[Zope] [Search] Documentation for "__guarded_*__"

I am searching documentation for "__guarded_getattr__", "__guarded_setattr__" and friends. The name suggests they should guard. Thus a definition __guarded_getattr__= __getattr__ is probably not very wise. Is the following definition correct when I want the dynamic attributes (defined by "__getattr__") to be protected in the same way normal attributes are: def __guarded_getattr__(self,attr): r= getattr(self,attr) if getSecurityManager().validate(accessed=self, name=attr, value=r) return r raise Unauthorized, attr Dieter