Gerard Peregrin wrote [in HTML, grrrr!!!]
> The author of the following statement makes reference to other ways to
> indicate the presence of an SGML element in a text. Does anyone have a
> to information that describes such other ways?
The author of the statement may not want to go so far back into the remote
past, at least not at the end of a very hot and probably busy week, but if
you really want to know, try starting with