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file extension SGM - Standard Generalized Markup Language IETF SGML document
File extension SGM description:
Standard Generalized Markup Language IETF Document
The Standard Generalized Markup Language (ISO 8879:1986 SGML) is an ISO Standard metalanguage in which one can define markup languages for documents. SGML is a descendant of IBM's Generalized Markup Language (GML), developed in the 1960s by Charles Goldfarb, Edward Mosher and Raymond Lorie (whose surname initials were used by Goldfarb to make up the term GML).
SGML provides an abstract syntax that can be implemented in many different concrete syntaxes. For instance, although it is the norm to use angle brackets as tag delimiters in an SGML document (per the reference concrete syntax defined in the standard), it is possible to use other characters instead, provided that a suitable concrete syntax is defined in the document's SGML declaration. For example, an SGML interpreter could be programmed to parse GML markup.
MIME type:
text/sgml
text/x-sgml
application/sgml
application/x-sgml