SGML
SGML means Standard Generalized Markup Language.
Contents |
[edit] Overview
It is an early standard for defining Markup to use in documents. It is very generalized and can be used to define all kinds of markups. XML is a specific implementation of SGML. Framemaker also has a markup language called MIF. Technically an XHTML document is an SGML.
Files conforming to SGML can have any extension. Generically the extension could be .SGM or .SGML
[edit] Requirements
A conforming SGML document must be either a type-valid SGML document, a tag-valid SGML document, or both.
[edit] A type-valid SGML document
An SGML document in which, for each document instance, there is an associated document type declaration (DTD) to whose DTD that instance conforms.
[edit] A tag-valid SGML document
An SGML document, all of whose document instances are fully tagged. There need not be a document type declaration associated with any of the instances. If there is a document type declaration, the instance can be parsed with or without reference to it.
[edit] For more information
http://en.wikipedia.org/wiki/Standard_Generalized_Markup_Language
