is mentioned by

Thm* es:ES, e:E, l:IdLnk, tg:Id. Thm* kind(e) = rcv(l; tg) Thm*  Thm* loc(e) = destination(l) & loc(sender(e)) = source(l)	[es-loc-rcv]
Def act(e) == act(kind(e))	[es-act]
Def lnk(e) == lnk(kind(e))	[es-lnk]
Def tag(e) == tag(kind(e))	[es-tag]
Def isrcv(e) == isrcv(kind(e))	[es-isrcv]

Try larger context: EventSystems IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html