what is the best way in zope3 to create a collection of interfaces without using classes, lists, etc.?

I have a number of interfaces that I'd like to group into a same interface category.

e.g. ISomeCollection  = I1, I2, I3, I4 ....

and I'd like to be able to query which interfaces ISomeCollection "contains". However I'd like not to instanciate a registry just to hold that type of information.

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