A band playing in the park.
A rock band playing in the park.
The band is not necessarily a rock band.
exists x1 x2 x3.(n_park(x3) & a_topic(x1) & in(x1,x3) & n_playing(x1) & of(x1,x2) & n_band(x2))
exists x1 x2 x3 x4.(n_park(x4) & a_topic(x1) & in(x1,x4) & n_playing(x1) & of(x1,x3) & n_band(x3) & of(x1,x2) & n_rock(x2))