A paper by ClausBraband and MichaelSchwartzbach of the University of Aarhus (Denmark) on the macro preprocessor used in <BigWig>.  Compares and contrasts it with many other macro preprocessors, including those of CeePlusPlus, SchemeLanguage (DefineSyntax), DylanLanguage, and a few others.  Interesting read.

Available online at http://www.brics.dk/bigwig/publications/macro.pdf

Supposedly, a similar system is in NeedleLanguage.
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CategoryPaper