Tourists mingle on a street.
German tourists are talking about food.
You can't imply that the tourist were German or that they were talking about food. Tourist can be of any nationality and they could have been talking about anything.
exists e1 x1 x2.(on(e1,x2) & n_street(x2) & Actor(e1,x1) & v_mingle(e1) & n_tourist(x1))
exists e1 s1 x1 x2.(about(e1,x2) & n_food(x2) & Actor(e1,x1) & v_talk(e1) & n_tourist(x1) & a_german(s1) & Theme(s1,x1))