Hello and happy new year!

Actually I was just writing this message to ask a question, but in the meantime I found the solution. So I'm posting it anyway in case it helps.

I have two independant classes Foo and Bar, defined in two different modules.

In the beginning, I want Foo to be a container for Bar,
with symetric containment constraints (contains and containers)

But in the future, I will probably want Bar to be contained in something else, so I don't want to hardcode the containment constraints.

Is there a solution for this problem? Can I define containment constraint with 

The solution is just to define a generic IBarContainer, and to define constraints on it. Then to tell Foo to implement IBarContainer in ZCML.

class IFoo(IContainer):
class IBar(Interface):
class IBarContainer(IContainer):

Then I must configure the class Foo to implement IBarContainer.
<zope:class class="Foo">
  <implements interface="IBarContainer">

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