This part of 9636 defines those functions of the Computer Graphics Interface concerned with the creation, modification, and manipulation of graphic pictures using segments.
ANSI/INCITS/ISO/IEC 9636-4:1991 history
1991ANSI/INCITS/ISO/IEC 9636-4:1991 Information Technology - Computer Graphics - Interfacing Techniques for Dialogues with Graphical Devices (CGI) - Functional Specification - Part 4: Segments