Instructors who would prefer that their students use a strongly-typed language such as ML or OCAML will find that the algorithms in the book are easy to rewrite in such a language. We have added to Scheme a new special form, define-datatype, that is very similar to ML's datatype or OCAML's type. With the use of our matching form, cases, the programs are structured much as they would be in ML or OCAML.

We rely on a Scheme-based parser generator, SLLGEN. It should be straightforward to port our lexical and grammatical specifications to an ML-based parser generator such as mllex/mlyacc or to ocamllex/ocamlyacc, or to write the parsers by hand