:- protocol(numberlistp).
:- info([
version is 1.0,
author is 'Paulo Moura',
date is 2000/7/24,
comment is 'List of numbers protocol.']).
:- public(sum/2).
:- mode(sum(+list, ?number), zero_or_one).
:- info(sum/2,
[comment is 'Calculates the sum of all list values.',
argnames is ['List', 'Sum']]).
:- public(average/2).
:- mode(average(+list, ?number), zero_or_one).
:- info(average/2,
[comment is 'Calculates the average of a list of values.',
argnames is ['List', 'Average']]).
:- end_protocol.
