&$user: the user that deleted the article
$reason: the reason the article was deleted
$id: id of the article that was deleted
-$content: the Content of the deleted page
+$content: the Content of the deleted page (or null, when deleting a broken page)
$logEntry: the ManualLogEntry used to record the deletion
$archivedRevisionCount: the number of revisions archived during the deletion
specific to a content model should be provided by the respective Content's
getDeletionUpdates() method.
$page: the WikiPage
-$content: the Content to generate updates for
+$content: the Content to generate updates for (or null, if the Content could not be loaded
+due to an error)
&$updates: the array of DataUpdate objects. Hook function may want to add to it.
'XmlDumpWriterOpenPage': Called at the end of XmlDumpWriter::openPage, to allow