gf-3.6: lib/src/experimental/NDPredEng.gf

concrete NDPredEng of NDPred = 
  CatEng [Ant,NP,Utt,IP,IAdv,IComp,Conj,RS,RP,Subj] **
    NDPredFunctor with 
      (PredInterface = PredInstanceEng),
      (Pred = PredEng) ;