I think that we should allow context sets to define semantics for extraData in the response. For example, a context Set might say: If you send the relation modifier rel.CORI then you should be prepared to accept the <rel:rank> <rel:score> and <rel:rawScore> elements in extraTermData. I'm sure there's a better example, but here's at least one scenario that doesn't seem too far fetched where you wouldn't have extraRequestData, but would have extraData in the response. (Right?) Rob -- ,'/:. Dr Robert Sanderson ([log in to unmask]) ,'-/::::. http://www.o-r-g.org/~azaroth/ ,'--/::(@)::. Special Collections and Archives, extension 3142 ,'---/::::::::::. Nebmedes: http://nebmedes.o-r-g.org:8000/ ____/:::::::::::::. I L L U M I N A T I