a person walks near a fence.
The fence is topped with barbed wire
Fence topped with barbed wire is the description of the fence . There is no mention of any person.
exists e1 x1 x2.(near(e1,x2) & n_fence(x2) & Actor(e1,x1) & v_walk(e1) & n_person(x1))
exists e1 s1 x1 x2.(n_fence(x1) & with(e1,x2) & n_wire(x2) & a_barbed(s1) & Theme(s1,x2) & Theme(e1,x1) & v_top(e1))