>; additional terms may apply. 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