I've been pecking at an internet draft for GxSE, but I'm not sure I'll be done with it before London. What I can do, though, is put together some slides with the basic mechanism and use that to lead a *small* bar bof if there is interest. The goal of the BOF would be to flesh out the design a bit, figure out the pros and cons, and decide if it is something worth pursuing. Any interest? PF