A security guard on watch duty at the museum.
The museum holds valuable paintings and artifacts.
You can't simply imply that the museum is holding valuable paintings and artifacts.
exists x1 x2 x3 x4 x5.(n_museum(x5) & a_topic(x1) & on(x1,x3) & at(x3,x5) & n_duty(x3) & of(x3,x4) & n_watch(x4) & n_guard(x1) & of(x1,x2) & n_security(x2))
exists e1 s1 x1 x2 x3 x4.(n_museum(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_artifact(x4) & n_painting(x3) & subset_of(x4,x2) & subset_of(x3,x2) & a_valuable(s1) & Theme(s1,x2))