A.8 Common Prolog Macros

Macros may be defined within the logic system using the form:

which is effectively the same as a Common Lisp defmacro . Logic macros are expanded before variable translation so that logic variables may be treated as atoms. defrelmacro forms must have a fixed number of arguments. This allows different predicates with the same name but different aritys to be defined. If you want to define a special form with an arbitrary number of arguments, use defrel-special-form-macro .

A.8.1 Example