Don't be too impressed, I think I was way off base. Looks like just a
homomorphism:
http://en.wikipedia.org/wiki/Homomorphism

Chad

> > I wonder, is listify a contravariant functor?

> I wonder - will I ever reach the stage where I too make off-hand remarks
> like this? :-}

> Now I know how all the "normal" people feel when I tell them that a
> relation is simply a subset of the extended Cartesian product of the
> respective domains of its attributes...
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