

















   Purpose: Preprocessor for Definite Clause Slash Grammars
%   Needs  : append
member/2, memberchk/2.

/*  Definite Clause Slash Gammars are a special kin
 DCG which
    allows slash categories, e.g. s/np.
    A nonterminal wi
 arguments is translated into a predicate
    with N+4 arguments, 

X1,...,Xn) => nt(X1,...,Xn,T0,T,S0,S)
    where T0 is the "trac
efore and T that after parsing an nt,
    and S0 is the str



























































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































