[racket] Formal Presentation and initial doubts.

Welcome to Racket, Alejandro.

The different Racket macro tools are harder to learn than CL's.  But 
once you invest in learning the Racket ones, in my experience, they feel 
much more sophisticated than CL's.  Macros are easily one of Racket's 
biggest strengths over other languages.

There are a few different ways to define macros in Racket.  The most 
sophisticated is "syntax-parse", but the documentation is imposing. If 
you want to start with something sophisticated, but "syntax-parse" is 
just a little too much, try a "syntax-case" tutorial first.

I recommend ignoring "define-syntax-rule" and "syntax-rules".  Those 
forms are fine for many simple things, but you probably will soon want 
to do things that those forms make hard to do.  So why not just start 
with "syntax-parse" or "syntax-rules", and then you can learn their 
features smoothly and incrementally?

One tip for writing macros: make your transformer pattern variables be 
all-uppercase.  This convention makes reading and writing macros much 
easier for humans, and also less confusing to learn (because people 
seeing examples are less confused over what is a pattern variable and 
what is a normal Racket variable).

Neil V.