PL/I: Programming Language One
Descendants of PL/I (Pli Language), arguably including SQL.
PL/I derivatives include:
PL.8 (Pl Dot Eight): PL/I subset for the IBM 801 research RISC microprocessor.
PL/AS: reportedly the successor to PL/S (Pls Language).
PL/C: a PL/I subset designed at Cornell University specifically for students (S. Worona &al.: User's Guide to PL/C, Cornell U., June 1974; H.L. Morgan &al.: "PL/C: A High Performance Compiler". Proceedings of the SJCC, AFIPS 38:503-510 (1971)).
PL/M (Programming Language/Microcomputers): a PL/I subset for Intel microprocessors.
PL/S (Pls Language): the IBM programming Language [for] Systems, but only for IBM internal use, which was customarily used with its interleaved generated S/370 assembly code.
PL/SQL (Pl Sql). Answer Me: Is it really PL/I derived, or is just the name so (making it PL/I deprived)?
PLUM: teaching & research subset of PL/I for the Univac 1100 at U. of Maryland (M[arvin] V. Zelkowitz: PL/I Programming with PLUM, Paladin House, 1978).
PL/X: reportedly the successor to PL/S (Pls Language) and PL/AS, still officially only for IBM internal use, but with the distinction of being Object Oriented.
PL/Z: a PL/I subset for Zilog microprocessors, most intriguingly for the Z8000.
Rexx (Rexx Language)
I first heard of Rexx in 1988, but I never heard that it was derived from PL/I, and I really think I would remember if I had heard that. Can this be confirmed? Sorry, I don't see much relationship between PL/I and Rexx - Rexx was designed as a much more powerful replacement for a scripting language in common use on IBM mainframes called EXEC2 language. It was later extended to other platforms. It does share the convention for comment statements with PL/I, but that's about all!
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