Right, I need to be more explicit.  I would assume that a park skier learned to ski, can ski the black, can ski the trees, bumps, jump off of a 10 foot cornice until a advanced run (look at mammoth, they have double diamond that are about %40).
BUT, a park skier could theoretically just ski in the park his whole life and not even be able to get down a %40 runn with deep pow.  Are their any like this?