This extension hook has no documentation on MediaWiki.org. Please improve MediaWiki by adding documentation to it. See Template:ExtensionHook for instructions on how to do it.

For examples of extensions using this hook, see Category:NamespaceManager::getNamespaceData extensions . Category:Extension hooks#NamespaceManager::getNamespaceData Category:Undocumented extension hooks#NamespaceManager::getNamespaceData Category:Extension hooks provided by BlueSpiceNamespaceManager Category:Extension hooks#NamespaceManager::getNamespaceData Category:Undocumented extension hooks#NamespaceManager::getNamespaceData Category:Extension hooks provided by BlueSpiceNamespaceManager