Follow up to r56639: Remove some existence check duplication and fix ApiUpload for...

[lhc/web/wiklou.git] / RELEASE-NOTES

= MediaWiki release notes =

Security reminder: MediaWiki does not require PHP's register_globals
setting since version 1.2.0. If you have it on, turn it *off* if you can.

== MediaWiki 1.16 ==

THIS IS NOT A RELEASE YET

MediaWiki is now using a "continuous integration" development model with
quarterly snapshot releases. The latest development code is always kept
"ready to run", and in fact runs our own sites on Wikipedia.

Release branches will continue to receive security updates for about a year
from first release, but nonessential bugfixes and feature developments
will be made on the development trunk and appear in the next quarterly release.

Those wishing to use the latest code instead of a branch release can obtain
it from source control: http://www.mediawiki.org/wiki/Download_from_SVN

=== Configuration changes in 1.16 ===  

* $wgEnableFirefogg enable support for firefogg extension, firefogg supports
  in-browser transcoding, chunk uploads and client side hash checking. 
* $wgEnableTemporalOggUrls enable oggz_chop support a server side ogg seeking
  helper 
* $wgEnableScriptLoader if the script-loader shoudl be enabled
* $wgJSAutoloadClasses array of javascript classes to file paths used by
  script-loader to load javascript by class name. 
* $wgEnableJS2system  if we should include js2 stuff like jquery, mv_embed.js
  (script-loader helper) and use new interfaces for upload
* $wgEnableScriptLoaderJsFile if we support grabbing js files with the script
  loader. By default we only grab classes in $wgJSAutoloadClasses
* $wgEnableScriptMinify if you want the script loader to minify js
* $wgEnableScriptLocalization if you want the script loader to do msg lookups
* $wgMwEmbedDirectory the path to MwEmbed Directory (maybe we can depreciate
  this. Was used when mwEmbed was going to be an extension.   
* $wgDebugJavaScript if we want to enable fresh debug javascript 
* $wgPhpCliPath Path to php-cli for spinning up background php processes
* (bug 18222) $wgMinimalPasswordLength default is now 1
* $wgSessionHandler can be used to configure session.save_handler
* $wgLocalFileRepo/$wgForeignFileRepos now have a 'fileMode' parameter to
  be used when uploading/moving files
* (bug 18761) $wgHiddenPrefs is a new array for specifying preferences not
  to be shown to users
* $wgAllowRealName and $wgAllowUserSkin were deprecated in favor of
  $wgHiddenPrefs[] = 'realname', but the former are still retained
  for backwards-compatibility
* (bug 9257) $wgRCMaxAge now defaults to three months
* $wgDevelopmentWarnings can be set to true to show warnings about deprecated
  functions and other potential errors when developing.
* Subpages are now enabled in the MediaWiki namespace by default.  This is
  mainly a cosmetic change, and does not in any way affect the MessageCache,
  which was already effectively treating the namespace as if it had subpages.
* (bug 10837) $wgVariant is a user variant selected in the user's preferences
  if the $wgContLang does not have variant, then the $wgLang is used instead.
* Oracle: maintenance/ora/user.sql script for creating DB user on oracle with
  appropriate privileges. Creating this user with web-install page requires
  oci8.privileged_connect set to On in php.ini.
* Removed UserrightsChangeableGroups hook introduced in 1.14
* Added $wgCacheDirectory, to replace $wgFileCacheDirectory, 
  $wgLocalMessageCache, and any other local caches which need a place to put 
  files. 
* $wgFileCacheDirectory is no longer set to anything by default, and so either
  needs to be set explicitly, or $wgCacheDirectory needs to be set instead. 
* $wgLocalMessageCache has been removed. Instead, set $wgUseLocalMessageCache
  to true
* Removed $wgEnableSerializedMessages and $wgCheckSerialized. Similar 
  functionality is now available via $wgLocalisationCacheConf.
* $wgMessageCache->addMessages() is deprecated. Messages added via this 
  interface will not appear in Special:AllMessages.
* $wgRegisterInternalExternals can be used to record external links pointing 
  to same server
* $wgSpecialVersionExtended shows the extended version information besides 
  PHP and database version.
* (bug 19907) $wgCrossSiteAJAXdomains and $wgCrossSiteAJAXdomainExceptions added 
  to control which external domains may access the API via cross-site AJAX.
* $wgMaintenanceScripts for extensions to add their scripts to the default list
* $wgMemoryLimit has been added, default value '50M'
* $wgExtraRandompageSQL is deprecated, the SpecialRandomGetRandomTitle hook 
  should be used instead
* (bug 20489) $wgIllegalFileChars added to override the default list of illegal
  characters in file names.
* (bug 19646) $wgImgAuthDetails added  to display reason access to uploaded file
  was denied to users(img_auth only)
* (bug 19646) $wgImgAuthPublicTest added to test to see if img_auth set up
  correctly (img_auth only)
* $wgUploadMaintenance added to disable file deletions and restorations during
  maintenance

=== New features in 1.16 ===

* Add CSS defintion of the 'wikitable' class to shared.css
* (bug 17163) Added MediaWiki:Talkpageheader which will be displayed when
  viewing talk pages
* Superfluous border="0" removed from images
* Added new hook 'MessageCacheReplace' into MessageCache.php. For instance
  to allow extensions to update caches in similar way as MediaWiki invalidates
  a cached MonoBook sidebar
* Special:AllPages: Move hardcoded styles from code to CSS
* (bug 18529) New hook: SoftwareInfo for adding information about the software
  to Special:Version
* Added $wgExtPGAlteredFields to allow extensions to easily alter the data
  type of columns when using the Postgres backend.
* (bug 16950) Show move log when viewing/creating a deleted page
* (bug 18242) Show the Subversion revision number per extensions in
  Special:Version
* (bug 18420) Missing file revisions are handled gracefully now
* (bug 9219) Auth plugins can control editing RealName/Email/Nick preferences
* (bug 18466) Add note or warning when overruling a move (semi-)protection
* (bug 18342) insertTags works in edit summary box
* (bug 18411) The upload form also checks post_max_size
* Watchlist now has a specialized <div> tag that contains a unique class for
  each page
* Added Minguo calendar support for the Taiwan Chinese language
* Database: unionQueries function to be used for UNION sql construction, so
  it can be overloaded on DB abstraction level for DB specific functionality
* (bug 18849) Implement Japanese and North Korean calendars
* (bug 5755) Introduce {{CURRENTMONTH1}} and {{LOCALMONTH1}} to display the
  month number without the leading zero
* (bug 13456) categoriespagetext supports PLURAL
* (bug 18860) Blocks of IPs affecting registered users can now block email
* (bug 17093) Date and time are separate parameters in Special:BlockList
* (bug 11484) Added ISO speed rating to default collapsed EXIF metadata view
* (bug 14866) Messages 'recentchangeslinked-toolbox' and
  'recentchangeslinked-toolbox' were added to allow more fine grained
  customisation of the user interface
* DISPLAYTITLE now accepts a limited amount of wiki markup (the single-quote
  items)
* Special:Search now could search terms in all variant-forms. ONLY apply on
  wikis enabled LanguageConverter.
* Add autopromote condition APCOND_BLOCKED to autopromote blocked users to various
  user groups.
* Add $wgRevokePermissions as a means of restricting a group's rights. The
  syntax is identical to $wgGroupPermissions, but users in these groups will
  have these rights stripped from them.
* Added a PHP port of CDB (constant database), for improved local caching when
  the DBA extension is not available.
* Introduced a new system for localisation caching. The system is based around 
  fast fetches of individual messages, minimising memory overhead and startup 
  time in the typical case. The database backend will be used by default, but 
  set $wgCacheDirectory to get a faster CDB-based implementation.
* Expanded the number of variables which can be set in the extension messages 
  files.
* Added a feature to allow per-article process pool size control for the parsing 
  task, to limit resource usage when the cache for a heavily-viewed article is
  invalidated. Requires an external daemon. 
* (bug 19576) Moved the id attribues from the anchors accompanying section
  headers to the <span class="mw-headline"> elements within the section headers,
  removing the redundant anchor elements.
* Parser::setFunctionTagHook now can be used to add a new tag which is parsed at
  preprocesor level.
* Added $wgShowArchiveThumbnails, allowing sysadmins to disable thumbnail 
  display for old versions of images.
* In watchlists and Special:RecentChanges, the difference in page size now
  appears in dark green if bytes were added and dark red if bytes were removed.
* Added FSRepo configuration properties thumbUrl and thumbDir, to allow the 
  thumbnails to be stored in a separate location to the source images.
* If config/ directory is not executable, the command to make it executable 
  now asks the user to cd to the correct directory
* Add experimental new external authentication framework, ExternalAuth
* (bug 18768) Remove AdminSettings requirements. Maintenance environment
  will still load it if it exists, but it's not required for anything
* (bug 19900) The "listgrouprights-key" message is now wrapped in a div with
  class "mw-listgrouprights-key"
* (bug 471) Allow RSS feeds for watchlist, using an opt-in security token
* (bug 10812) Interwiki links can have names and descriptions, fetched from 
  message 'interwiki-desc-PREFIX', not really used anywhere yet though
* (bug 9691) Add type (signup or login) parameter to
  AuthPlugin::ModifyUITemplate()
* (bug 14454) "Member of group(s)" in Special:Preferences causes language
  difficulties
* (bug 16697) Unicode combining characters are difficult to edit in some
  browsers
* Parser test supports uploading results to remote CodeReview instance
* (bug 20013) Added CSS class "mw-version-ext-version" is wrapped on the 
  extension version in Special:Version
* (bug 20014) Added CSS class "mw-listgrouprights-right-name" is wrapped on the
  right name in Special:ListGroupRights
* (bug 12920) New CoreParserFunction {{nse:...}} as an url-friendly equivalent
  to {{ns:...}}
* (bug 16322) Allow maintenance scripts to accept DB user/pass over input or
  params
* (bug 18566) Maintenance script to un/protect pages
* (bug 671) The HTML <abbr> tag is now permitted.
* RecentChanges now has a legend to explain what the Nmb! flags mean, and the
  flags have tooltips.
* (bug 15209) New hook BeforeInitialize called after everything has been setup
  but before Mediawiki::performRequestForTitle()
* wgMainPageTitle variable now available to JavaScript code to identify the main
  page link, so it doesn't have to be extracted from the link URLs.
* (bug 16836) Display preview of signature in user preferences and describe its
  use
* The default output format is now HTML 5 instead of XHTML 1.0 Transitional.
  This can be disabled by setting $wgHtml5 = false;.  Specific features enabled
  if HTML 5 is used:
** New HTML 5 input attributes allow JavaScript-free input validation in some
   cutting-edge browsers.  E.g., some inputs will be autofocused, users will
   not be allowed to submit forms with certain types of invalid values (like
   numbers outside the permitted ranges), etc.
** The summary attribute has been removed from tables of contents.  summary is
   obsolete in HTML 5 and wasn't useful here anyway.
** Unnecessary type="" attribute removed for CSS and JS.
** If $wgWellFormedXml is set to false, some bytes will be shaved off of HTML
   output by omitting some things like quotation marks where HTML 5 allows.
* The description message in $wgExtensionCredits can be an array with parameters
* New hook SpecialRandomGetRandomTitle allows extensions to modify the selection
  criteria used by Special:Random and subclasses, or substitute a custom result,
  deprecating the $wgExtraRandompageSQL config variable
* (bug 20318) Distinct CSS classes for ISBN/RFC/PMID special links added
* (bug 20404) Custom fields in the user creation form template can now have
  detail labels in prefsectiontip divs.
* MakeSysop and MakeBot are now aliases for Special:UserRights
* IndexPager->mLimitsShown can now be an associative array of limit => text-to-
  display-in-limit-form.
* (bug 18880) LogEventsList::showLogExtract() can now take a string-by-reference
  and add its HTML to it, rather than having to go straight to $wgOut.
* Added $wgShowDBErrorBacktrace, to allow users to easily gather backtraces for
  database connection and query errors.
* Show change block / unblock link on Special:Contributions if user is blocked
* Display note on Special:Contributions if the user is blocked, and provide an 
  excerpt from the block log.
* (bug 19646) New hook: ImgAuthBeforeStream for tests and functionality before
  file is streamed to user, but only when using img_auth
* Note on non-existing user and user talk pages if user does not exist
* New hook ShowMissingArticle so extensions can modify the output for 
  non-existent pages.
* Added $wgUseAJAXCategories allow enabling AJAX based categories system.
  This works on all namespaces. Enabled namespaces can be reduces using
  $wgAJAXCategoriesNamespaces.
* Admins could disable some variants using $wgDisabledVariants now. ONLY apply on
  wikis enabled LanguageConverter.
* A new permission, 'root', is created.  Analogous to root users on Unix systems,
  the root permission effectively grants all other permissions on a wiki.  Useful
  for debugging and administration.

=== Bug fixes in 1.16 ===

* (bug 18031) Make namespace selector on Special:Export remember the previous
  selection
* The svn-version version numbers on Special:Version have been removed
* (bug 17374) Special:Export no longer exports two copies of the same page
* (bug 18190) Proper parsing in MediaWiki:Sharedupload message
* (bug 17617) HTML cleanup for ImagePage
* (bug 17964) namespaceDupes.php no longer fails on an empty interwiki table
* Improved error handling for image moving
* (bug 17974) On Special:SpecialPages, restricted special pages are now marked
  with <strong> tags, helps with text-based browsers
* (bug 18259) Special:DeletedContributions now also uses
  MediaWiki:Sp-contributions-logs for the link to Special:Log
* Don't add empty title="" attributes to links to anchors on the current page
* (bug 18291) rebuildrecentchanges.php failed to add deletion log entries
* (bug 18304) rebuildrecentchanges.php got size changes wrong
* (bug 18170) Fixed a PHP warning in Parser::preSaveTransform() in PHP 5.3
* (bug 18289) Database connection error page now returns correct HTML
* "successbox", "errorbox" and related CSS classes are now available in all
  skins
* (bug 18316) Removed superfluous name="fulltext" from Special:Search
* (bug 18331) MediaWiki:Undelete-revision can now have wikitext
* The "noautoblock" flag is no longer displayed in the block log when blocking
  an IP address
* (bug 18009) $wgHooks and $wgExtensionFunctions now support closures
* (bug 17948) Maintenance scripts now exit(0) or exit(1) as appropriate
* (bug 18377) Time in Enhanced ChangesList lacking localisation
* (bug 12998) Allow <sup>, <sub>, etc. in DISPLAYTITLE
* (bug 1553) Lowercase navigation headings in German
* (bug 7830) Pending transactions failed to commit on loginToUse() error
* (bug 11613) session.save_handler being over-ridden
* (bug 11381) session.save_handler being set twice (causes error)
* (bug 17835) ForeignAPIRepo throwing error on first page load for file
* (bug 18115) ForeignAPIRepo cache isn't working
* Fixed a bug caused by LanguageConverter.php, which brings an abnormal '}-'
  after some parsed math syntax.
* (bug 18441) rebuildrecentchanges.inc no longer ignores $wgLogRestrictions
* (bug 18317) Bolded selections in 1 | 3 | etc days on RecentChanges now use
  <strong> instead of hardcoded styles
* (bug 18449) Fixed items number per column on category pages when the total is
  divisible by 3
* (bug 18121) maintenance/deleteArchivedRevisions.php no longer deletes
  revisions when --delete is not passed
* (bug 13172) GPS coordinates in image Exif data are now actually displayed
* Overhaul of preferences system, includes the following bug fixes:
* (bug 5363) Changes to default preferences now impact registered users.
* (bug 14806) Hook to enable putting preferences in existing tabs.
* (bug 17191) Registration date now listed on preferences page.
* Note that this change will break some extensions which have not been adapted
  for it.
* (bug 17020) Adding fallback encodings for Traditional and Simplified Chinese
  languages while the the text is typed as URLs.
* (bug 17614) Prev / Next links are not shown if all results are shown
* (bug 18207) Strange spacing before [[irc:...]] links
* Removed float from the user login form in RTL interface - caused display
  problems in FF2
* (bug 15008) Redirect images are now subject to Bad image list rules
* (bug 6802) profileinfo.php now also work on other database servers than MySQL
* (bug 16925) Diffs no longer fail when $wgExternalDiffEngine is set to
  'wikidiff' or 'wikidiff2' but extension is not installed
* (bug 18326) Chmod errors in file repos have been hidden
* (bug 18718) Comma after a } create a error in IE
* (bug 18716) Removed redundant class in Modern skin CSS for category links and
  tweaked spacing.
* (bug 18656) Use proper directory separators in wfMkdirParents()
* (bug 18549) Make Special:Blockip respect $wgEnableUserEmail and
  $wgSysopEmailBans
* (bug 16912) Tooltips on images with link= disappear
* (bug 18389) Localise numbers in EXIF data
* (bug 18522) Wrap MediaWiki:Protect-cascadeon in a div for identification
* (bug 18438) Tweak HTML for preview bar for consistency and accessibility
* (bug 18432) Updated documentation for dumpBackup.php
* Fix array logic in Sanitizer::removeHTMLtags so that it doesn't strip good
  tags that were redundantly defined.
* (bug 14118) SpecialPage::getTitleFor does not return a localised name
* (bug 18698) Renaming non entry point maintenance scripts from .inc.php to
  .inc
* Deprecated methods Title::getInterwikiLink, Title::userCanCreate(),
  Title::userCanEdit() and Title::userCanMove() have been removed
* Only show upload links on file description if $wgEnableUploads = true
  and user can upload
* Don't say "You need to log in to upload/move", because it's possible that
  uploading/moving is disabled for registered users as well (e.g. only sysops)
* (bug 18943) Handle invalid titles gracefully at Special:Mostlinked
* (bug 8873) Enable variant conversion in text on 'alt' and 'title' attributes
* (bug 10837) Introducing the StubUserVariant class to determine the variant
  variable instead of using this to overrules the user language preference.
* (bug 19014) If user had deletedhistory right, but not undeleted right, then
  show "view" instead of "view/restore" on logs.
* (bug 19017) TOC level calculation error in an odd case
* (bug 18999) CSS update for RTL interwiki links
* (bug 18925) history.js removes class names of list elements on initialization
* Multiple whitespace in TOC anchors is now stripped, for consistency with the
  link from the edit comment
* (bug 19112) Preferences now respects $wgUseExternalEditor
* (bug 18173) MediaWiki now fails when unable to determine a client IP
* (bug 19170) Special:Version should follow the content language direction
* (bug 19160) maintenance/purgeOldText.inc is now compatible with PostgreSQL
* Fixed performance regression in "bad image list" feature
* Show user preference 'Use live preview' if $wgLivePreview is enabled only
* (bug 17014) Blocked users can no longer use Special:UserRights unless they
  can add/remove *all* groups (have 'userrights' permission).
* (bug 19294) Always show Sp-contributions-footer(-anon)
* Attempts to restrict reading of pages while anonymous viewing is allowed
  via extensions not using the userCan hook and via $wgRevokePermissions now
  work.
* (bug 8445) Multiple-character search terms are now handled properly for
  Chinese
* (bug 19450) Use formatNum for "Number of edits" in Special:Preferences
* (bug 11242) Check for MySQL storage engines during installation now checks
  whether the engines are actually available
* (bug 19390) Omit the "printable version" link on the printable version
* (bug 18394) img_auth.php now respects userCan
* (bug 19509) Uploading to a file named '0' previously treated it as null input
   and attempted to upload with the source name. Now warns about not having an
   extension (since 0.ext is perfectly valid)
* (bug 19468) Enotif preferences are now only displayed when they are turned on
* (bug 19442) Show/hide options on watchlist only work once
* (bug 19602) PubMed Magic links now use updated NIH url
* (bug 19637) externallinks have links to self
* Don't load Opera 9.5 RTL fixes for Opera 9.6
* Remove five-year-old KHTMLFixes.css, which is unlikely to be relevant anymore
  and was causing problems.
* Removed repetition of URIs in the title attributes of external links.
* (bug 19693) User name is now escaped in "Contributions for ..." link on
  Special:BlockIP
* (bug 19571) Override buildConcat for SQLite.
* Log in and log out links no longer return to page view when clicked from
  history view, edit page, or something similar
* (bug 19513) RTL fixes for new Search UI
* (bug 16497) Special:Allmessages is paginated
* (bug 18708) CSS plainlinks class now available to all skins
* (bug 19590) Database error messages no longer have "MySQL" hardcoded as the 
  database type
* (bug 19759) successbox on Special:Preferences now correctly aligned on
  standard, nostalgia and cologneblue skin
* (bug 19814) interwiki links from file links ([[File:Foo.jpg|link=de:Test]])
  are no longer recorded in the pagelinks table
* (bug 19784) date option "ISO 8601" produced illegal id
* (bug 19761) Removed autogenerated <meta keywords> tag with link data.
  Keyword set was not useful, and is ignored by modern search engines anway.
* (bug 19827) Special:SpecialPages title is "Upload file
* (bug 19355) Added .xhtml, .xht to upload file extension blacklist
* (bug 19287) Workaround for lag on history page in Firefox 3.5
* (bug 19564) Updated docs/hooks.txt
* (bug 18751) Fix for buggage in profiling setup for some extensions on PHP 5.1
* (bug 17139) ts_resortTable inconsistent trimming makes date sorting fragile
* (bug 19445) Change oldimage table to use ON UPDATE CASCADE for FK to image
  table.
* (bug 14080) Short notation links to subpages didn't work in edit summaries
* (bug 17374) Special:Export no longer exports multiple copies of pages
* (bug 19818) Edits to user CSS/JS subpages can now be marked as patrolled by
  users who can't edit them
* (bug 19839) Comments in log items are no more double escaped
* (bug 18161) Fix inconsistent separators in watchlist link toolbars with
  "enhanced recent changes"
* (bug 16877) Moving a page over a redirect no longer leaves an orphan entry in
  the recentchanges table
* (bug 16009) Limit selection forms based on Pager now links to the correct page
  when using long urls
* The display of the language list on the preferences is more comply with the 
  BCP 47 standards.
* (bug 19849) Custom X-Vary-Options header now disabled unless $wgUseXVO is set
* (bug 19301) Duplicates entries in $wgAddGroups, $wgRemoveGroups,
  $wgGroupsAddToSelf and $wgGroupsRemoveFromSelf are no more displayed on
  Special:ListGroupRights
* (bug 18799) Special:Userlogin now handles correctly the returnto parameter
  to not link back to Special:Userlogout when user's language isn't the same as
  content's language
* (bug 19479) Show proper error message when unable to connect to PostgreSQL
  database with username/password in MediaWiki's setup
* (bugs 18407, 18409) Special:Upload is now listed on Special:Specialpages only
  if uploads are enabled and the user can access it
* (bug 17988) Spaces before [[Category:]] links are no longer ignored
* (bug 19957) All known-failing tests now marked disabled; added --run-disabled
  option to parser test suite to run disabled tests if desired.
* (bug 16311) Make recent change flags (n/m/b) <abbr>s instead of <span>s
* (bug 15680) Split the edit tip message of user CSS/JS subpage into 
  "usercssyoucanpreview" and "userjsyoucanpreview" respectively.
* (bug 12110) Split the rights for editing users' CSS/JS subpage from 
  "editusercssjs" into "editusercss" and edituserjs" respectively.
* (bug 19394) RecentChanges feed URLs for log items with no revisions 
  (eg Newuser, Userrights) are no longer broken
* (bug 17395) Remote file descriptions use user language ($wgLang), not wiki
  language ($wgContLang)
* (bug 11867) Lock error on redirect table when running orphans.php
* (bug 18930) initStats.php now refreshes active users count
* (bug 18699) Using the nosummary URL option no longer triggers the "You have
  not provided a summary" warning for those who activated it in their
  preferences
* (bug 18855) commandLine.inc and Maintenance.php are now properly included
  using the full path
* (bug 18497) Fixed broken style sheets in Opera fullscreen mode
* (bug 16084) Default memory limit has be increased to 50M, see $wgMemoryLimit
* (bug 17864/19519) Added proper input normalization in Special:UserRights
* (bug 20086) Add Hook to add extra statistics at the end of Special:Statistics
* (bug 19289) importDump.php can now handle bzip2 and 7zip
* (bug 20131) Fixed a PHP notice for users having the "rollback" right on
  Special:RecentChangesLinked
* Do not transform EXIF fields with pure text to avoid results like
  foo,bar@example,com
* (bug 20176) Fix login/logout links in skin CologneBlue
* (bug 20203) "Powered by Mediawiki" now has height/width on image tag
* (bug 20273) Fix broken output when no pages are found in the content
  namespaces
* (bug 20265) Make AncientPages and UnusedFiles work on SQLite
* Fixed XSS vulnerability for Internet Explorer clients (only pre-release 
  versions of MediaWiki were affected).
* (bug 14817) Moving a page to a subpage of itself moves it twice
* (bug 20289) $wgMaximumMovedPages should only count pages actually moved
* (bug 15248) Non-breaking spaces and certain other Unicode space characters
  are now normalized to ordinary spaces in titles; if your wiki has existing
  titles with such characters, run cleanupTitles.php and/or cleanupImages.php
* (bug 11143) Links containing invalid UTF-8 percent-code sequences are now
  cleanly disabled instead of breaking parsing entirely on PHP 5.2.
* (bug 20296) Fixed an PHP warning in Language::getMagic() in PHP 5.3
* (bug 20358) Unprotect tab was missing accesskey; now same as protect tab.
* (bug 20317) Cleaned up default main page link accesskey settings
* (bug 20362) Special:Statistics now produces valid HTML when view counters are
  enabled
* (bug 19857) maintenance/deleteRevision.php on last revision no longer breaks
  target page
* (bug 20365) Page name with with c/g/h/j/s/u + x are now correctly handled in
  Special:MovePage with Esperanto as content language
* (bug 20364) Fixed regression in GIF metadata loading
* (bug 20299) MediaWiki:Move-subpages and MediaWiki:Move-talk-subpages can now
  use wikitext
* (bug 15475) DatabaseBase::setFlag(), DatabaseBase::clearFlag() and
  DatabaseBase::getFlag() now have documentation
* (bug 19966) MediaWiki:License-header is now used for the licensing header in
  the file description page instead of MediaWiki:License
* (bug 20380) Links to history/deleted edits at the top of
  Special:RevisionDelete are no more displayed when when doing log suppression
* (bug 8143) Localised parser function names are now correctly case insensitive
  if they contain non-ASCII characters
* (bug 19055) maintenance/rebuildrecentchanges.php now purges
  Special:Recentchanges's RSS and Atom feed cache
* The installer will now try to bypass PHP's max_execution_time
* (bug 20260) SQLite no longer tries to automatically create the database at
  execution time, this now happens only at install time; if it is not available 
  at script execution, it now throws an exception
* Fixed EditFilterMerged hook so the hookError parameter serves a purpose
  (analogous to EditFilter hook)
* (bug 2257) Tag extensions can expand template parameters provided to the tag,
  by using a new parameter added to the recursiveTagParse function
* (bug 14900) __INDEX__ and __NOINDEX__ no longer override site config set in
  $wgArticleRobotPolicies.
* (bug 20466) Hidden categories are no more displayed when printing
* (bug 20446) When changing user rights with User@remotewiki and remotewiki is
  the local wiki, the user is now treated as the local user
* (bug 20494) OutputPage::getArticleBodyOnly() no longer requires an useless
  argument
* (bug 20136) Protection form JavaScript now synchronizes the expiry boxes on
  any change, in addition to onkeyup.
* Don't link to "edit this page" on MediaWiki:Noarticletext if user is not
  allowed to create page. Done via new message
  MediaWiki:Noarticletext-nopermission
* Improved compatibility between the Vector skin and addPortletLink() from
  wikibits.js: empty portlets are now present but hidden, adding an element to a
  portlet unhides it
* (bug 19531) addPortletLink() now wraps inserted labels in a <span> element to
  be compatible with the CSS for the Vector skin
* (bug 20578) Wrong localized image metadata - duplicated string?
* (bug 20556) Stub threshold's "other" <input> in Special:Preferences now has a
  correct type="text" parameter
* (bug 482) Don't include TOC in the printable version if it has been hidden
* Adjust the time according to the user configuration on Special:Revisiondelete
* (bug 20624) Installation no longer allows "qqq" as the chosen language
* (bug 20634) The installer-created database user will now have all rights on
  the database so that upgrades will go more smoothly.
* (bug 18180) Special:Export ignores limit, dir, offset parameters
* User::getBlockedStatus() works for all kinds of user objects and doesn't 
  assume the user object is equal to the current-user object ($wgUser)
* (bug 20517) Cancel link from edit page now returns to the old version when
  editing an old version

== API changes in 1.16 ==

* Added uiprop=changeablegroups to meta=userinfo
* Added usprop=gender to list=users
* (bug 18311) action=purge now works for images too
* Add parentid to prop=revisions output
* (bug 17832) action=delete returns 'unknownerror' instead of 'permissiondenied'
  when the user is blocked
* (bug 18546) Added timestamp of new revision to action=edit output
* (bug 18554) Also list hidden revisions in list=usercontribs for privileged
  users
* (bug 13049) "API must be accessed from the primary script entry point" error
* (bug 16422) Don't display help for format=jsonfm unless specifically requested
* Added PHP and database version to meta=siteinfo output
* (bug 18533) Add readonly message to meta=siteinfo output
* (bug 18518) Add clprop=hidden to prop=categories
* (bug 18710) Fixed internal error with empty parameter in action=paraminfo
* (bug 18709) Missing descriptions for some parameters in action=paraminfo
  output
* (bug 18731) Show correct SVN links for extension modules in api.php?version
* (bug 18730) Add version information to action=paraminfo output
* (bug 18743) Add ucprop=size to list=usercontribs
* (bug 18749) Add generator flag to action=paraminfo output
* Make action=block respect $wgEnableUserEmail and $wgSysopEmailBans
* Made deleting file description pages without files possible
* (bug 18773) Add content flag to siprop=namespaces output
* (bug 18785) Add siprop=languages to meta=siteinfo
* (bug 14200) Added user and excludeuser parameters to list=watchlist and
  list=recentchanges
* Added index, fromtitle and byteoffset fields to action=parse&prop=sections
  output
* (bug 19313) action=rollback returns wrong revid on master/slave setups
* (bug 19323) action=parse doesn't return section tree on pages with Cite
  warnings
* (bug 18720) Add anchor field to action=parse&prop=sections output
* (bug 19423) The initial file description page used caption in user lang
  rather than UI lang
* (bug 17809) Add number of users in user groups to meta=siteinfo
* (bug 18533) Add readonly reason to readonly exception
* (bug 19528) Added XSLT parameter to API queries in format=xml
* (bug 19040) Fix prependtext and appendtext in combination with section 
  parameter in action=edit
* (bug 19090) Added watchlist parameter, deprecated watch and unwatch 
  parameter in action=edit
* Added fields to list=search output: size, wordcount, timestamp, snippet
* Where supported by backend, list=search adds a 'searchinfo' element with
  optional info: 'totalhits' count and 'suggestion' alternate query term
* (bug 19907) $wgCrossSiteAJAXdomains added to allow specified (or all)
  external domains to access api.php via AJAX, if the browser supports the 
  Access-Control-Allow-Origin HTTP header
* (bug 19999) Made metadata and properties of search results optional. Added
  srprop and srinfo.
* (bug 20700) Add amprop=default to meta=allmessages to list default value for
  customized messages
* Don't parse magic words in meta=allmessages, output messages unparsed

=== Languages updated in 1.16 ===

MediaWiki supports over 300 languages. Many localisations are updated
regularly. Below only new and removed languages are listed, as well as
changes to languages because of MediaZilla reports.

* Lower Silesian (sli) (new)
* Picard (pcd) (new)
* Uyghur (Arabic script) (ug-arab) (new)
* Eastern Yiddish (ydd) (removed)
* Iriga Bicolano (bto) (removed)
* Palembang (plm) (removed)
* Tamazight (tzm) (removed)

* (bug 18474) Sorani (ckb - Central Kurdish) (renamed from ku-arab)
* Add PLURAL function for Scots Gaelic (gd)
* Add Estonian letters äöõšüž to linktrail (et)
* (bug 18776) Native name of Burmese language (my)
* (bug 18806) Use correct unicode characters in spelling of native Chuvash
  (Чӑвашла)
* (bug 18864) Updated autonym for Zhuang language
* (bug 18308) Updated date formatting in Occitan (oc)
* (bug 19080) Added ăâîşţșțĂÂÎŞŢȘȚ to Romanion (ro) linktrail
* (bug 19286) Correct commafying function in Polish (pl)
* (bug 19441) Updated date formatting for Lithuanian
* (bug 19630) Added ÄäÇçĞğŇňÖöŞşÜüÝýŽž to Turkmen (tk) linktrail
* (bug 19949) New linktrail for Greek (el)
* (bug 19809) Korean (North Korea) (ko-kp) (new)
* (bug 19968) Fixed "Project talk" namespace name for Maltese (mt)

== Compatibility ==

MediaWiki 1.16 requires PHP 5 (5.2 recommended). PHP 4 is no longer supported.

PHP 5.0.x fails on 64-bit systems due to serious bugs with array processing:
http://bugs.php.net/bug.php?id=34879
Upgrade affected systems to PHP 5.1 or higher.

MySQL 3.23.x is no longer supported; some older hosts may need to upgrade.
At this time we still recommend 4.0, but 4.1/5.0 will work fine in most cases.


== Upgrading ==

1.16 has several database changes since 1.15, and will not work without schema
updates.

If upgrading from before 1.11, and you are using a wiki as a commons reposito-
ry, make sure that it is updated as well. Otherwise, errors may arise due to
database schema changes.

If upgrading from before 1.7, you may want to run refreshLinks.php to ensure
new database fields are filled with data.

If you are upgrading from MediaWiki 1.4.x or earlier, some major database
changes are made, and there is a slightly higher chance that things could
break. Don't forget to always back up your database before upgrading!

See the file UPGRADE for more detailed upgrade instructions.


=== Caveats ===

Some output, particularly involving user-supplied inline HTML, may not
produce 100% valid or well-formed XHTML output. Testers are welcome to
set $wgMimeType = "application/xhtml+xml"; to test for remaining problem
cases, but this is not recommended on live sites. (This must be set for
MathML to display properly in Mozilla.)

For notes on 1.15.x and older releases, see HISTORY.


=== Online documentation ===

Documentation for both end-users and site administrators is currently being
built up on MediaWiki.org, and is covered under the GNU Free Documentation
License (except for pages that explicitly state that their contents are in
the public domain) :

  http://www.mediawiki.org/wiki/Documentation


=== Mailing list ===

A MediaWiki-l mailing list has been set up distinct from the Wikipedia
wikitech-l list:

  http://lists.wikimedia.org/mailman/listinfo/mediawiki-l

A low-traffic announcements-only list is also available:

  http://lists.wikimedia.org/mailman/listinfo/mediawiki-announce

It's highly recommended that you sign up for one of these lists if you're
going to run a public MediaWiki, so you can be notified of security fixes.


=== IRC help ===

There's usually someone online in #mediawiki on irc.freenode.net