[Zope] ExtensionClass

[cpita]

Hi!

I have an ExtensionClass(es) question and, being the 
latest releases of them distributed with Zope, I 
decided to ask it here.

Situation:

1) Class A subclasses 2+ extension classes E = 
{E1,...,En} and perhaps another non extension classes C 
= {C1,...,Cm}. That is, class A(B1,...,Bk): ...., where 
B1,...,Bk are each in E or in C.
2) a is an instance of A (a = A())
3) a.foo(bar) is invoked
4) getattr is invoked in the first extension class in 
the inherited classes list (i.e. the first Bi belonging 
to E)

Question:

What happens then?
I guess that calling Py_FindMethod (inside getattr 
implementation) will trigger a search in instance and 
base classes' dictionaries, but what about the other 
extension base classes and what about the searching 
order?
I can't find any doc on these, so I'm needing your help.

Thank you, Carlos.

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