Is there some practical way to define new tags and have them substituted to code by a preprocessor? What I'm looking for is something pretty similar to what in C would be: #define <math> <?plugin TeX2png text="$$ #define </math> $$" ?> So when someone writes: <math>x^2</math> it's preprocessed and translated to: <?plugin TeX2png text="$$y^2+x$$" ?> before being processed by the wiki. I think it would clean the syntax and ease some repetitive tasks. It seems that there's no support at all for it, and I'm willing to implement it, but I need a bit of help to find myself around the code. I suppose this code would go into BlockParser.php, perhaps at _getBlock? Any ideas or suggestions are appreciated. -- Bruno Barberi Gnecco <brunobg_at_users.sourceforge.net> http://www.lsi.usp.br/~brunobg/ Never worry about theory as long as the machinery does what it's supposed to do. -- R.A. Heinlein