These two could use a thread of thier own, but hey, why tramp all over precious *real estate.

A prescriptivist is just a descriptivist who is describing a limited (and often obsolete) subset of the language.

Or sometimes just an imaginary dialect.

Then one can't be one without the other and we should just call all of us "rescriptivists", which is, Shirley, the intention of both... er... all.