
DTDs for technical manuals in the format required for submission to
the DoD.
• DocBook and other DTDs designed by the AAP (Association of
American Publishers) for books, articles, and serials. This was the
first major application of SGML.
Hypertext Markup Language
Without a doubt, the most popular application of SGML is HTML.
Formally, HTML is an application of SGML. In other words, HTML is one
set of tags that follows the rules of SGML. The set of tags defined by HTML
is adapted to the structure of hypertext documents.
1. Listing 1.5 is the memo in HTML.
Listing 1.5: The Memo in HTML
<!DOCTYPE html PUBLIC “-//W3C//DTD HTML 4.0 Transitional//EN”>
<HTML> ...