Standard Generalized Markup Language
From CSS Discuss
SGML is the grandfather of both HTML and XML.
SGML is the root of most modern markup languages, but it's also such a behemoth that it's very difficult to implement fully-compliant SGML applications.
Simplified SGML + hyperlinks + document structure DTD = HTML.
Simplified SGML = XML.
SGML is defined in ISO8879, and can be yours for only $130 as of 1/2/2003.
