RELEASE-NOTES

   1 = MediaWiki release notes =
   2
   3 Security reminder: MediaWiki does not require PHP's register_globals
   4 setting since version 1.2.0. If you have it on, turn it *off* if you can.
   5
   6 == MediaWiki 1.18 ==
   7
   8 THIS IS NOT A RELEASE YET
   9
  10 MediaWiki is now using a "continuous integration" development model with
  11 quarterly snapshot releases. The latest development code is always kept
  12 "ready to run", and in fact runs our own sites on Wikipedia.
  13
  14 Release branches will continue to receive security updates for about a year
  15 from first release, but nonessential bugfixes and feature developments
  16 will be made on the development trunk and appear in the next quarterly release.
  17
  18 Those wishing to use the latest code instead of a branch release can obtain
  19 it from source control: http://www.mediawiki.org/wiki/Download_from_SVN
  20
  21 === Configuration changes in 1.18 ===
  22 * The WantedPages::getSQL hook has been removed and replaced with
  23   WantedPages::getQueryInfo. This may break older extensions.
  24 * $wgUseCombinedLoginLink controls whether to output a combined
  25   login / create account link in the personal bar, or to output separate login
  26   and create account links.
  27 * Skin names are no longer created based on a ucfirst version of the key in
  28   $wgValidSkinNames but now the value. This means for
  29   $wgValidSkinNames["monobook"] = "MonoBook"; the skin loader will no longer try
  30   loading SkinMonobook and will instead load SkinMonoBook.
  31 * $wgMaxUploadSize may now be set to an array to specify the upload size limit
  32   per upload type.
  33 * $wgAPICacheHelp added in 1.16 is now removed. To disable API help caching, set
  34   $wgAPICacheHelpTimeout = 0;
  35 * OutputPage::isUserJsAllowed() no longer returns false when scripts are allowed
  36   by the page, but $wgAllowUserJs is set to false.
  37 * Pure "Skin" class based custom skins are no longer supported, all custom skins
  38   should be put together using SkinTemplate and BaseTemplate or QuickTemplate.
  39 * The transliteration for passwords in case they were migrated from an old
  40   Latin-1 install (previous to MediaWiki 1.5) is now only done for wikis with
  41   $wgLegacyEncoding set.
  42 * (bug 27508) Add $wgSVGMetadataCutoff to limit the maximum amount of an SVG we
  43   look at when finding metadata to prevent excessive resource usage.
  44 * $wgSysopUserBans and $wgSysopRangeBans (deprecated in 1.17) are now removed.
  45   Use $wgBlockCIDRLimit = array( 'IPv4' => 43, 'IPv6' => 128 ) to achieve the
  46   same functionality as $wgSysopRangeBans; you can use the BlockIp hook to
  47   replicate $wgSysopUserBans functionality.
  48 * The options on the block form have been standardised such that checking a box
  49   makes the block 'more serious'; so while "check to prevent account creation"
  50   and "check to enable autoblock" remain the same, "check to allow user-talk
  51   edit" is reversed to "check to *disable* user-talk edit", and "check to block
  52   anon-only" becomes "check to block logged-in users too".  The default settings
  53   remain the same.
  54 * Most of the field names on the Special:Block form have been changed, which
  55   will probably break screen-scraping bots.
  56 * (bug 26866) The 'trackback' right is no longer granted to sysops by default.
  57   $wgUseTrackbacks is already false by default.
  58 * (bug 17009) the hiddenStructure CSS class, a highly hackish way of at least
  59   *appearing* to hide article elements, has been removed.  Use the
  60   ParserFunctions extension to actually remove unwanted elements from the
  61   output.
  62 * (bug 14202) $wgUseTeX has been superseded by the Math extension. To re-enable
  63   math conversion after upgrading, obtain the Math extension from SVN or from
  64   http://www.mediawiki.org/wiki/Extension:Math and add to LocalSettings.php:
  65   require_once "$IP/extensions/Math/Math.php";
  66 * $wgProfiler is now a configuration array, see StartProfiler.sample for
  67   details.
  68 * $wgProfiling has been removed.
  69 * The spyc library is now no longer included in phase3.
  70 * (bug 28343) Unused preferences contextlines/contextchars have been removed
  71
  72 === New features in 1.18 ===
  73 * (bug 8130) Query pages should limit to content namespaces, not just main
  74   namespace.
  75 * Search suggestions (other than in the Vector skin) will now use the HTML5
  76   datalist feature where supported, currently only Firefox 4.
  77 * Special:Contribs now redirects to Special:Contributions.
  78 * (bug 6672) Images are now autorotated according to their EXIF orientation.
  79   This only affects thumbnails; the source remains unrotated.
  80 * (bug 25708) Update case mappings and normalization to Unicode 6.0.0
  81 * New hook ArticlePrepareTextForEdit added, called when preparing text to be
  82   saved.
  83 * New parser option PreSaveTransform added, allows the pre-save transformation
  84   to be selectively disabled.
  85 * Alternative to $wgHooks implemented, using the new Hooks class.
  86 * Add width parameter to Special:Filepath to allow getting the file path of a
  87   thumbnail.
  88 * (bug 26870) Add size to {{filepath:}}.
  89 * Upload warnings now show a thumbnail of the uploaded file.
  90 * Introduced the edittools-upload message, which will be inserted under the
  91   upload form instead of edittools if available.
  92 * (bug 26285) Extensions will be automatically generated on upload if the user
  93   specified a filename without extension.
  94 * (bug 26851) Special:UserRights now allows to prefill the reason field
  95 * New maintenance script to fix double redirects
  96   (maintenance/fixDoubleRedirects.php).
  97 * (bug 23315) New body classes to allow easier styling of special pages.
  98 * (bug 27159) Make email confirmation code expiration time configurable.
  99 * CSS/JS for each user group is imported from MediaWiki:Sysop.js,
 100   MediaWiki:Autoconfirmed.css, etc.
 101 * (bug 24230) Uploads of ZIP types, such as MS Office or OpenOffice can now be
 102   safely enabled. A ZIP file reader was added which can scan a ZIP file for
 103   potentially dangerous Java applets. This allows applets to be blocked
 104   specifically, rather than all ZIP files being blocked.
 105 * (bug 2429) Allow selection of associated namespace in recent changes.
 106 * (bug 26217) File size is now checked before uploading in HTML5 browsers.
 107 * CSS stylesheet MediaWiki:Noscript.css is now loaded for users with JavaScript
 108   disabled (enclosed in the head in a <noscript> tag).
 109 * Added UserGetLanguageObject hook to change the language used in $wgLang.
 110 * (bug 14645) When $wgMiserMode is on, expensive special pages are styled
 111   differently (italicized by default) on Special:SpecialPages.
 112 * Added $wgAggregateStatsID, which allows UDP stats to be aggregated over
 113   several wikis.
 114 * When $wgAllowMicrodataAttributes is true, all itemtypes are allowed, not just
 115   the three that were defined in the original specification.
 116 * (bug 14706) Added support for the Imagick PHP extension.
 117 * (bug 18691) Added support for SVG rasterization using the Imagick PHP
 118   extension.
 119 * (bug 2581, bug 6834) Added links to thumbnail in several resolutions to the
 120   file description page. The sizes are set by $wgImageLimits.
 121 * (bug 28031) Add pageCount support to ArchivedFile.
 122 * (bug 27924) PhpHttpRequest doesn't return response body if HTTP != 200.
 123 * Added hook BitmapHandlerTransform to allow extension to transform a file
 124   without overriding the entire handler.
 125 * The parser now attempts to output markers for editsection tokens and defer the
 126   rendering of them post-cache to reduce parser cache fragmentation and ensure
 127   skin customizability of edit section links.
 128 * (bug 24755) AuthPlugin auto-creation of local accounts can now be aborted by
 129   other extensions by handling the 'AbortAutoAccount' hook, similar to the
 130   'AbortNewAccount' triggered by explicit account creations. (They are separate
 131   to avoid loops and confusion; auth plugins like CentralAuth need to handle
 132   AbortNewAccount separately.
 133 * Special:ListFiles is now transcludable.
 134 * (bug 13879) Special:Emailuser asks for suitable target user if called without.
 135 * (bug 16956) IPTC and XMP metadata now extracted from images.
 136 * (bug 23816) A tracking category is now added for any pages with broken images.
 137
 138 === Bug fixes in 1.18 ===
 139 * (bug 23119) WikiError class and subclasses are now marked as deprecated.
 140 * (bug 10871) Javascript and CSS pages in MediaWiki namespace are no longer
 141   treated as wikitext on preview.
 142 * (bug 22753) Output from update.php is more clear when things changed, entries
 143   indicating nothing changed are now all prefixed by "...".
 144 * Page existence is now not revealed (in the colour of the tabs) to users who
 145   cannot read the page in question.
 146 * (bug 19006) {{REVISIONUSER}} no longer acts like {{CURRENTUSER}} in some
 147   cases.
 148 * (bug 16019) $wgArticlePath = "/$1" no longer breaks API edit/watch actions.
 149 * (bug 18372) File types blacklisted by $wgFileBlacklist will no longer be shown
 150   as "Permitted file types" on the upload form.
 151 * (bug 26379) importImages.php gives more descriptive error message on failure.
 152 * (bug 26410) + signs are no longer treated as spaces in internal links if
 153   link has a % sign in it.
 154 * (bug 26412) Search results headers no longer show a bogus edit link.
 155 * (bug 26540) Fixed wrong call to applyPatch in MysqlUpdater.
 156 * (bug 26574) Added 'upload' to $wgRestrictionTypes, allowing upload protected
 157   pages to be queried via the API and Special:ProtectedPages, and allowing
 158   disabling upload protection by removing it from $wgRestrictionTypes.
 159 * If an edit summary exceeds 250 bytes and is truncated, add an ellipse.
 160 * (bug 26638) Database error pages display correctly in RTL languages.
 161 * (bug 26187) Confirmrecreate no longer parses the edit summary.
 162 * (bug 25506) Exception is thrown if OutputPage::parse is called inside a tag
 163   hook, which would reset parser state.
 164 * (bug 26208) Mark directionality of some interlanguage links.
 165 * (bug 26034) Make the "View / Read" tab in content_navigation style tabs remain
 166   selected when the action is "purge".
 167 * (bug 14267) Support a MediaWiki:Mainpage-nstab override for the subject
 168   namespace tab on the mainpage of a wiki.
 169 * (bug 10158) Do not mention allowing others to contact you when the feature
 170   is disabled ($wgEnableUserEmail=false).
 171 * (bug 26733) Wrap initial table creation in transaction.
 172 * (bug 26729) Category pages should return 404 if they do not exist and have no
 173   members.
 174 * (bug 2585) Image pages should send 404 if no image, no shared image and no
 175   description page.
 176 * Custom editintro's using the editintro url parameter will no longer show
 177   <noinclude> sections on pages they are included on.
 178 * (bug 26449) Keep underlines from headings outside of tables and thumbs by
 179   adding overflow:hidden to h1,h2,h3,h4,h5,h6 (also fixes editsection bunching).
 180 * (bug 26708) Remove background-color:white from tables in Monobook and Vector.
 181 * (bug 28422) Remove color:black from tables in Monobook and Vector. And add it
 182   to table.wikitable instead.
 183 * (bug 26781) {{PAGENAME}} and related parser functions escape their output
 184   better.
 185 * (bug 26716) Provide link to instructions for external editor related
 186   preferences and add a comment to the ini control file explaining what is
 187   going on.
 188 * Trying to upload a file with no extension or with a disallowed MIME type now
 189   gives the right message instead of complaining about a MIME/extension
 190   mismatch.
 191 * (bug 26809) Uploading files with multiple extensions where one of the
 192   extensions is blacklisted now gives the proper extension in the error message.
 193 * (bug 26961) Hide anon edits in watchlist preference now actually works.
 194 * (bug 19751) Filesystem is now checked during image undeletion.
 195 * Send last modified headers for Special:Recentchanges when RC patrol is
 196   enabled, but user cannot see rc patrol links.
 197 * (bug 26548) ForeignAPIRepo (InstantCommons) now works with PDF files
 198   and other multi-paged file formats.
 199 * Files with a mime type that does not match the extension are now properly
 200   thumbnailed.
 201 * (bug 27201) Special:WhatLinksHere output no longer contains duplicate IDs.
 202 * (bug 15905) Nostalgia skin could become more usable by including a Talk:
 203   link at the top of the page.
 204 * (bug 27560) Search queries no longer fail in Walloon language.
 205 * (bug 27679) Broken embedded files with special characters are no longer
 206   double HTML escaped.
 207 * (bug 27700) The upload protection can now also be set for files that do not
 208   exist.
 209 * (bug 27763) Article::getParserOutput() no longer throws a fatal given when an
 210   incorrect revision ID is passed.
 211 * Trim the form field for uploading by url to remove extra spaces which could
 212   cause confusing error messages.
 213 * (bug 27854) Http::isValidURI is way too lax.
 214 * Do not show enotifminoredits preference, if disabled by $wgEnotifMinorEdits.
 215 * AbortLogin returning "ABORTED" now handled.  Also allows message identifier
 216   for "ABORTED" reason to be returned and displayed to user.
 217 * (bug 28034) uploading file to local wiki when file exists on shared repository
 218   (commons) gives spurious info in the warning message.
 219 * Usernames get lost when selecting different sorts on Special:listfiles.
 220 * (bug 14005) editing section 0 of an existing but empty page gives no such
 221   section error.
 222 * (bug 26939) Installer does not set $wgMetaNamespace.
 223 * (bug 28166) UploadBase assumes that 'edit' and 'upload' rights are not per
 224   page restrictions.
 225 * Make truncate function automatically consider length of '...' string,
 226   since length can vary by localization.
 227 * (bug 28242) Make redirects generated by urls containing a local interwiki
 228   prefix be a 301 instead of a 302.
 229 * (bug 15641) blocked administrators are now prevented from deleting or
 230   protecting their own talk page; and all blocked users are more
 231   comprehensively prevented from performing other actions.
 232 * (bug 27893) Edit-on-doubleclick now applies only on view and purge actions;
 233   no longer triggers unexpectedly on delete, history etc.
 234 * (bug 28417) Fix PHP notice when importing revision without a listed id.
 235 * (bug 28430) Make html and TeX output of <math> always be left-to-right.
 236 * (bug 28306) Fix exposure of suppressed usernames in ForeignDBRepo.
 237 * (bug 28372) Fix bogus link to suppressed file versions in ForeignDBRepo.
 238 * (bug 27473) Fix regression: bold, italic no longer interfere with linktrail
 239   for ca, kaa.
 240 * (bug 28444) Fix regression: edit-on-doubleclick retains revision id again.
 241 * &apos; character entity is now allowed in wikitext.
 242 * UtfNormal::cleanUp on an invalid utf-8 sequence no longer returns false if
 243   intl installed.
 244 * (bug 28561) The css class small will no longer make nested elements even
 245   smaller.
 246 * (bug 13172) Array type exif data (like GPS) was not being extracted from
 247   images.
 248 * (bug 28532) wfMsgExt() and wfMsgWikiHtml() use $wgOut->parse()
 249 * (bug 16129) Transcluded special pages expose strip markers when they output
 250   parsed messages.
 251 * (bug 27249) "Installed software" table in Special:Version should always be
 252   left-to-right.
 253 * (bug 28719) Do not call mLinkHolders __destruct explicitly
 254 * (bug 21196) Article::getContributors() no longer fails on PostgreSQL.
 255 * (bug 28752) XCache doesn't work in CLI mode.
 256 * (bug 28076) Thumbnail height limited to 360 pixels on Special:Listfiles
 257
 258 === API changes in 1.18 ===
 259 * (bug 26339) Throw warning when truncating an overlarge API result.
 260 * (bug 14869) Add API module for accessing QueryPage-based special pages.
 261 * (bug 14020) API for Special:Unwatchedpages.
 262 * (bug 24287) Wrap API Help output at 100 characters.
 263 * Add a realname uiprop option to query=userinfo so a user's realname can be
 264   extracted.
 265 * Add a &watchuser option to ApiBlock.
 266 * (bug 26541) Generator-ise ApiQueryRecentChanges.
 267 * action=parse now correctly returns an error for nonexistent pages.
 268 * (bug 25767) Add userrights properties to allusers and users query lists.
 269 * (bug 26558) list=allusers auprop=groups does not list groups a user is
 270   automatically a member of.
 271 * (bug 26559) list=allusers auprop=rights does not match
 272   list=users usprop=rights.
 273 * (bug 26560) On allusers if limit < total number of users, last user gets
 274   duplicate.
 275 * (bug 25135) add "normalized" to action=parse.
 276 * (bug 26460) Add support for listing category members by category pageid.
 277 * (bug 26482) add a imimages param to prop=images.
 278 * (bug 26498) allow LinksUpdate with API.
 279 * (bug 26485) add a elextlinks param to prop=extlinks.
 280 * (bug 26483) add a iwtitles param to prop=iwlinks.
 281 * (bug 26484) add a lltitles param to prop=langlinks.
 282 * (bug 26480) add a pppageprops param to prop=pageprops.
 283 * (bug 26650) Remove $wgAPICacheHelp in favour of $wgAPICacheHelpTimeout.
 284 * (bug 24650) Fix API to work with categorylinks changes.
 285 * Expose list of skins in meta=siteinfo.
 286 * (bug 26548) Add iiurlparam param to query=imageinfo and query=stashimageinfo.
 287 * (bug 27205) aiprop=metadata and aiprop=parsedcomment need help text.
 288 * Add a amtitle param to meta=allmessages.
 289 * (bug 25832) query=allimages now outputs ns/title as well.
 290 * (bug 27199) Thumbnail urls can be fetched for old files as well.
 291 * (bug 27376) when using ApiBase::PARAM_TYPE => 'integer' without a min or
 292   max value, API doesn't validate the input is actually an integer.
 293 * (bug 27479) API error when using both prop=pageprops and
 294   prop=info&inprop=displaytitle.
 295 * (bug 27554) Update API information text to reflect change in bug 26125.
 296 * (bug 27611) list=blocks: Use ipb_by_text instead of join with user table.
 297 * (bug 27616) Add userid of blocked user and blocker to list=blocks.
 298 * (bug 27688) Simplify queries to list user block information.
 299 * (bug 27708) list=users does not have a property to return user id.
 300 * (bug 27715) imageinfo didn't respect revdelete.
 301 * (bug 27862) Useremail module didn't properly return success on success.
 302 * (bug 27590) prop=imageinfo now allows querying the media type.
 303 * (bug 27587) list=filearchive now outputs full title info.
 304 * (bug 27018) Added action=filerevert to revert files to an old version.
 305 * (bug 27897) list=allusers and list=users list hidden users.
 306 * (bug 27717) API's exturlusage module does not respect $wgMiserMode.
 307 * (bug 27588) list=filearchive&faprop=sha1 returns empty attribute.
 308 * (bug 28010) Passing a non existant user to list=users gives internal error.
 309 * (bug 27549) action=query&list=users&usprop=groups doesn't show implicit
 310   groups if a user doesn't have explicit groups.
 311 * (bug 27670) Ordering by timestamp (and usage of start and end) isn't as clear
 312   in auto generated document, as it is on mw.org.
 313 * (bug 27182) API: Add filter by prefix for meta=allmessages.
 314 * (bug 27183) API: Add filter by customisation state for meta=allmessages.
 315 * (bug 27340) API: Allow listing of "small" categories.
 316 * (bug 27342) Add audir param to list=allusers.
 317 * (bug 27203) add fato param to list=filearchive.
 318 * (bug 27341) Add drto param to list=deletedrevs.
 319 * (bug 26630) Add API for Special:ActiveUsers.
 320 * (bug 27020) API: Allow title prefix search of logevents (only when not in
 321   miser mode).
 322 * (bug 26629) add Special:MIMESearch to API.
 323 * (bug 27585) add pagecount to list=filearchive.
 324 * (bug 28104) Namespace for local pages in interwiki backlinks (iwbacklinks)
 325   is missing.
 326 * (bug 27343) Add parseddescription to list=filearchive.
 327 * (bug 27469) label implicit groups in list=allusers&auprop=groups/
 328   list=users&usprop=groups.
 329 * Addition of APIQuerySiteInfoGeneralInfo hook to add extra information to
 330   the general site info results.
 331 * (bug 16288) API: consider making closure status of wikis more clear
 332   with meta=siteinfo.
 333 * (bug 27589) list=allimages&aiprop=archivename is useless.
 334 * (bug 27586) Remove duplication of props in ApiQueryStashImageInfo
 335   by using ApiQueryImageInfo.
 336 * (bug 28226) prop=extlinks&eloffset should be an integer.
 337 * (bug 28070) Fix watchlist RSS for databases that store timestamps in a
 338   real timestamp field.
 339 * API upload errors may now return the parameter that needs to be changed and
 340   a sessionkey to fix the error.
 341 * (bug 28249) allow dupes in meta=allmessages&amargs.
 342 * (bug 28263) cannot import xml with the API, when have not "import" user
 343   right, but "importupload".
 344 * (bug 28365) Added description for uiprop=preferencestoken in meta=userinfo.
 345 * (bug 28394) Set forgotten parameters types in ApiUnblock.
 346 * (bug 28395) Set forgotten parameters types in ApiParse.
 347 * (bug 28368) add hint for multipart/form-data to API information of
 348   action=import&xml=.
 349 * (bug 28391) action=feedwatchlist&allrev should be a bool.
 350 * (bug 28364) add registration date to meta=userinfo.
 351 * (bug 28254) action=paraminfo: Extract type from PARAM_DFLT if
 352   PARAM_TYPE is not set.
 353 * (bug 27712) add parent_id to list=deletedrevs.
 354 * (bug 28455) Add 'toponly' to recentchanges API module.
 355 * (bug 26873) API: Add 'toponly' filter in usercontribs module.
 356 * (bug 28586) YAML: strings that are the same as boolean literals.
 357 * (bug 28591) Update/replace/supplement spyc (YAML parsing library).
 358 * YAML API output is now 1.2 compliant, using JSON as the formatter.
 359 * (bug 28672) give information about misermode on API.
 360 * (bug 28558) Add iw_api and iw_wikiid to meta=siteinfo&siprop=interwikimap
 361 * (bug 26882) Allow listing of indefinite protections with the API.
 362 * (bug 27344) add drprefix param to list=deletedrevs.
 363 * (bug 28560) list=deletedrevs should die, if combination of param is invalid.
 364 * (bug 28238) paraminfo: output both limits for multi param
 365 * (bug 27179) API: List of extension tags through meta=siteinfo
 366 * Get a list of function hooks through meta=siteinfo
 367 * Get a list of all subscribed hooks, and those subscribers
 368 * (bug 28225) Allow hiding of user groups in list=allusers
 369 * (bug 27185) API: Add Special:ComparePages
 370 * (bug 28265) allow outputting of comments for action=expandtemplates
 371
 372 === Languages updated in 1.18 ===
 373
 374 MediaWiki supports over 330 languages. Many localisations are updated
 375 regularly. Below only new and removed languages are listed, as well as
 376 changes to languages because of Bugzilla reports.
 377
 378 * Angika (anp) (new).
 379 * Brahui (brh) (new).
 380 * Central Dusun (new).
 381 * Jamaican Creole English (jam) (new).
 382 * Khowar (khw) (new).
 383 * Liv (liv) (new).
 384 * Tokipona (tp) (removed) 'tokipona' is still  valid.
 385 * (bug 17160) Gender specific display text for User namespace.
 386 * Link trail added for sl and sh.
 387 * (bug 27633) Add characters to linkTrail for Potuguese (pt and pt-br).
 388 * (bug 27426) Set $namespaceGenderAliases for Arabic (ar).
 389 * (bug 27385) Set Polish $namespaceGenderAliases.
 390 * (bug 27681) Set $namespaceGenderAliases for Portuguese (pt and pt-br).
 391 * (bug 27785) Fallback language for Kabardian (kbd) is English now.
 392 * (bug 27825) Raw watchlist edit message now uses formatted numbers.
 393 * (bug 28040) Turkish: properly lower case 'I' to 'ı' (dotless i) and
 394   uppercase 'i' to 'İ' (dotted i).
 395 * Conversion script between Syllabics and Latin for the Inuktitut language.
 396 * Date formats for Indonesian (id) updated.
 397
 398 == Compatibility ==
 399
 400 MediaWiki 1.18 requires PHP 5.2.3. PHP 4 is no longer supported.
 401
 402 MySQL 3.23.x is no longer supported; some older hosts may need to upgrade.
 403 At this time we still recommend 4.0, but 4.1/5.0 will work fine in most cases.
 404
 405 == Upgrading ==
 406
 407 1.18 has several database changes since 1.17, and will not work without schema
 408 updates.
 409
 410 If upgrading from before 1.11, and you are using a wiki as a commons reposito-
 411 ry, make sure that it is updated as well. Otherwise, errors may arise due to
 412 database schema changes.
 413
 414 If upgrading from before 1.7, you may want to run refreshLinks.php to ensure
 415 new database fields are filled with data.
 416
 417 If you are upgrading from MediaWiki 1.4.x or earlier, some major database
 418 changes are made, and there is a slightly higher chance that things could
 419 break. Don't forget to always back up your database before upgrading!
 420
 421 See the file UPGRADE for more detailed upgrade instructions.
 422
 423 === Caveats ===
 424
 425 Some output, particularly involving user-supplied inline HTML, may not
 426 produce 100% valid or well-formed XHTML output. Testers are welcome to
 427 set $wgMimeType = "application/xhtml+xml"; to test for remaining problem
 428 cases, but this is not recommended on live sites. (This must be set for
 429 MathML to display properly in Mozilla.)
 430
 431 For notes on 1.17.x and older releases, see HISTORY.
 432
 433 === Online documentation ===
 434
 435 Documentation for both end-users and site administrators is currently being
 436 built up on MediaWiki.org, and is covered under the GNU Free Documentation
 437 License (except for pages that explicitly state that their contents are in
 438 the public domain):
 439
 440         http://www.mediawiki.org/wiki/Documentation
 441
 442 === Mailing list ===
 443
 444 A MediaWiki-l mailing list has been set up distinct from the Wikipedia
 445 wikitech-l list:
 446
 447         http://lists.wikimedia.org/mailman/listinfo/mediawiki-l
 448
 449 A low-traffic announcements-only list is also available:
 450
 451         http://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
 452
 453 It's highly recommended that you sign up for one of these lists if you're
 454 going to run a public MediaWiki, so you can be notified of security fixes.
 455
 456 === IRC help ===
 457
 458 There's usually someone online in #mediawiki on irc.freenode.net.