Obligatory links: Rivest's proposal, with source code: http://people.csail.mit.edu/rivest/sexp.html http://people.csail.mit.edu/rivest/sexp.html McCarthy's Co

Obligatory links: Rivest's proposal, with source code: http://people.csail.mit.edu/rivest/sexp.html http://people.csail.mit.edu/rivest/sexp.html McCarthy's Common Business Communication Language: http://jmc.stanford.edu/articles/cbcl.html http://jmc.stanford.edu/articles/cbcl.html