[Haskell-cafe] Haskell's type system

I'm trying to wrap my head around the theoretical aspects of haskell's type system. Is there a discussion of the topic separate from the language itself? Since I come from a rather logic-y background, I have this (far-fetched) hope that there is a translation from haskell's type syntax to first order logic (or an extension there-of). Is this done? Doable? -Ron