This International Standard provides a file format and encodings for the storage and retrieval of GKS-94 Normalized Device Coordinate (NDC) pictures. It is an extension of the Computer Graphics Metafile, version 4 defined by ISO/IEC 8632:1992/Amd. 2:1995 (all parts).
DS/ISO/IEC 7942-2:1998 history
1998DS/ISO/IEC 7942-2:1998 Information technology - Computer graphics and image processing - Graphical Kernel System (GKS) - Part 2: NDC metafile