Comment #1 on issue 99 by optilude: Schema defined through XML with
plone.supermodel not marked with IContentType
http://code.google.com/p/dexterity/issues/detail?id=99
Thinking about this some more, it's not really desirable to do this. We
don't do it for other types (e.g. those
defined in Python) and I'm not sure a dependency on zope.app.content is all
that desirable, nor that
queryContentType/IContentType is particularly useful to us.