A dialect of LaTeX with a fixed command vocabulary where all macro
expansions must be effective in that vocabulary.
A language essentially equivalent to an SGML document type.
More about this at TUG 2010 in San Francisco this June
15. Acknowledgement
The XHTML + MathML version of these slides uses W3C's
Slidy by
Dave Raggett, a JavaScript/CSS package for sizing and flow control of
an HTML or XHTML slide show.
(The slides were generated in a non-standard fashion from GELLMU source.)