recursion, the former rule should be modified as Xn -> … Xm … (where m = n, or n-1)◎ Feature-based ... Syntax- Feature-based Syntax, why?Distribution of phrases (i.e. In some sentence-positions, a wide range ... as sets of syntactic features (e.g. V=[+V, -N]; N=[-V, +N]; A=[+V, +N]; P=[-V, -N])- Further