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Logtalk - Open source object-oriented logic programming language
Release 2.30.7

Copyright (c) 1998-2007 Paulo Moura.  All Rights Reserved.
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% start by loading the example:

| ?- logtalk_load(proxies(loader)).
...


% print the area and the perimeter for all circle proxies:

| ?- forall(circle(Id, R, C), (write(Id), write(' '), circle(R, C)::print)).

#1 area: 4.75291, perimeter: 7.72831, color: blue
#2 area: 43.2412, perimeter: 23.3106, color: yellow
#3 area: 0.477836, perimeter: 2.45044, color: green
#4 area: 103.508, perimeter: 36.0655, color: black
#5 area: 217.468, perimeter: 52.2761, color: cyan
yes