[Zope3-dev] Recursive containment constraints

[Dominik Huber]

Thanks Stephan, but I have to bother you with another lack of
understanding...

> No, it should still work. I did not change to another pattern 
> for technical 
> reasons.

Maybe I'm missing something. I thought declaring an attribute within
the interface declaration and extending an existing interface using
setTaggedValue respectively, should be equivalent.

So when I do the following examples I get different
results::

   Example 1: setTaggedValue way
   >>> class IFoo(Interface):
   ...   pass
   ...
   >>> IFoo.setTaggedValue('__parent__',
Field(constraint=ContainerTypesConstraint(IBar)))

   >>> IFoo.names()
   []

   Example 2: regular way
   >>> class IFoo(Interface):
   ...   __parent__ = Field(constraint=ContainerTypesConstraint(IBar))
   ...
   >>> IFoo.names()
   ['__parent__']

What is exactly the difference between those versions?

Regards,
Dominik Huber