SGML (, T E Xa nd )

What SGML (and T E X) is all about is given in a nutshell. Markup of example document elements, by SGML and L AT E X, are provided. Coupling SGML to T E X is considered by direct translation and by the intermediate procedural markup phase. Interfacing SGML to (La)T E X is also addressed. Some guidelines are provided in order to decide when SGML, or T E X (alone, both, or neither) might be beneficial. It is a 3-in-1 paper: what is SGML and T E X all about, examples of marked up copy in SGML and (La)T E X and the coupling issues, finished up with a literature compilation. What is a Document?