developed by ISO/IEC JTC 1/SC 34 (ISO/IEC Joint Technical Committee 1, Subcommittee 34 - Document description and processing languages) :

* SGML (ISO 8879) - Generalized markup language
** SGML was reworked in 1998 into XML, a successful profile of SGML. Full SGML is rarely found or used in new projects.
* DSSSL (ISO/IEC 10179) - Document processing and styling