The SGML file extension is related to the Standard Generalized Markup Language file format used to transport of documents in a format independent of the device, system or application.
There is one other file type using
the SGML file extension!
.sgml - Encoded Archival Description Document
SGML file extension - IETF SGML document file
What is sgml file? How to open sgml files?
File type specification:
The SGML file extension is associated with SGML - Standard Generalized Markup Language and used for files written in this language.
SGML is an international standard for the transport of documents in a format independent of the device, system or application and is constantly developed and revised.
HTML is an application of SGML, while XML is a metalanguage based on SGML, used for creating XML applications.
MIME: text/sgml, text/x-sgml, application/sgml, application/x-sgml