| Definitions |  x:A. B(x), P & Q, A  B, P   Q, Prop, t  T,   x. t(x), Y, if b t else f fi, Rnone?(x1), True, Rplus?(x1), Rplus-left(x1), Rplus-right(x1), P  Q, true, false, {T}, Realizer, Unit, x(s), left  right,  , , @loc x initially v:T, @loc only events in L change x:T, only events in L send on lnk with tag, @loc effect knd(v:T) x := f State(ds) v , sends knd(v:T) on l:tagged(g,State(ds),v):dt, @loc precondition for a(v:T):P State(ds) v, @loc: k writes only members of L, @loc: k sends only on links in L, @loc: only members of L read x |