grouparchy.schema
zope.schema field events and directlyProvided fields
grouparchy.schema (README) provides some additional zope.schema fields and corresponding properties. EventProperty is a zope.schema FieldProperty that fires an event when the field is modified and sends the old and new values to the event. grouparchy.schema.interface includes zope.schema fields for manipulating the interfaces provided by the context.
This package is used throughout grouparchy itself and in grouaprchy.index.provider.

