[...]
> I thought of using polymorphic variant types, but my (limited)
understanding
> is that you either declare all possible variants straight up in the .mli
file
> (which totally defeats my purpose) or you don't declare anything and let
the
> compiler infer the type (which I don't know how to write into a .mli
file).
> If this can be done with polymorphic variants, how would I do it?
> Alternatively, if this can be done with objects, how would I do it?  Or
> should I just stick with abusing exceptions?

There is a nice paper from Jacques Garrigue about extensions using
polymorphic variants.
"Code reuse through polymorphic variants. "
http://wwwfun.kurims.kyoto-u.ac.jp/~garrigue/papers/
That might be what you're loooking for.

Regards,
Nicolas Cannasse

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