There are some new globals that can be used to control the behavior of the ContentHandler facility:
-* $wgContentHandlers associates content model IDs with the names of the appropriate ContentHandler subclasses.
+* $wgContentHandlers associates content model IDs with the names of the appropriate ContentHandler subclasses
+ or callbacks that create an instance of the appropriate ContentHandler subclass.
* $wgNamespaceContentModels maps namespace IDs to a content model that should be the default for that namespace.