Before revision: It can be used in information systems such as database applications.ISO catalog entry for ISO/IEC 5218:2004 Information technology — Codes for the representation of human sexes The four codes specified in ISO/IEC 5218 are: 0 = Not known; 1 = Male; 2 = Female; 9 = Not applicable.
After revision: <ref> ISO/IEC 5218 Standard free download ofIt can be used in information systems such as database applications.ISO catalog entry for ISO/IEC 5218:2004 Information technology — Codes for the representation of human sexes The four codes specified in ISO/IEC 5218 are: 0 = Not known; 1 = Male; 2 = Female; 9 = Not applicable.