Hi, I'd like to apply the attached patch to zope.interface trunk to make it more easily subclassable without having to copy and paste a chunk of its __init__ into the subclass' __init__. Motivating factor is: I need an Interface with a hook that gets called after InterfaceClass.__init__ to allow for: * Checking that field names supplied as tagged values from directives correspond to actual field names to detect typos. * Registering the Interface instance for further configuration to be executed by a zope.configuration action. (Subclass is http://dev.plone.org/plone/browser/plone.supermodel/branches/elro-directives...) Laurence