At 19:32 +0100 1998/11/06, Marcel Oliver wrote: >Question: how difficult would it be to extend TeX to >allow for dual/multiple tier expansion? What are the draw-backs? (I leave to somebody else more qualified to respond to your particular idea.) For the general problems with TeX one must rely on more general mechanisms to solve them. >So precisely why do you think >one needs to distinguish "authoring semantics", "typesetting style" and >"fine-tuning"? It depends on how far one wants to go: On the more general side, one would work through the different movements with TeX/LaTeX, SGML, etc, isolate the semantic components, define runtime object which can be used by the Lex/Yacc parts to define a local syntactic module. A rather major undertaking. :-) Hans Aberg * Email: Hans Aberg <mailto:[log in to unmask]> * Home Page: <http://www.matematik.su.se/~haberg/> * AMS member listing: <http://www.ams.org/cml/>