a man bent down gathering books.
The man is working at the library.
Just because the man is gathering books does not mean he's working in a library.
exists x1 x2 x3 x4.(a_topic(x1) & down(x1,x3) & n_book(x3) & of(x3,x4) & n_gathering(x4) & n_bent(x1) & of(x1,x2) & n_man(x2))
exists e1 x1 x2.(n_library(x2) & n_man(x1) & at(e1,x2) & Actor(e1,x1) & v_work(e1))