ISO/IEC 13211-1:1995 Preview
Information technology -- Programming languages -- Prolog -- Part 1: General core
This standard was last reviewed and confirmed* in 2008.
*Therefore this version remains current
Designed to promote the applicability and portability of Prolog text and data among a variety of data processing systems. Specifies: the representation of Prolog text; the syntax and constraints of the Prolog language; the semantic rules for interpreting Prolog text; the representation of input data to be processed by Prolog; the representation of output produced by Prolog and the restrictions and limits imposed on a conforming Prolog processor.