A group of people on a walkway.
The people are outdoors.
A walkway is an outdoors.
exists x1 x2 x3.(a_topic(x1) & of(x1,x2) & on(x2,x3) & n_walkway(x3) & n_people(x2) & n_group(x1))
exists p1 x1.(n_people(x1) & exists x2.((x1 = x2) & n_outdoors(x2)))