Cornelis Hermanus Antonius "Kees" Koster (13 July 1943 – 21 March 2013)[1] was a Dutch computer scientist who was a professor in the Department of Informatics at the Radboud University Nijmegen in the Netherlands.

[2] Born in Haarlem, his family moved to Jakarta after the war.

He became involved with developing international standards in programming and informatics, as a member of the International Federation for Information Processing (IFIP) IFIP Working Group 2.1 on Algorithmic Languages and Calculi,[5] which specified, maintains, and supports the programming languages ALGOL 60 and 68.

In a sense, CDL is a deterministic executable affix grammar, while Prolog is a non-deterministic executable affix grammar; a link acknowledged by the implementors of the original Prolog interpreter.

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