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 Re: Shortref mechanism Frank Mittelbach <[log in to unmask]> Sun, 2 Mar 1997 19:01:25 +0100 text/plain (28 lines) Werner Lemberg writes:  > On Sun, 2 Mar 1997, Hans Aberg wrote:  >  > > Actually, what is needed, is a simple extension of the TeX \def command:  > > \def\name{definition text}[exception text]  > > If a command somehow is unable to process the parameter text, then the  > > original input text (before the parsing of the parameter text began) is  > > left unaffected, and the execution passes to the exception text.  > > Then stuff like optional commands could be implemented most easily, and  > > perhaps the stuff you are asking for, too.  >  > This sounds for me like an OTP (Omega Translation Process) input filter.  > With Omega you can do a lot of manipulation (notably character encoding  > conversion and various more or less complicated character cluster->glyph  > transformations e.g. for Hebrew or Arabic) of text before TeX sees the  > text. You can avoid any active characters. i think you are mistaken. The comments by Hans are targeted towards general features or misfeatures (or missing features :-) of TeX's parsing machinery. OTPs in omega are filters which means they offer a preprocessing step but not a generally enhanced parsing functionality of the macro language itself. however as i said before this is not the right list to dicuss extensions to TeX itself frank