Can an interface serve as proxy for more than one class in RequestFactory?

I have two domain objects that implement the same interface on the
server, and a third class that contains a (heterogeneous) List of
those objects. I need to be able to expose this list on the client
side. The domain objects do not share a common super-class (they
instead delegate the common functionality to another object).

Given that all proxy interfaces are required to extend BaseProxy, I
cannot figure out how to write multiple proxies that will have a
parent interface in common. I tried making a base interface that both
proxies extend, but that base interface must extend EntityProxy, and
the GWT compiler complains if you have an interface that extends
EntityProxy but does not have a ProxyFor annotation.

I am wondering (although I suspect the answer is no) whether I can
have a single interface declare that it is a proxy for multiple
entities. If not, other ideas for making this work are welcome.

Thanks in advance for any ideas.
Ryan

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