someone working in a restaurant that has dishes set out like a buffet.
They are at the buffet.
A buffet is a rephrasing of set out like a buffet.
exists e2 e3 e1 s1 x1 x2 x3 x4 x5 x6.(like(e3,x6) & n_buffet(x6) & a_out(s1) & Manner(e3,s1) & Theme(e3,x1) & v_set(e3) & in(e1,x3) & Theme(e2,x5) & Actor(e2,x4) & v_have(e2) & n_dish(x5) & (x3 = x4) & n_restaurant(x3) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_person(x1))
exists p1 x1 x2.(n_buffet(x2) & n_thing(x1) & at(x1,x2))