WG17 completed work on part one of ISO/IEC 13211 Programming Language Prolog -- General Core in the Summer of 1995. It has since been published.
To obtain these international standards, please contact your national member body.
WG17 completed work on part 2 of the standard -- Modules -- in the summer of 1999. It has since been published.
Currently WG17 has a technical report on Definite Clause Grammars under preparation.
If you want further information, or want to participate, please contact your national member body or one of the contact addresses of the WG.