Comment on the Composition of Semantics in Algol 68 CACM August, 1972 van der Poel, W. L. programming primitives, programming languages, Algol, semantics, recursive composition, design of programming languages, data structures 1.3 4.2 4.22 5.23 5.24 CA720807 JB January 30, 1978 9:29 AM 2295 5 2295 2295 5 2295 2295 5 2295