T was adopted in 1986 as an international standard for the creation,management,storage,and delivry of information products.HTML and its possible successor,XML are both subsets of SGML.
SGML (Standard Graphics Markup Language )
SGML
Meaning of SGML in English
Internet terms and acronyms English vocab. Английский словарь Интернет терминов и сокращений. 2012