;;; Types

;;; answer to exercise 3.5.10 - 3 
;;; AV - modified

syn-struc := *top* &
[ CATEG cat,
  ORTH *top* ].

cat := *top*.

s := cat.

np := cat.

vp := cat.

det := cat.

n := cat.

;;; answer to exercise 3.5.10 - 3 
;;; AV - modified

phrase := syn-struc &
[ ORTH *top*,
  ARGS *list* ].

word := syn-struc &
[ ORTH string ].

string := *top*.

*list* := *top*.

*ne-list* := *list* &
 [ FIRST *top*,
   REST *list* ].

*null* := *list*.