SGML

(Standard Generalized Markup Language) A markup language used to define document structure. Standard Generalized Markup Language (SGML) is an open document-definition language used frequently in the publishing industry. Document elements such as headings, subheadings, and body text are defined by different tags. SGML is an international standard, and SGML documents are application and platform independent. Hypertext Markup Language (HTML), a subset of SGML, is used to define documents for the World Wide Web.