[Zope3-dev] Why this set of interfaces ?

[Pupeno]

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) ?
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.
-- 
Pupeno <pupeno at pupeno.com> (http://pupeno.com)
Reading ? Science Fiction ? http://sfreaders.com.ar
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