Are there plans to include a semantic description of Scheme in the SIGPLAN report? If the denotational semantics is completed, I would very much like to see Scheme presented with it. John P.S. In my opinion: 1) #t and #f are preferable over #!true and #!false. 2) Its good to include the boolean? predicate. 3) Local defines should be an alternate syntax for LETREC as advocated by Bill.