CINXE.COM

<!DOCTYPE html> <html class="client-nojs vector-feature-language-in-header-enabled vector-feature-language-in-main-page-header-disabled vector-feature-sticky-header-disabled vector-feature-page-tools-pinned-disabled vector-feature-toc-pinned-clientpref-1 vector-feature-main-menu-pinned-disabled vector-feature-limited-width-clientpref-1 vector-feature-limited-width-content-enabled vector-feature-custom-font-size-clientpref-1 vector-feature-appearance-pinned-clientpref-1 vector-feature-night-mode-enabled skin-theme-clientpref-day vector-toc-available" lang="en" dir="ltr"> <head> <meta charset="UTF-8"> <title>BASE (search engine) - Wikipedia</title> <script>(function(){var className="client-js vector-feature-language-in-header-enabled vector-feature-language-in-main-page-header-disabled vector-feature-sticky-header-disabled vector-feature-page-tools-pinned-disabled vector-feature-toc-pinned-clientpref-1 vector-feature-main-menu-pinned-disabled vector-feature-limited-width-clientpref-1 vector-feature-limited-width-content-enabled vector-feature-custom-font-size-clientpref-1 vector-feature-appearance-pinned-clientpref-1 vector-feature-night-mode-enabled skin-theme-clientpref-day vector-toc-available";var cookie=document.cookie.match(/(?:^|; )enwikimwclientpreferences=([^;]+)/);if(cookie){cookie[1].split('%2C').forEach(function(pref){className=className.replace(new RegExp('(^| )'+pref.replace(/-clientpref-\w+$|[^\w-]+/g,'')+'-clientpref-\\w+( |$)'),'$1'+pref+'$2');});}document.documentElement.className=className;}());RLCONF={"wgBreakFrames":false,"wgSeparatorTransformTable":["",""],"wgDigitTransformTable":["",""],"wgDefaultDateFormat":"dmy", "wgMonthNames":["","January","February","March","April","May","June","July","August","September","October","November","December"],"wgRequestId":"c2b86bdb-e4b1-4eb6-9467-73092002ae85","wgCanonicalNamespace":"","wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"BASE_(search_engine)","wgTitle":"BASE (search engine)","wgCurRevisionId":1208272959,"wgRevisionId":1208272959,"wgArticleId":11253805,"wgIsArticle":true,"wgIsRedirect":false,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgCategories":["Articles with short description","Short description matches Wikidata","Official website different in Wikidata and Wikipedia","Pages using interlanguage link with the wikidata parameter","Internet search engines","Open access (publishing)","Bibliographic databases and indexes","Scholarly search services"],"wgPageViewLanguage":"en","wgPageContentLanguage":"en","wgPageContentModel":"wikitext","wgRelevantPageName":"BASE_(search_engine)","wgRelevantArticleId":11253805, "wgIsProbablyEditable":true,"wgRelevantPageIsProbablyEditable":true,"wgRestrictionEdit":[],"wgRestrictionMove":[],"wgNoticeProject":"wikipedia","wgCiteReferencePreviewsActive":false,"wgFlaggedRevsParams":{"tags":{"status":{"levels":1}}},"wgMediaViewerOnClick":true,"wgMediaViewerEnabledByDefault":true,"wgPopupsFlags":0,"wgVisualEditor":{"pageLanguageCode":"en","pageLanguageDir":"ltr","pageVariantFallbacks":"en"},"wgMFDisplayWikibaseDescriptions":{"search":true,"watchlist":true,"tagline":false,"nearby":true},"wgWMESchemaEditAttemptStepOversample":false,"wgWMEPageLength":7000,"wgRelatedArticlesCompat":[],"wgCentralAuthMobileDomain":false,"wgEditSubmitButtonLabelPublish":true,"wgULSPosition":"interlanguage","wgULSisCompactLinksEnabled":false,"wgVector2022LanguageInHeader":true,"wgULSisLanguageSelectorEmpty":false,"wgWikibaseItemId":"Q448335","wgCheckUserClientHintsHeadersJsApi":["brands","architecture","bitness","fullVersionList","mobile","model","platform","platformVersion"], "GEHomepageSuggestedEditsEnableTopics":true,"wgGETopicsMatchModeEnabled":false,"wgGEStructuredTaskRejectionReasonTextInputEnabled":false,"wgGELevelingUpEnabledForUser":false};RLSTATE={"ext.globalCssJs.user.styles":"ready","site.styles":"ready","user.styles":"ready","ext.globalCssJs.user":"ready","user":"ready","user.options":"loading","ext.cite.styles":"ready","skins.vector.search.codex.styles":"ready","skins.vector.styles":"ready","skins.vector.icons":"ready","jquery.makeCollapsible.styles":"ready","ext.wikimediamessages.styles":"ready","ext.visualEditor.desktopArticleTarget.noscript":"ready","ext.uls.interlanguage":"ready","wikibase.client.init":"ready","ext.wikimediaBadges":"ready"};RLPAGEMODULES=["ext.cite.ux-enhancements","site","mediawiki.page.ready","jquery.makeCollapsible","mediawiki.toc","skins.vector.js","ext.centralNotice.geoIP","ext.centralNotice.startUp","ext.gadget.ReferenceTooltips","ext.gadget.switcher","ext.urlShortener.toolbar","ext.centralauth.centralautologin", "mmv.bootstrap","ext.popups","ext.visualEditor.desktopArticleTarget.init","ext.visualEditor.targetLoader","ext.echo.centralauth","ext.eventLogging","ext.wikimediaEvents","ext.navigationTiming","ext.uls.interface","ext.cx.eventlogging.campaigns","ext.cx.uls.quick.actions","wikibase.client.vector-2022","ext.checkUser.clientHints","ext.quicksurveys.init","ext.growthExperiments.SuggestedEditSession","wikibase.sidebar.tracking"];</script> <script>(RLQ=window.RLQ||[]).push(function(){mw.loader.impl(function(){return["user.options@12s5i",function($,jQuery,require,module){mw.user.tokens.set({"patrolToken":"+\\","watchToken":"+\\","csrfToken":"+\\"}); }];});});</script> <link rel="stylesheet" href="/w/load.php?lang=en&modules=ext.cite.styles%7Cext.uls.interlanguage%7Cext.visualEditor.desktopArticleTarget.noscript%7Cext.wikimediaBadges%7Cext.wikimediamessages.styles%7Cjquery.makeCollapsible.styles%7Cskins.vector.icons%2Cstyles%7Cskins.vector.search.codex.styles%7Cwikibase.client.init&only=styles&skin=vector-2022"> <script async="" src="/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022"></script> <meta name="ResourceLoaderDynamicStyles" content=""> <link rel="stylesheet" href="/w/load.php?lang=en&modules=site.styles&only=styles&skin=vector-2022"> <meta name="generator" content="MediaWiki 1.44.0-wmf.4"> <meta name="referrer" content="origin"> <meta name="referrer" content="origin-when-cross-origin"> <meta name="robots" content="max-image-preview:standard"> <meta name="format-detection" content="telephone=no"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/4/40/BASE_search_engine_logo.svg/1200px-BASE_search_engine_logo.svg.png"> <meta property="og:image:width" content="1200"> <meta property="og:image:height" content="675"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/4/40/BASE_search_engine_logo.svg/800px-BASE_search_engine_logo.svg.png"> <meta property="og:image:width" content="800"> <meta property="og:image:height" content="450"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/4/40/BASE_search_engine_logo.svg/640px-BASE_search_engine_logo.svg.png"> <meta property="og:image:width" content="640"> <meta property="og:image:height" content="360"> <meta name="viewport" content="width=1120"> <meta property="og:title" content="BASE (search engine) - Wikipedia"> <meta property="og:type" content="website"> <link rel="preconnect" href="//upload.wikimedia.org"> <link rel="alternate" media="only screen and (max-width: 640px)" href="//en.m.wikipedia.org/wiki/BASE_(search_engine)"> <link rel="alternate" type="application/x-wiki" title="Edit this page" href="/w/index.php?title=BASE_(search_engine)&action=edit"> <link rel="apple-touch-icon" href="/static/apple-touch/wikipedia.png"> <link rel="icon" href="/static/favicon/wikipedia.ico"> <link rel="search" type="application/opensearchdescription+xml" href="/w/rest.php/v1/search" title="Wikipedia (en)"> <link rel="EditURI" type="application/rsd+xml" href="//en.wikipedia.org/w/api.php?action=rsd"> <link rel="canonical" href="https://en.wikipedia.org/wiki/BASE_(search_engine)"> <link rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en"> <link rel="alternate" type="application/atom+xml" title="Wikipedia Atom feed" 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="skin--responsive skin-vector skin-vector-search-vue mediawiki ltr sitedir-ltr mw-hide-empty-elt ns-0 ns-subject mw-editable page-BASE_search_engine rootpage-BASE_search_engine 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" data-event-name="ui.dropdown-vector-main-menu-dropdown" class="vector-dropdown-checkbox " aria-label="Main menu" > <label id="vector-main-menu-dropdown-label" for="vector-main-menu-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-menu mw-ui-icon-wikimedia-menu"></span> <span class="vector-dropdown-label-text">Main menu</span> </label> <div class="vector-dropdown-content"> <div id="vector-main-menu-unpinned-container" class="vector-unpinned-container"> <div id="vector-main-menu" class="vector-main-menu vector-pinnable-element"> <div class="vector-pinnable-header vector-main-menu-pinnable-header vector-pinnable-header-unpinned" data-feature-name="main-menu-pinned" data-pinnable-element-id="vector-main-menu" data-pinned-container-id="vector-main-menu-pinned-container" data-unpinned-container-id="vector-main-menu-unpinned-container" > <div class="vector-pinnable-header-label">Main menu</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-main-menu.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-main-menu.unpin">hide</button> </div> <div id="p-navigation" class="vector-menu mw-portlet mw-portlet-navigation" > <div class="vector-menu-heading"> Navigation </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-mainpage-description" class="mw-list-item"><a href="/wiki/Main_Page" title="Visit the main page [z]" accesskey="z"><span>Main page</span></a></li><li id="n-contents" class="mw-list-item"><a href="/wiki/Wikipedia:Contents" title="Guides to browsing Wikipedia"><span>Contents</span></a></li><li id="n-currentevents" class="mw-list-item"><a href="/wiki/Portal:Current_events" title="Articles related to current events"><span>Current events</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Special:Random" title="Visit a randomly selected article [x]" accesskey="x"><span>Random article</span></a></li><li id="n-aboutsite" class="mw-list-item"><a href="/wiki/Wikipedia:About" title="Learn about Wikipedia and how it works"><span>About Wikipedia</span></a></li><li id="n-contactpage" class="mw-list-item"><a href="//en.wikipedia.org/wiki/Wikipedia:Contact_us" title="How to contact Wikipedia"><span>Contact us</span></a></li> </ul> </div> </div> <div id="p-interaction" class="vector-menu mw-portlet mw-portlet-interaction" > <div class="vector-menu-heading"> Contribute </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-help" class="mw-list-item"><a href="/wiki/Help:Contents" title="Guidance on how to use and edit Wikipedia"><span>Help</span></a></li><li id="n-introduction" class="mw-list-item"><a href="/wiki/Help:Introduction" title="Learn how to edit Wikipedia"><span>Learn to edit</span></a></li><li id="n-portal" class="mw-list-item"><a href="/wiki/Wikipedia:Community_portal" title="The hub for editors"><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 to Wikipedia [r]" accesskey="r"><span>Recent changes</span></a></li><li id="n-upload" class="mw-list-item"><a href="/wiki/Wikipedia:File_upload_wizard" title="Add images or other media for use on Wikipedia"><span>Upload file</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/Main_Page" class="mw-logo"> <img class="mw-logo-icon" src="/static/images/icons/wikipedia.png" alt="" aria-hidden="true" height="50" width="50"> <span class="mw-logo-container skin-invert"> <img class="mw-logo-wordmark" alt="Wikipedia" src="/static/images/mobile/copyright/wikipedia-wordmark-en.svg" style="width: 7.5em; height: 1.125em;"> <img class="mw-logo-tagline" alt="The Free Encyclopedia" src="/static/images/mobile/copyright/wikipedia-tagline-en.svg" width="117" height="13" style="width: 7.3125em; height: 0.8125em;"> </span> </a> </div> <div class="vector-header-end"> <div id="p-search" role="search" class="vector-search-box-vue vector-search-box-collapses vector-search-box-show-thumbnail vector-search-box-auto-expand-width vector-search-box"> <a href="/wiki/Special:Search" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Search Wikipedia [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 Wikipedia" aria-label="Search Wikipedia" autocapitalize="sentences" title="Search Wikipedia [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 emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </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/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_en.wikipedia.org&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=BASE+%28search+engine%29" 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=BASE+%28search+engine%29" title="You're encouraged to log in; however, it's 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="Log in and 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/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_en.wikipedia.org&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=BASE+%28search+engine%29" 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=BASE+%28search+engine%29" title="You're encouraged to log in; however, it's 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">(Top)</div> </a> </li> <li id="toc-History" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#History"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>History</span> </div> </a> <ul id="toc-History-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Functionality" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Functionality"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Functionality</span> </div> </a> <ul id="toc-Functionality-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Literature" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Literature"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Literature</span> </div> </a> <ul id="toc-Literature-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </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 id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">BASE (search engine)</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 5 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-5" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">5 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Bielefeld_Academic_Search_Engine" title="Bielefeld Academic Search Engine – German" lang="de" hreflang="de" data-title="Bielefeld Academic Search Engine" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/BASE" title="BASE – Spanish" lang="es" hreflang="es" data-title="BASE" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/BASE_(moteur_de_recherche)" title="BASE (moteur de recherche) – French" lang="fr" hreflang="fr" data-title="BASE (moteur de recherche)" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/BASE_(motore_di_ricerca)" title="BASE (motore di ricerca) – Italian" lang="it" hreflang="it" data-title="BASE (motore di ricerca)" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/BASE_(%D0%BF%D0%BE%D1%88%D1%83%D0%BA%D0%BE%D0%B2%D0%B8%D0%BA)" title="BASE (пошуковик) – Ukrainian" lang="uk" hreflang="uk" data-title="BASE (пошуковик)" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q448335#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/BASE_(search_engine)" title="View the content page [c]" accesskey="c"><span>Article</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Talk:BASE_(search_engine)" rel="discussion" title="Discuss improvements to the content page [t]" accesskey="t"><span>Talk</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Change language variant" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">English</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Views"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/BASE_(search_engine)"><span>Read</span></a></li><li id="ca-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=BASE_(search_engine)&action=edit" title="Edit this page [e]" accesskey="e"><span>Edit</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=BASE_(search_engine)&action=history" title="Past revisions of this page [h]" accesskey="h"><span>View history</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Tools" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Tools</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Tools</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">hide</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="More options" > <div class="vector-menu-heading"> Actions </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/BASE_(search_engine)"><span>Read</span></a></li><li id="ca-more-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=BASE_(search_engine)&action=edit" title="Edit this page [e]" accesskey="e"><span>Edit</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=BASE_(search_engine)&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/BASE_(search_engine)" title="List of all English Wikipedia pages containing links to this page [j]" accesskey="j"><span>What links here</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Special:RecentChangesLinked/BASE_(search_engine)" 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="/wiki/Wikipedia:File_Upload_Wizard" 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=BASE_(search_engine)&oldid=1208272959" 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=BASE_(search_engine)&action=info" title="More information about this page"><span>Page information</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Special:CiteThisPage&page=BASE_%28search_engine%29&id=1208272959&wpFormIdentifier=titleform" title="Information on how to cite this page"><span>Cite this page</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Special:UrlShortener&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FBASE_%28search_engine%29"><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%2Fen.wikipedia.org%2Fwiki%2FBASE_%28search_engine%29"><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-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Special:DownloadAsPdf&page=BASE_%28search_engine%29&action=show-download-screen" title="Download this page as a PDF file"><span>Download as PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=BASE_(search_engine)&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 class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:Bielefeld_Academic_Search_Engine" hreflang="en"><span>Wikimedia Commons</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q448335" title="Structured data on this page hosted by Wikidata [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 class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Academic search engine</div> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox vcard"><caption class="infobox-title fn org">BASE (Bielefeld Academic Search Engine)</caption><tbody><tr><td colspan="2" class="infobox-image"><figure class="mw-halign-center" typeof="mw:File"><a href="/wiki/File:BASE_search_engine_logo.svg" class="mw-file-description" title="Logo"><img alt="Logo" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/40/BASE_search_engine_logo.svg/160px-BASE_search_engine_logo.svg.png" decoding="async" width="160" height="90" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/40/BASE_search_engine_logo.svg/240px-BASE_search_engine_logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/40/BASE_search_engine_logo.svg/320px-BASE_search_engine_logo.svg.png 2x" data-file-width="1006" data-file-height="566" /></a><figcaption>Logo</figcaption></figure></td></tr><tr><td colspan="2" class="infobox-image"><span typeof="mw:File"><a href="/wiki/File:Universit%C3%A4t_Bielefeld_Luftaufnahme_Juni_2022.jpg" class="mw-file-description" title="Universität_Bielefeld_Luftaufnahme_Juni_2022"><img alt="Universität_Bielefeld_Luftaufnahme_Juni_2022" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7c/Universit%C3%A4t_Bielefeld_Luftaufnahme_Juni_2022.jpg/225px-Universit%C3%A4t_Bielefeld_Luftaufnahme_Juni_2022.jpg" decoding="async" width="225" height="127" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7c/Universit%C3%A4t_Bielefeld_Luftaufnahme_Juni_2022.jpg/338px-Universit%C3%A4t_Bielefeld_Luftaufnahme_Juni_2022.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7c/Universit%C3%A4t_Bielefeld_Luftaufnahme_Juni_2022.jpg/450px-Universit%C3%A4t_Bielefeld_Luftaufnahme_Juni_2022.jpg 2x" data-file-width="4000" data-file-height="2250" /></a></span><div class="infobox-caption">Aerial view of Bielefeld University with recognizable construction progress at the new main entrance from June 15th, 2022</div></td></tr><tr><th scope="row" class="infobox-label"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">Type of site</div></th><td class="infobox-data">Academic <a href="/wiki/Internet_search_engine" class="mw-redirect" title="Internet search engine">Internet search engine</a></td></tr><tr><th scope="row" class="infobox-label">Available in</th><td class="infobox-data">Chinese (simplified), German, English, French, Spanish (Castilian), Polish, Greek, Ukrainian</td></tr><tr><th scope="row" class="infobox-label">Area served</th><td class="infobox-data">Worldwide</td></tr><tr><th scope="row" class="infobox-label">Owner</th><td class="infobox-data"><a href="/wiki/Bielefeld_University" title="Bielefeld University">Bielefeld University</a> Library</td></tr><tr><th scope="row" class="infobox-label">URL</th><td class="infobox-data url"><span class="url"><a rel="nofollow" class="external text" href="https://www.base-search.net">www<wbr />.base-search<wbr />.net</a></span></td></tr><tr><th scope="row" class="infobox-label">Commercial</th><td class="infobox-data">No</td></tr><tr><th scope="row" class="infobox-label">Registration</th><td class="infobox-data">Optional</td></tr><tr><th scope="row" class="infobox-label">Launched</th><td class="infobox-data">June 24, 2004<span class="noprint">; 20 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">2004-06-24</span>)</span></td></tr><tr><th scope="row" class="infobox-label">Current status</th><td class="infobox-data category">Active</td></tr></tbody></table> <p><b>BASE</b> (<b>Bielefeld Academic Search Engine</b>) is a multi-disciplinary <a href="/wiki/Search_engine" title="Search engine">search engine</a> to scholarly internet resources, created by <a href="/wiki/Bielefeld_University" title="Bielefeld University">Bielefeld University</a> Library in <a href="/wiki/Bielefeld" title="Bielefeld">Bielefeld</a>, <a href="/wiki/Germany" title="Germany">Germany</a>. It is based on <a href="/wiki/Free_and_open-source_software" title="Free and open-source software">free and open-source software</a> such as <a href="/wiki/Apache_Solr" title="Apache Solr">Apache Solr</a> and <a href="/wiki/VuFind" title="VuFind">VuFind</a>.<sup id="cite_ref-migration2011_1-0" class="reference"><a href="#cite_note-migration2011-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> It <a href="/wiki/Web_harvesting" class="mw-redirect" title="Web harvesting">harvests</a> OAI metadata from <a href="/wiki/Institutional_repository" title="Institutional repository">institutional repositories</a> and other academic <a href="/wiki/Digital_library" title="Digital library">digital libraries</a> that implement the <a href="/wiki/Open_Archives_Initiative_Protocol_for_Metadata_Harvesting" title="Open Archives Initiative Protocol for Metadata Harvesting">Open Archives Initiative Protocol for Metadata Harvesting</a> (OAI-PMH), and then normalizes and <a href="/wiki/Index_(search_engine)" class="mw-redirect" title="Index (search engine)">indexes</a> the data for searching. In addition to OAI <a href="/wiki/Metadata" title="Metadata">metadata</a>, the library indexes selected web sites and local data collections, all of which can be searched via a single search interface. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=BASE_(search_engine)&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>BASE was developed at the German <a href="/wiki/Bielefeld_University" title="Bielefeld University">university of Bielefeld</a> beginning in 2002. The project's initial goal was to develop a search engine that would provide users access to the university's research resources. Yet as the initiative advanced, the creators came to see the need for a more thorough search engine that might provide users access to academic resources outside of the university. </p><p>The initial iteration of BASE was released as a prototype in 2004 and made accessible to the general public for testing. The search engine was created to index and offer access to scholarly materials such journals, institutional repositories, and digital collections as well as scientific publications. The search engine's creators emphasized on ensuring open access to scientific knowledge and made sure that its search results only included materials that were publicly available through the web.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>Over the next few years, BASE continued to grow and develop. The search engine was refined and improved, and it began to attract users from all over the world. In 2007, the project received funding from the <a href="/wiki/German_Research_Foundation" title="German Research Foundation">German Research Foundation</a> (DFG) to further develop and improve the search engine. </p><p>Since then, BASE has become one of the largest and most comprehensive search engines for academic resources. It provides access to scholarly resources in a variety of languages and disciplines, and it has become an important tool for researchers, scholars, and students around the world. </p><p>In addition to providing access to scholarly resources, BASE has also been involved in several projects and initiatives aimed at promoting open access and improving scholarly communication. For example, the search engine has been involved in the development of the <a href="/wiki/Open_Archives_Initiative_Protocol_for_Metadata_Harvesting" title="Open Archives Initiative Protocol for Metadata Harvesting">Open Archives Initiative Protocol</a> for Metadata Harvesting (OAI-PMH), which is used to facilitate the exchange of metadata between digital repositories. </p><p>Overall, BASE has played an important role in the development of open access and the democratization of knowledge. Its commitment to providing free and open access to scholarly resources has made it an important resource for researchers and scholars around the world. </p> <div class="mw-heading mw-heading2"><h2 id="Functionality">Functionality</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=BASE_(search_engine)&action=edit&section=2" title="Edit section: Functionality"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Users can search bibliographic metadata including abstracts, if available. However, BASE does not currently offer <a href="/wiki/Full_text_search" class="mw-redirect" title="Full text search">full text search</a>. It contrasts with commercial search engines in multiple ways, including in the types and kinds of resources it searches and the information it offers about the results it finds. Results can be narrowed down using drill down menus (<a href="/wiki/Faceted_search" title="Faceted search">faceted search</a>). <a href="/wiki/Bibliographic_database" title="Bibliographic database">Bibliographic data</a> is provided in several formats, and the results may be sorted by multiple fields, such as by author or year of publication. </p><p>Paying customers include <a href="/wiki/EBSCO_Information_Services" title="EBSCO Information Services">EBSCO Information Services</a> who integrated BASE into their EBSCO Discovery Service (EDS).<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Non-commercial services can integrate BASE search for free using an <a href="/wiki/Application_programming_interface" class="mw-redirect" title="Application programming interface">API</a>. BASE becomes an increasingly important component of <a href="/wiki/Open_access" title="Open access">open access</a> initiatives concerned with enhancing the visibility of their digital archive collections.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>On 6 October 2016, BASE surpassed the 100 million documents threshold having indexed 100,183,705 documents from 4,695 content sources. As of 2022, it had indexed over 315 million documents from over 10,000 sources.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=BASE_(search_engine)&action=edit&section=3" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/List_of_academic_databases_and_search_engines" title="List of academic databases and search engines">List of academic databases and search engines</a></li> <li><a href="/wiki/CORE_(research_service)" title="CORE (research service)">CORE (research service)</a></li> <li><a href="/wiki/Open_access_in_Germany" title="Open access in Germany">Open access in Germany</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=BASE_(search_engine)&action=edit&section=4" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-migration2011-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-migration2011_1-0">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFPieper2011" class="citation web cs1">Pieper, Dirk (May 18, 2011). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20121021215552/http://www.ub.uni-dortmund.de/listen/inetbib/msg44882.html">"BASE Migration"</a>. InetBib. Archived from <a rel="nofollow" class="external text" href="http://www.ub.uni-dortmund.de/listen/inetbib/msg44882.html">the original</a> on October 21, 2012<span class="reference-accessdate">. Retrieved <span class="nowrap">August 27,</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=BASE+Migration&rft.pub=InetBib&rft.date=2011-05-18&rft.aulast=Pieper&rft.aufirst=Dirk&rft_id=http%3A%2F%2Fwww.ub.uni-dortmund.de%2Flisten%2Finetbib%2Fmsg44882.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ABASE+%28search+engine%29" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPieper_and_Summann2006" class="citation web cs1">Pieper and Summann, Dirk and Friedrich (October 2006). <a rel="nofollow" class="external text" href="https://www.researchgate.net/publication/28806353">"Bielefeld Academic Search Engine (BASE) An end-user oriented institutional repository search service"</a>. <i>ResearchGate</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=ResearchGate&rft.atitle=Bielefeld+Academic+Search+Engine+%28BASE%29+An+end-user+oriented+institutional+repository+search+service&rft.date=2006-10&rft.aulast=Pieper+and+Summann&rft.aufirst=Dirk+and+Friedrich&rft_id=https%3A%2F%2Fwww.researchgate.net%2Fpublication%2F28806353&rfr_id=info%3Asid%2Fen.wikipedia.org%3ABASE+%28search+engine%29" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPrice2015" class="citation web cs1">Price, Gary (December 7, 2015). <a rel="nofollow" class="external text" href="http://www.infodocket.com/2015/12/07/content-from-bielefeld-universitys-base-database-now-searchable-in-ebsco-discovery-service/">"Content from Bielefeld University's BASE Database Now Searchable in EBSCO Discovery Service"</a>. Library Journal INFOdocket<span class="reference-accessdate">. Retrieved <span class="nowrap">July 10,</span> 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Content+from+Bielefeld+University%27s+BASE+Database+Now+Searchable+in+EBSCO+Discovery+Service&rft.pub=Library+Journal+INFOdocket&rft.date=2015-12-07&rft.aulast=Price&rft.aufirst=Gary&rft_id=http%3A%2F%2Fwww.infodocket.com%2F2015%2F12%2F07%2Fcontent-from-bielefeld-universitys-base-database-now-searchable-in-ebsco-discovery-service%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3ABASE+%28search+engine%29" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFLochman2017" class="citation web cs1">Lochman, Martin (March 23, 2017). <a rel="nofollow" class="external text" href="http://openscience.com/open-archives-initiative-service-providers-enhancing-the-visibility-of-research-in-malta/">"Open Archives Initiative service providers: Enhancing the visibility of research in Malta"</a>. <i>OpenScience.com</i><span class="reference-accessdate">. Retrieved <span class="nowrap">April 13,</span> 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=OpenScience.com&rft.atitle=Open+Archives+Initiative+service+providers%3A+Enhancing+the+visibility+of+research+in+Malta&rft.date=2017-03-23&rft.aulast=Lochman&rft.aufirst=Martin&rft_id=http%3A%2F%2Fopenscience.com%2Fopen-archives-initiative-service-providers-enhancing-the-visibility-of-research-in-malta%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3ABASE+%28search+engine%29" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.base-search.net/about/en/about_statistics.php">"BASE - Bielefeld Academic Search Engine | Statistics"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=BASE+-+Bielefeld+Academic+Search+Engine+%26%23124%3B+Statistics&rft_id=https%3A%2F%2Fwww.base-search.net%2Fabout%2Fen%2Fabout_statistics.php&rfr_id=info%3Asid%2Fen.wikipedia.org%3ABASE+%28search+engine%29" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="Literature">Literature</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=BASE_(search_engine)&action=edit&section=5" title="Edit section: Literature"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Lossau, Norbert. 2004. "Search Engine Technology and Digital Libraries: Libraries Need to Discover the Academic Internet," D-Lib Magazine, Volume 10, Number 6, June 2004. <a href="//doi.org/10.1045/june2004-lossau" class="extiw" title="doi:10.1045/june2004-lossau">doi:10.1045/june2004-lossau</a></li> <li>Summann, Friedrich and Norbert Lossau. 2004. "Search Engine Technology and Digital Libraries: Moving from Theory to Practice," D-Lib Magazine, Volume 10, Number 9, September 2004. <a href="//doi.org/10.1045/september2004-lossau" class="extiw" title="doi:10.1045/september2004-lossau">doi:10.1045/september2004-lossau</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=BASE_(search_engine)&action=edit&section=6" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="official-website"><span class="url"><a rel="nofollow" class="external text" href="http://www.base-search.net">Official website</a></span></span></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist .mw-empty-li{display:none}.mw-parser-output .hlist dt::after{content:": "}.mw-parser-output .hlist dd::after,.mw-parser-output .hlist li::after{content:" · ";font-weight:bold}.mw-parser-output .hlist dd:last-child::after,.mw-parser-output .hlist dt:last-child::after,.mw-parser-output .hlist li:last-child::after{content:none}.mw-parser-output .hlist dd dd:first-child::before,.mw-parser-output .hlist dd dt:first-child::before,.mw-parser-output .hlist dd li:first-child::before,.mw-parser-output .hlist dt dd:first-child::before,.mw-parser-output .hlist dt dt:first-child::before,.mw-parser-output .hlist dt li:first-child::before,.mw-parser-output .hlist li dd:first-child::before,.mw-parser-output .hlist li dt:first-child::before,.mw-parser-output .hlist li li:first-child::before{content:" (";font-weight:normal}.mw-parser-output .hlist dd dd:last-child::after,.mw-parser-output .hlist dd dt:last-child::after,.mw-parser-output .hlist dd li:last-child::after,.mw-parser-output .hlist dt dd:last-child::after,.mw-parser-output .hlist dt dt:last-child::after,.mw-parser-output .hlist dt li:last-child::after,.mw-parser-output .hlist li dd:last-child::after,.mw-parser-output .hlist li dt:last-child::after,.mw-parser-output .hlist li li:last-child::after{content:")";font-weight:normal}.mw-parser-output .hlist ol{counter-reset:listitem}.mw-parser-output .hlist ol>li{counter-increment:listitem}.mw-parser-output .hlist ol>li::before{content:" "counter(listitem)"\a0 "}.mw-parser-output .hlist dd ol>li:first-child::before,.mw-parser-output .hlist dt ol>li:first-child::before,.mw-parser-output .hlist li ol>li:first-child::before{content:" ("counter(listitem)"\a0 "}</style><style data-mw-deduplicate="TemplateStyles:r1236075235">.mw-parser-output .navbox{box-sizing:border-box;border:1px solid #a2a9b1;width:100%;clear:both;font-size:88%;text-align:center;padding:1px;margin:1em auto 0}.mw-parser-output .navbox .navbox{margin-top:0}.mw-parser-output .navbox+.navbox,.mw-parser-output .navbox+.navbox-styles+.navbox{margin-top:-1px}.mw-parser-output .navbox-inner,.mw-parser-output .navbox-subgroup{width:100%}.mw-parser-output .navbox-group,.mw-parser-output .navbox-title,.mw-parser-output .navbox-abovebelow{padding:0.25em 1em;line-height:1.5em;text-align:center}.mw-parser-output .navbox-group{white-space:nowrap;text-align:right}.mw-parser-output .navbox,.mw-parser-output .navbox-subgroup{background-color:#fdfdfd}.mw-parser-output .navbox-list{line-height:1.5em;border-color:#fdfdfd}.mw-parser-output .navbox-list-with-group{text-align:left;border-left-width:2px;border-left-style:solid}.mw-parser-output tr+tr>.navbox-abovebelow,.mw-parser-output tr+tr>.navbox-group,.mw-parser-output tr+tr>.navbox-image,.mw-parser-output tr+tr>.navbox-list{border-top:2px solid #fdfdfd}.mw-parser-output .navbox-title{background-color:#ccf}.mw-parser-output .navbox-abovebelow,.mw-parser-output .navbox-group,.mw-parser-output .navbox-subgroup .navbox-title{background-color:#ddf}.mw-parser-output .navbox-subgroup .navbox-group,.mw-parser-output .navbox-subgroup .navbox-abovebelow{background-color:#e6e6ff}.mw-parser-output .navbox-even{background-color:#f7f7f7}.mw-parser-output .navbox-odd{background-color:transparent}.mw-parser-output .navbox .hlist td dl,.mw-parser-output .navbox .hlist td ol,.mw-parser-output .navbox .hlist td ul,.mw-parser-output .navbox td.hlist dl,.mw-parser-output .navbox td.hlist ol,.mw-parser-output .navbox td.hlist ul{padding:0.125em 0}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em}body.skin--responsive .mw-parser-output .navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="Open_access" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Open_access_navbox" title="Template:Open access navbox"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Open_access_navbox" title="Template talk:Open access navbox"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Open_access_navbox" title="Special:EditPage/Template:Open access navbox"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Open_access" style="font-size:114%;margin:0 4em"><a href="/wiki/Open_access" title="Open access">Open access</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><a href="/wiki/History_of_open_access" title="History of open access">History</a></li> <li><a href="/wiki/Timeline_of_the_open-access_movement" title="Timeline of the open-access movement">Timeline</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Concepts</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Gratis_versus_libre" title="Gratis versus libre"><i>Gratis</i> versus <i>libre</i></a></li> <li><a href="/wiki/Subscription_business_model" title="Subscription business model">Subscription business model</a></li> <li><a href="/wiki/Subscribe_to_Open" title="Subscribe to Open">Subscribe to Open</a></li> <li><a href="/wiki/Paywall" title="Paywall">Paywall</a></li> <li><a href="/wiki/Copyright_transfer_agreement" title="Copyright transfer agreement">Copyright transfer agreement</a></li> <li><a href="/wiki/Academic_journal" title="Academic journal">Academic journal</a></li> <li><a href="/wiki/Scientific_journal" title="Scientific journal">Scientific journal</a></li> <li><a href="/wiki/Manuscript_(publishing)" title="Manuscript (publishing)">Manuscript</a></li> <li><a href="/wiki/Preprint" title="Preprint">Preprint</a></li> <li><a href="/wiki/Postprint" title="Postprint">Postprint</a></li> <li><a href="/wiki/Article_processing_charge" title="Article processing charge">Article processing charge</a></li> <li><a href="/wiki/Predatory_publishing" title="Predatory publishing">Predatory publishing</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Statements</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Budapest_Open_Access_Initiative" title="Budapest Open Access Initiative">Budapest Open Access Initiative</a></li> <li><a href="/wiki/Berlin_Declaration_on_Open_Access_to_Knowledge_in_the_Sciences_and_Humanities" title="Berlin Declaration on Open Access to Knowledge in the Sciences and Humanities">Berlin Declaration</a></li> <li><a href="/wiki/Bethesda_Statement_on_Open_Access_Publishing" title="Bethesda Statement on Open Access Publishing">Bethesda Statement</a></li> <li><a href="/wiki/San_Francisco_Declaration_on_Research_Assessment" title="San Francisco Declaration on Research Assessment">DORA</a></li> <li><a href="/wiki/Durham_Statement_on_Open_Access_to_Legal_Scholarship" title="Durham Statement on Open Access to Legal Scholarship">Durham Statement</a></li> <li><a href="/wiki/Geneva_Declaration_on_the_Future_of_the_World_Intellectual_Property_Organization" title="Geneva Declaration on the Future of the World Intellectual Property Organization">Geneva Declaration</a></li> <li><a href="/wiki/NIH_Public_Access_Policy" title="NIH Public Access Policy">NIH Public Access Policy</a></li> <li><a href="/wiki/Research_Works_Act" title="Research Works Act">Research Works Act</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Strategies</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Self-archiving" title="Self-archiving">Self-archiving</a></li> <li><a href="/wiki/Open-access_mandate" title="Open-access mandate">Open-access mandate</a></li> <li><a href="/wiki/Open-access_repository" title="Open-access repository">Open-access repository</a></li> <li><a href="/wiki/Hybrid_open-access_journal" title="Hybrid open-access journal">Hybrid open-access journal</a></li> <li><a href="/wiki/Delayed_open-access_journal" title="Delayed open-access journal">Delayed open-access journal</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Projects and<br />organizations</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/The_Cost_of_Knowledge" title="The Cost of Knowledge">The Cost of Knowledge</a></li> <li><a href="/wiki/Creative_Commons" title="Creative Commons">Creative Commons</a></li> <li><a href="/wiki/Directory_of_Open_Access_Books" class="mw-redirect" title="Directory of Open Access Books">Directory of Open Access Books</a><span class="noprint" style="font-size:85%; font-style: normal;"> [<a href="https://www.wikidata.org/wiki/Special:EntityPage/Q21750281#sitelinks-wikipedia" class="extiw" title="d:Special:EntityPage/Q21750281"><span title=""Directory of Open Access Books" in other languages">Wikidata</span></a>]</span></li> <li><a href="/wiki/Directory_of_Open_Access_Journals" title="Directory of Open Access Journals">Directory of Open Access Journals</a></li> <li><a href="/wiki/Initiative_for_Open_Citations" title="Initiative for Open Citations">Initiative for Open Citations</a></li> <li><a href="/wiki/Open_Access_Scholarly_Publishing_Association" title="Open Access Scholarly Publishing Association">Open Access Scholarly Publishing Association</a></li> <li><a href="/wiki/OpenAIRE" class="mw-redirect" title="OpenAIRE">OpenAIRE</a></li> <li><a href="/wiki/Open_Archives_Initiative" title="Open Archives Initiative">Open Archives Initiative</a></li> <li><a href="/wiki/Open_Knowledge_Foundation" title="Open Knowledge Foundation">Open Knowledge Foundation</a></li> <li><a href="/wiki/Open_Society_Foundations" title="Open Society Foundations">Open Society Foundations</a></li> <li><a href="/wiki/Plan_S" title="Plan S">Plan S</a></li> <li><a href="/wiki/Public_Library_of_Science" class="mw-redirect" title="Public Library of Science">Public Library of Science</a></li> <li><a href="/wiki/Public_Knowledge_Project" title="Public Knowledge Project">Public Knowledge Project</a></li> <li><a href="/wiki/Registry_of_Open_Access_Repositories" title="Registry of Open Access Repositories">Registry of Open Access Repositories</a></li> <li><a href="/wiki/Scholarly_Publishing_and_Academic_Resources_Coalition" title="Scholarly Publishing and Academic Resources Coalition">Scholarly Publishing and Academic Resources Coalition</a></li> <li><a href="/wiki/Sci-Hub" title="Sci-Hub">Sci-Hub</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">By country</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Open_access_in_Australia" title="Open access in Australia">Australia</a></li> <li><a href="/wiki/Open_access_in_Austria" title="Open access in Austria">Austria</a></li> <li><a href="/wiki/Open_access_in_Belgium" title="Open access in Belgium">Belgium</a></li> <li><a href="/wiki/Open_access_in_Canada" title="Open access in Canada">Canada</a></li> <li><a href="/wiki/Open_access_in_Denmark" title="Open access in Denmark">Denmark</a></li> <li><a href="/wiki/Open_access_in_France" title="Open access in France">France</a></li> <li><a href="/wiki/Open_access_in_Germany" title="Open access in Germany">Germany</a></li> <li><a href="/wiki/Open_access_in_Greece" title="Open access in Greece">Greece</a></li> <li><a href="/wiki/Open_access_in_Hungary" title="Open access in Hungary">Hungary</a></li> <li><a href="/wiki/Open_access_in_India" title="Open access in India">India</a></li> <li><a href="/wiki/Open_access_in_the_Republic_of_Ireland" title="Open access in the Republic of Ireland">Republic of Ireland</a></li> <li><a href="/wiki/Open_access_in_Italy" title="Open access in Italy">Italy</a></li> <li><a href="/wiki/Open_access_in_the_Netherlands" title="Open access in the Netherlands">Netherlands</a></li> <li><a href="/wiki/Open_access_in_New_Zealand" title="Open access in New Zealand">New Zealand</a></li> <li><a href="/wiki/Open_access_in_Norway" title="Open access in Norway">Norway</a></li> <li><a href="/wiki/Open_access_in_Poland" title="Open access in Poland">Poland</a></li> <li><a href="/wiki/Open_access_in_Portugal" title="Open access in Portugal">Portugal</a></li> <li><a href="/wiki/Open_access_in_Russia" title="Open access in Russia">Russia</a></li> <li><a href="/wiki/Open_access_in_South_Africa" title="Open access in South Africa">South Africa</a></li> <li><a href="/wiki/Open_access_in_Spain" title="Open access in Spain">Spain</a></li> <li><a href="/wiki/Open_access_in_Sweden" title="Open access in Sweden">Sweden</a></li> <li><a href="/wiki/Open_access_in_Ukraine" title="Open access in Ukraine">Ukraine</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Access_to_Knowledge_movement" title="Access to Knowledge movement">Access to Knowledge movement</a></li> <li><a href="/wiki/Access2Research" title="Access2Research">Access2Research</a></li> <li><a href="/wiki/List_of_open-access_journals" title="List of open-access journals">List of open-access journals</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><a href="/wiki/Open_content" class="mw-redirect" title="Open content">Open content</a></li> <li><a href="/wiki/Open_data" title="Open data">Open data</a></li> <li><a href="/wiki/Open_education" title="Open education">Open education</a></li> <li><a href="/wiki/Open_government" title="Open government">Open government</a></li> <li><a href="/wiki/Open-source_hardware" title="Open-source hardware">Open hardware</a></li> <li><a href="/wiki/Open_knowledge" title="Open knowledge">Open knowledge</a></li> <li><a href="/wiki/Open_science" title="Open science">Open science</a></li> <li><a href="/wiki/Open-source-software_movement" title="Open-source-software movement">Open source</a></li></ul> </div></td></tr></tbody></table></div>    </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://en.wikipedia.org/w/index.php?title=BASE_(search_engine)&oldid=1208272959">https://en.wikipedia.org/w/index.php?title=BASE_(search_engine)&oldid=1208272959</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Internet_search_engines" title="Category:Internet search engines">Internet search engines</a></li><li><a href="/wiki/Category:Open_access_(publishing)" title="Category:Open access (publishing)">Open access (publishing)</a></li><li><a href="/wiki/Category:Bibliographic_databases_and_indexes" title="Category:Bibliographic databases and indexes">Bibliographic databases and indexes</a></li><li><a href="/wiki/Category:Scholarly_search_services" title="Category:Scholarly search services">Scholarly search services</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Articles_with_short_description" title="Category:Articles with short description">Articles with short description</a></li><li><a href="/wiki/Category:Short_description_matches_Wikidata" title="Category:Short description matches Wikidata">Short description matches Wikidata</a></li><li><a href="/wiki/Category:Official_website_different_in_Wikidata_and_Wikipedia" title="Category:Official website different in Wikidata and Wikipedia">Official website different in Wikidata and Wikipedia</a></li><li><a href="/wiki/Category:Pages_using_interlanguage_link_with_the_wikidata_parameter" title="Category:Pages using interlanguage link with the wikidata parameter">Pages using interlanguage link with the wikidata parameter</a></li></ul></div></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 16 February 2024, at 23:12<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. By using this site, you agree to the <a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Terms_of_Use" class="extiw" title="foundation:Special:MyLanguage/Policy:Terms of Use">Terms of Use</a> and <a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy" class="extiw" title="foundation:Special:MyLanguage/Policy:Privacy policy">Privacy Policy</a>. Wikipedia® is a registered trademark of the <a rel="nofollow" class="external text" href="https://wikimediafoundation.org/">Wikimedia Foundation, Inc.</a>, a non-profit organization.</li> </ul> <ul id="footer-places"> <li id="footer-places-privacy"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy">Privacy policy</a></li> <li id="footer-places-about"><a href="/wiki/Wikipedia:About">About Wikipedia</a></li> <li id="footer-places-disclaimers"><a href="/wiki/Wikipedia:General_disclaimer">Disclaimers</a></li> <li id="footer-places-contact"><a href="//en.wikipedia.org/wiki/Wikipedia:Contact_us">Contact Wikipedia</a></li> <li id="footer-places-wm-codeofconduct"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Universal_Code_of_Conduct">Code of Conduct</a></li> <li id="footer-places-developers"><a href="https://developer.wikimedia.org">Developers</a></li> <li id="footer-places-statslink"><a href="https://stats.wikimedia.org/#/en.wikipedia.org">Statistics</a></li> <li id="footer-places-cookiestatement"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Cookie_statement">Cookie statement</a></li> <li id="footer-places-mobileview"><a href="//en.m.wikipedia.org/w/index.php?title=BASE_(search_engine)&mobileaction=toggle_view_mobile" class="noprint stopMobileRedirectToggle">Mobile view</a></li> </ul> <ul id="footer-icons" class="noprint"> <li id="footer-copyrightico"><a href="https://wikimediafoundation.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/static/images/footer/wikimedia-button.svg" width="84" height="29" alt="Wikimedia Foundation" loading="lazy"></a></li> <li id="footer-poweredbyico"><a href="https://www.mediawiki.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/w/resources/assets/poweredby_mediawiki.svg" alt="Powered by MediaWiki" width="88" height="31" loading="lazy"></a></li> </ul> </footer> </div> </div> </div> <div class="vector-settings" id="p-dock-bottom"> <ul></ul> </div><script>(RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgHostname":"mw-web.codfw.main-5cd4cd96d5-c8skm","wgBackendResponseTime":198,"wgPageParseReport":{"limitreport":{"cputime":"0.399","walltime":"0.534","ppvisitednodes":{"value":1648,"limit":1000000},"postexpandincludesize":{"value":35913,"limit":2097152},"templateargumentsize":{"value":1824,"limit":2097152},"expansiondepth":{"value":21,"limit":100},"expensivefunctioncount":{"value":3,"limit":500},"unstrip-depth":{"value":1,"limit":20},"unstrip-size":{"value":27658,"limit":5000000},"entityaccesscount":{"value":1,"limit":400},"timingprofile":["100.00% 474.762 1 -total"," 31.10% 147.657 1 Template:Infobox_website"," 28.64% 135.973 1 Template:Infobox"," 25.79% 122.439 1 Template:Reflist"," 22.37% 106.192 5 Template:Cite_web"," 21.92% 104.074 1 Template:Open_access_navbox"," 21.40% 101.618 1 Template:Navbox"," 16.83% 79.900 18 Template:If_empty"," 16.48% 78.256 1 Template:Short_description"," 9.67% 45.932 2 Template:Pagetype"]},"scribunto":{"limitreport-timeusage":{"value":"0.251","limit":"10.000"},"limitreport-memusage":{"value":4641448,"limit":52428800}},"cachereport":{"origin":"mw-web.codfw.main-7d69b799d9-rt9xs","timestamp":"20241126201251","ttl":2592000,"transientcontent":false}}});});</script> <script type="application/ld+json">{"@context":"https:\/\/schema.org","@type":"Article","name":"BASE (search engine)","url":"https:\/\/en.wikipedia.org\/wiki\/BASE_(search_engine)","sameAs":"http:\/\/www.wikidata.org\/entity\/Q448335","mainEntity":"http:\/\/www.wikidata.org\/entity\/Q448335","author":{"@type":"Organization","name":"Contributors to Wikimedia projects"},"publisher":{"@type":"Organization","name":"Wikimedia Foundation, Inc.","logo":{"@type":"ImageObject","url":"https:\/\/www.wikimedia.org\/static\/images\/wmf-hor-googpub.png"}},"datePublished":"2007-05-16T11:29:31Z","dateModified":"2024-02-16T23:12:08Z","image":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/4\/40\/BASE_search_engine_logo.svg","headline":"academic search engine"}</script> </body> </html>