>In Tepa (and now Miapimoquitch) I've sidestepped the whole relative clause
>question by conflating all subordinate clauses into two types. The
>distinction made in subordinate clauses is whether the subject of the
>subordinate clause is the same as, or different from the subject of the main
>clause. This subordination strategy is called "switch reference" and is
>found in several Amerindian and Papuan languages. A brief explanation can be
>found at 
http://wiki.frath.net/Tepa_syntax#Subordination .
>
>I don't know of any other constructed languages that have switch reference
>systems; I'd be happy to see them if they're out there.