(By Bernard Comrie & Tania Kuteva): "Since many languages use different strategies for relativizing on different roles, we distinguish between relativization on subjects and relativization on obliques. Map 122A shows what strategies the languages of the world use to relativize on the subject. ❡
For Map 123A, we take into consideration the relativizing strategies the languages of the world employ with obliques, whereby we take the instrumental to be the prototypical case of obliques. In languages where we have no ready access to information about relativization on instrumentals, we consider other, comparable constructions: the comitative, the indirect object, the benefactive, the locative, etc. but not the possessive or the temporal. ❡
Note that the head noun may have different roles in the main clause and in the relative clause. Thus in the English sentence in (4), the head noun the girl functions as the object of the main clause, and the subject of the relative clause. (4) I like the girl who greeted us yesterday. ❡
For the purposes of both Map 122A and Map 123A, the role relevant to our classification is the one the head noun has within the relative clause. Accordingly, the example in (4) is an example of relativizing on the subject, since the head noun the girl functions as the subject of the relative clause."