Introductory material on hygienic macros in dr scheme

["Chris Wright" <caw@cs.mu.oz.au>]

What would be the best place to find introductory material on the macro
syntax in dr scheme.

I guess I'm looking for something a little more gentle than what's in the
help desk, that might show show some "old-style"  common lisp macros would
look if converted to the r5 style:

eg:


(defmacro while (test &rest body)
    `(do ()
        ((not ,test))
       ,@body))

Thanks

Chris


Dr. Chris Wright
Director, ICU
Monash Medical Centre
Clayton VIC 3168 AUSTRALIA