[Zope3-dev] Why this set of interfaces ?

[Bernd Dorn]

Pupeno wrote:
> I am reading 
> http://www.zope.org/Wikis/DevSite/Projects/ComponentArchitecture/Zope3Book/contentobject.html 
> and I am wondering about the choice of interfaces. Why not just making an 
> interface IMessage(IContainer) (instead of IMessage(Interface)) and avoid 
> having to make IMessageContained(IContained) and 
> IMessageContainer(IContainer) ?

i think because of the preconditions - to define them you need IMessage 
defined, which would not be the case in the class definition of IMessage


> Now that I think about it, it should be IMessage(IContainer, IContained).
> At any rate, I believe the answer should make its way into the book.
> Thanks.
> 
> 
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