Some definitions of interest.
Knd	Def Knd == (IdLnkId)+Id
	Thm* Knd  Type
IdLnk	Def IdLnk == IdId
	Thm* IdLnk  Type
Id	Def Id == Atom
	Thm* Id  Type
kindcase	Def kindcase(k;a.f(a);l,t.g(l;t)) Def == if islocal(k) f(act(k)) else g(lnk(k);tag(k)) fi
	Thm* B:Type, k:Knd, f:(IdB), g:(IdLnkIdB). Thm* kindcase(k;a.f(a);l,t.g(l,t))  B

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