"Marker interface" is the right idea (and I did in fact look it up in Wikipedia last night :-)), but I was trying to avoid saying that. What my stuff is doing is arguably a little different: a Java analogy would be something like defining a new interface that's a composite of several other interfaces. This feels slightly (maybe very slightly) more elevated than simply annotating a class, which is more or less how I'd say marker interfaces tend to be used. It all comes to the same thing in the end, though. Point is, zero-method protocols are occasionally a useful tool.
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