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A Lisp macro is a user-defined construct that extends the Lisp
language. It is represented as an object much like a function, but with
different parameter-passing semantics. A Lisp macro has the form of a
list whose first element is the symbol macro and whose CDR
is a Lisp function object, including the lambda symbol.
Lisp macro objects are usually defined with the built-in
defmacro function, but any list that begins with macro is
a macro as far as SXEmacs is concerned. See Macros, for an explanation
of how to write a macro.