A woman is eating something in public.
A woman is eating a sandwich in a park.
Something does not imply sandwich.
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & Theme(s1,x3) & a_public(s1) & (x2 = x3) & n_thing(x2) & n_woman(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & in(x2,x3) & n_park(x3) & n_sandwich(x2) & n_woman(x1))