ISO 8879:1986, Information processing - Text and office systems - Standard Generalized Markup Language (SGML)

This International Standard:Specifies an abstract syntax known as the Standard Generalized Markup Language (SGML). The language expresses the description of a document's structure and other attributes, as well as other information that makes the markup interpretable.Specifies a reference concrete syntax that binds the abstract syntax to specific characters and numeric values, and criteria for defining variant concrete syntaxes.Defines conforming documents in terms of their use of components of the language.Defines conforming systems in terms of their ability to process conforming documents and to recognize markup errors in them.Specifies how data not defined by this International Standard (such as images, graphics, or formatted text) can be included in a conforming document.