An early language for writing recursive descent compilers. It was macro
ed from the IBM 1604 to the IBM 709
to the IBM 7094
to the GE-635, where it was used by McIlroy and Morris to write the EPL
compiler for Multics
["TMG - A Syntax-Directed Compiler", R.M. McClure, Proc ACM 20th Natl Conf (1965)].
[Sammet 1969, p.636].