@ExtraTypes({ EntityARevisionProxy.class, EntityBRevisionProxy.class })
@ProxyFor(Revision.class)
interface RevisionProxy extends EntityProxy { }

basically says: when a method in a RequestContext or proxy returns a 
RevisionProxy, it can actually be a EntityARevisionProxy or 
EntityBRevisionProxy (actually, those proxies are not bound to RevisionProxy 
because the annotation has been put there, but because they extend it)

Pro tip: when in doubt, have a look at the unit tests for the feature in the 
SVN repository.

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