The Vienna 2004 model is a mirror of the Turner data structure. The difference is that The ViennaRNA package uses an explicit annotation for RNA basepairs.
Furthermore, all energies are stored in parts of 1/100, using Ints instead of Doubles.
Documentation
data Vienna2004 Source
type PNN = (ViennaPair, Nuc, Nuc)Source
type PN = (ViennaPair, Nuc)Source