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Logtalk - Object oriented extension to Prolog
Release 2.27.1

Copyright (c) 1998-2006 Paulo Moura.  All Rights Reserved.
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% start by loading the example:

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


% some queries using the time and date parametric objects:

| ?- date(Year, Month, Day)::today.

Year = 2000
Month = 8
Day = 15 

Yes


| ?- date(Year, _, _)::(today, \+ leap_year). 

Year = 2002

yes


| ?- time(Hours, Mins, Secs)::now.

Hours = 13
Mins = 52
Secs = 42 

Yes


| ?- R = rectangle(W, H, X, Y), R::init, R::move(3, 4, NR), NR::position(X2, Y2).

R = rectangle(2, 1, 0, 0)
W = 2
H = 1
X = 0
Y = 0
NR = rectangle(2, 1, 3, 4)
X2 = 3
Y2 = 4 

Yes