due to an error)
&$updates: the array of DataUpdate objects. Hook function may want to add to it.
+'WikiPageFactory': Override WikiPage class used for a title
+$title: Title of the page
+&$page: Variable to set the created WikiPage to.
+
'XmlDumpWriterOpenPage': Called at the end of XmlDumpWriter::openPage, to allow
extra metadata to be added.
$obj: The XmlDumpWriter object.