SGMLfamily
SGMLfamily refers to the set of markup languages that are defined by, or derive from, the Standard Generalized Markup Language (SGML). It is not a formal standard, but a descriptive umbrella used in documentation and discussion to describe SGML-based ecosystems, including SGML, XML, and XML-derived languages, as well as various SGML-inspired publishing languages such as DocBook and TEI.
SGML, specified by ISO 8879 (1986), introduced the concepts of a document type definition (DTD), elements, attributes,
Common members include SGML itself, XML (and XML-based languages such as XHTML), and document grammars used in
Impact and usage: The SGMLfamily has been central to large-scale documentation, data interchange, and digital libraries.