Translations:Manual:LocalSettings.php/98/en

By declaring $ExtraNamespaces, and modifying $NamespacesWithSubpages, and $NamespacesToBeSearchedDefault, extra namespaces can be added to a MediaWiki installation; and by declaring the $wgNamespaceAliases array namespace aliases can be added. Take heed not to have any pages already titled in that namespace, for instance if you had a page called "Technical:Support" and you created the Technical: namespace, then that page would not only be lost, but you cannot remove it from Special:Allpages. To fix this delete the namespace, move "Technical:Support" to "Support" in mainspace, delete the redirect, reinsert the namespace, and move it back to "Technical:Support". See Custom namespaces for more information as to how to do so.