Published today:
 
"Understanding SGML and XML Tools" by Peter Flynn
Kluwer Academic Publishers, ISBN 0-7923-8169-6
432pp, hardcover with CD-ROM (540Mb of software
including 90-day trial of WordPerfect Suite 8/SGML)
5 3/8" x 9 1/4" (135 x 235 mm), US price $84.
http://imbolc.ucc.ie/~pflynn/books/sgmltools.html
http://www.wkap.nl/book.htm/0-7923-8169-6
 
Contents
   1.Introduction to SGML: what it's for and how it can benefit you
     and your organization; understanding markup and how to use it
     to advantage; what a Document Type Definition (DTD) and an
     SGML Declaration are and why you might need one;
   2.Finding the right Document Type: how a DTD works and
     how to tell which one you're using; what's publicly available;
     descriptions of some common DTDs; how to write your own; and
     an update on the SGML standard;
   3.Editors: creating and maintaining text: how to compile a
     DTD and use a stylesheet; descriptions of popular
     general-purpose editors, editor add-ons and taggers, and some
     facilities for graphics and math;
   4.Parsing and validating; why files need to be valid; how to use
     a built-in parser, and how to use a stand-alone one; making use
     of parser output to do other things with;
   5.Manipulation and conversion; using free non-SGML tools like UNIX
     utilities, Perl, and Python; descriptions of common programmable
     SGML processing software; and some conversion tools you don't
     need to program;
   6.Finding, viewing and printing SGML; standalone viewers and
     browsers; non-visual output (Braille and audio); networked
     browsers; viewers for corpus data; getting SGML printed simply
     and quickly; SGML DTP; high-end publishing systems; and
     programmable batch systems; searching SGML text; document
     management and archiving; database systems for SGML;
   7.Rolling your own: writing SGML software: toolkits for the
     programmer; embedding SGML facilities in your own code.
Appendix on the CD-ROM, sources of further information, glossary of
terms, and indexes.
 
///Peter
--
DTDs are not common knowledge because programming students are not
taught markup.  A markup language is not a programming language.