Logtalk files

git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@55 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

Logtalk/examples/lo/planner/NOTES

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+=================================================================
+Logtalk - Object oriented extension to Prolog
+Release 2.8.4
+
+Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
+=================================================================
+
+To load all objects in this library consult the planner.loader utility
+file (note that the *.loader files are Prolog files).
+

Logtalk/examples/lo/planner/SCRIPT

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+=================================================================
+Logtalk - Object oriented extension to Prolog
+Release 2.8.4
+
+Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
+=================================================================
+
+
+% plan a trip from london to the aiai conference in edinburgh:
+
+| ?- plan(london)::from(imperial, aiai, L).
+
+L = [[taxi(imperial,lhr)]-[fly(lhr,edin)]-[taxi(edin,aiai)]] ? 
+
+yes

Logtalk/examples/lo/planner/aberdeen_air.lgt

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+
+:- object(aberdeen_air,
+	extends(airport)).
+
+
+	fly(renfrew).
+
+
+:- end_object.

Logtalk/examples/lo/planner/aiai.lgt

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+
+:- object(aiai,
+	extends(edinburgh)).
+
+
+:- end_object.

Logtalk/examples/lo/planner/airport.lgt

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+
+:- object(airport).
+
+
+	:- public(fly/1).
+	:- mode(fly(?), zero_or_more).
+
+	:- public(airport/1).
+	:- mode(airport(?), zero_or_more).
+
+
+	airport(Airport) :-
+		self(Airport).
+
+
+:- end_object.

Logtalk/examples/lo/planner/albert_hall.lgt

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+
+:- object(albert_hall,
+	extends(london)).
+
+
+:- end_object.

Logtalk/examples/lo/planner/castle.lgt

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+
+:- object(castle,
+	extends(edinburgh)).
+
+
+:- end_object.

Logtalk/examples/lo/planner/city.lgt

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+
+:- object(city).
+
+
+	:- public(step/3).
+	:- mode(step(+, +, -), zero_or_more).
+
+	:- public(airport/1).
+	:- mode(airport(?atom), zero_or_more).
+
+
+	step(X, Y, P1-P-P2) :-
+		\+ same_city(X, Y), !,
+		X::airport(XA),
+		Y::airport(YA),
+		plan(fly)::from(XA, YA, P),
+		plan(city)::from(X, XA, P1),
+		plan(city)::from(YA, Y, P2).
+
+	step(X, Y, taxi(X, Y)) :-
+		same_city(X, Y),
+		X \= Y.
+
+
+	same_city(X, Y) :-
+		X::airport(A),
+		Y::airport(A).
+
+
+:- end_object.

Logtalk/examples/lo/planner/edin.lgt

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+
+:- object(edin,
+	extends(edinburgh)).
+
+
+:- end_object.

Logtalk/examples/lo/planner/edinburgh.lgt

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+
+:- object(edinburgh,
+	extends(city)).
+
+
+	airport(edin).
+
+
+:- end_object.

Logtalk/examples/lo/planner/fly.lgt

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+
+:- object(fly).
+
+
+	:- public(step/3).
+	:- mode(step(+, +, -), zero_or_more).
+
+
+	step(From, To, fly(From, To)) :-
+		From::fly(To).
+
+
+:- end_object.

Logtalk/examples/lo/planner/glasgow.lgt

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+
+:- object(glasgow,
+	extends(city)).
+
+
+	airport(renfrew).
+
+
+:- end_object.

Logtalk/examples/lo/planner/imperial.lgt

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+
+:- object(imperial,
+	extends(london)).
+
+
+:- end_object.

Logtalk/examples/lo/planner/lhr.lgt

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+
+:- object(lhr,
+	extends(airport)).
+
+
+	fly(edin).
+	fly(ringway).
+
+
+:- end_object.

Logtalk/examples/lo/planner/london.lgt

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+
+:- object(london,
+	extends(city)).
+
+
+	airport(lhr).
+
+
+:- end_object.

Logtalk/examples/lo/planner/manchester.lgt

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+
+:- object(manchester,
+	extends(city)).
+
+
+	airport(ringway).
+
+
+:- end_object.

Logtalk/examples/lo/planner/plan1.lgt

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+
+:- object(plan(_)).
+
+
+	:- info([
+		authors is 'Paulo Moura',
+		version is 1.0,
+		date is 2000/4/22,
+		comment is 'Air-line trip planner.',
+		parnames is ['Mode'],
+		source is 'Example adopted from the Francis G. McCabe L&O documentation.']).
+
+
+	:- public(from/3).
+
+	:- mode(from(+atom, +atom, -list), zero_or_more).
+
+	:- info(from/3,
+		[comment is 'Plan a trip from Start to Destination.',
+		 argnames is ['Start', 'Destination', 'Plan']]).
+
+
+	from(Start, Destination, Plan) :-
+		from(Start, Destination, [], Plan).
+
+
+	from(Start, Destination, _, [Step]) :-
+		parameter(1, Mode),
+		Mode::step(Start, Destination, Step),
+		!.
+
+	from(Start, Destination, Locations, [Step| Steps]) :-
+		parameter(1, Mode),
+		Mode::step(Start, City2, Step),
+		not_member(City2, Locations),
+		from(City2, Destination, [Start| Locations], Steps).
+
+
+	not_member(_, []).
+	
+	not_member(City, [Location| Locations]) :-
+		City \= Location,
+		not_member(City, Locations).
+
+
+:- end_object.

Logtalk/examples/lo/planner/planner.loader

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+
+:- initialization(
+	logtalk_load([
+		aberdeen_air,
+		aiai,
+		airport,
+		albert_hall,
+		castle,
+		city,
+		edin,
+		edinburgh,
+		fly,
+		glasgow,
+		imperial,
+		lhr,
+		london,
+		manchester,
+		plan1,
+		renfrew,
+		ringway,
+		victoria])).

Logtalk/examples/lo/planner/renfrew.lgt

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+
+:- object(renfrew,
+	extends(airport)).
+
+
+	fly(aberdeen_air).
+	fly(ringway).
+
+
+:- end_object.

Logtalk/examples/lo/planner/ringway.lgt

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+
+:- object(ringway,
+	extends(manchester, airport)).
+
+
+	fly(lhr).
+	fly(renfrew).
+
+
+:- end_object.

Logtalk/examples/lo/planner/victoria.lgt

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+
+:- object(victoria,
+	extends(manchester)).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/NOTES

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+=================================================================
+Logtalk - Object oriented extension to Prolog
+Release 2.8.4
+
+Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
+=================================================================
+
+To load all objects in this library consult the travellers.loader utility
+file (note that the *.loader files are Prolog files).

Logtalk/examples/lo/travellers/SCRIPT

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+=================================================================
+Logtalk - Object oriented extension to Prolog
+Release 2.8.4
+
+Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
+=================================================================
+
+
+% build a route by adding one town at a time:
+
+| ?- incremental::route([london, brighton, portsmouth, exeter, oxford, aberystwyth], Route).
+
+Route = oxford~london~portsmouth~brighton~exeter~aberystwyth ?
+yes
+
+
+% presort towns by geographical distance before using the incremental algorithm:
+
+| ?- presort::route([london, brighton, portsmouth, exeter, oxford, aberystwyth], Route).
+
+Route = brighton~london~oxford~portsmouth~exeter~aberystwyth ?
+yes
+
+
+% come home after the journey:
+
+| ?- circular::route([london, brighton, portsmouth, exeter, oxford, aberystwyth], Route).
+
+Route = london~brighton~portsmouth~exeter~aberystwyth~oxford~london ?
+yes
+
+
+% blind search by generating permutations of the list of towns:
+
+| ?- permute::route([london, brighton, portsmouth, exeter, oxford, aberystwyth], Route).
+
+Route = (aberystwyth~exeter~portsmouth~brighton~london~oxford,273.6237583942784) ? 
+yes

Logtalk/examples/lo/travellers/aberdeen.lgt

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+
+:- object(aberdeen,
+	extends(location(194, 340))).
+
+
+	links([
+		(edinburgh, 115),
+		(glasgow, 142)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/aberystwyth.lgt

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+
+:- object(aberystwyth,
+	extends(location(126, 102))).
+	
+
+	links([
+		(birmingham, 114),
+		(liverpool, 100),
+		(swansea, 75)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/birmingham.lgt

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+
+:- object(birmingham,
+	extends(location(192, 106))).
+
+
+	links([
+		(aberystwyth, 114),
+		(bristol, 86),
+		(cambridge, 97),
+		(liverpool, 99),
+		(nottingham, 48),
+		(oxford, 63),
+		(sheffield, 75)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/brighton.lgt

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+
+:- object(brighton,
+	extends(location(248, 10))).
+
+
+	links([
+		(dover, 81),
+		(portsmouth, 49),
+		(london, 52)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/bristol.lgt

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+
+:- object(bristol,
+	extends(location(168, 47))).
+
+
+	links([
+		(cardiff, 44),
+		(exeter, 76),
+		(oxford, 71),
+		(birmingham, 86)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/cambridge.lgt

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+
+:- object(cambridge,
+	extends(location(254, 92))).
+
+
+    links([
+    	(nottingham, 82),
+		(oxford, 80),
+		(london, 54),
+		(birmingham, 97)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/cardiff.lgt

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+
+:- object(cardiff,
+	extends(location(148, 56))).
+
+
+    links([
+    	(bristol, 44),
+		(swansea, 45)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/carlisle.lgt

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+
+:- object(carlisle,
+	extends(location(166, 226))).
+
+
+	links([
+		(glasgow, 94),
+		(leeds, 117),
+		(newcastle, 58)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/circular.lgt

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+
+:- object(circular,
+	extends(salesman)).
+
+
+	:- info([
+		authors is 'Paulo Moura',
+		version is 1.0,
+		date is 2000/4/22,
+		comment is '.',
+		source is 'Example adopted from the Francis G. McCabe L&O documentation.']).
+
+
+	:- op(400, yfx, ~).
+
+
+	route([Town| Towns], Route) :-
+		route(Towns, Town~Town, Route).
+
+
+	route([], Route, Route).
+
+	route([Town| Towns], Route, Route2) :-
+		best_place(Route, Town, Best),
+		split(Best, Route, Town, Split),
+		route(Towns, Split, Route2).
+
+
+	best_place(Route, Town, Best) :-
+		best_place(Route, Town, 10000000, 0, 0, Best).
+
+	best_place(R~T1~T2, Town, XD, _, I, Best) :-
+		atom(T1),
+		atom(T2),
+		extra(T1, Town, T2, XT),
+		XT < XD,
+		I2 is I + 1,
+		best_place(R~T1, Town, XT, I2, I2, Best).
+
+	best_place(R~T1~T2, Town, XD, XI, I, Best) :-
+		atom(T1),
+		atom(T2),
+		I2 is I + 1,
+		best_place(R~T1, Town, XD, XI, I2, Best).
+
+	best_place(T1~T2, Town, XD, _, I, Best) :-
+		atom(T1),
+		atom(T2),
+		extra(T1, Town, T2, XT),
+		XT < XD,
+		Best is I + 1.
+
+	best_place(_~_, _, _, XI, _, XI).
+
+
+	split(0, Route, Town, Route~Town).
+
+	split(IX, Route~Town1, Town, Split~Town1) :-
+		IX2 is IX - 1,
+		split(IX2, Route, Town, Split).
+
+	split(1, Route, Town, Town~Route).
+
+
+	extra(T1, T, T2, E) :-
+		T1::crow_flies(T, E1),
+		T::crow_flies(T2, E2),
+		T1::crow_flies(T2, E3),
+		E is E1 + E2 - E3.
+
+
+:- end_object.

Logtalk/examples/lo/travellers/descend.lgt

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+
+:- object(descend).
+
+
+	:- info([
+		authors is 'Paulo Moura',
+		version is 1.0,
+		date is 2000/4/22,
+		comment is '.',
+		source is 'Example adopted from the Francis G. McCabe L&O documentation.']).
+
+
+	:- public(less/2).
+
+
+	less(X, Y):-
+		X >= Y.
+
+
+:- end_object.

Logtalk/examples/lo/travellers/dover.lgt

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+
+:- object(dover,
+	extends(location(292, 38))).
+
+
+	links([
+		(brighton, 81),
+		(london, 71)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/driving.lgt

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+
+:- object(driving,
+	extends(salesman)).
+
+
+	:- info([
+		authors is 'Paulo Moura',
+		version is 1.0,
+		date is 2000/4/22,
+		comment is '.',
+		source is 'Example adopted from the Francis G. McCabe L&O documentation.']).
+
+
+	:- op(400, yfx, ~).
+
+
+	route(Towns, Route) :-
+		presort::route(Towns, Presort), 
+		drive_around(Presort, Route).
+
+
+	drive_around(Route~Town1~Town2, Route1~Route2) :-
+		!,
+		drive_around(Route~Town1, Route1),
+		Town1::drive(Town2, Route2).
+
+	drive_around(Town1~Town2, Route) :-
+		!,
+		Town1::drive(Town2, Route).
+
+	drive_around(Town, Town).
+
+
+	drive_length(Route, Length) :-
+		drive_length(Route, 0, Length).
+
+
+	drive_length(Route~Town1~Town2, Acc, Length) :-
+		!,
+		Town1::road_distance(Town2, Length2),
+		Acc2 is Acc + Length2,
+		drive_length(Route~Town1, Acc2, Length).
+
+	drive_length(Town1~Town2, Acc, Length) :-
+		!,
+		Town1::road_distance(Town2, Length2),
+		Length is Acc + Length2.
+
+	drive_length(_, Length, Length).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/edinburgh.lgt

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+
+:- object(edinburgh,
+	extends(location(162, 282))).
+
+
+	links([
+		(aberdeen, 115),
+		(glasgow, 44),
+		(newcastle, 104)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/exeter.lgt

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+
+:- object(exeter,
+	extends(location(138, 18))).
+
+
+	links([
+		(bristol, 76),
+		(penzance, 112),
+		(portsmouth, 126)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/geographic2.lgt

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+
+:- object(geographic(_OX, _OY)).
+
+
+	:- info([
+		authors is 'Paulo Moura',
+		version is 1.0,
+		date is 2000/4/22,
+		parnames is ['OX', 'OY'],
+		comment is '.',
+		source is 'Example adopted from the Francis G. McCabe L&O documentation.']).
+
+
+	:- public(less/2).
+
+
+	less(Town1, Town2):-
+		angle(Town1, Angle1),
+		angle(Town2, Angle2),
+		Angle1 < Angle2.
+
+
+    angle(Town, Angle) :-
+		Town::at(X, Y),
+		parameter(1, OX),
+		parameter(2, OY),
+    	angle(X, Y, OX, OY, Angle).
+
+
+    angle(X, Y, OX, OY, Angle) :-
+		X > OX,
+		Y >= OY,
+		Angle is atan((Y-OY)/(X-OX)).
+
+    angle(X, Y, OX, OY, Angle) :-
+		X > OX,
+		Y < OY,
+		pi(Pi),
+		Angle is Pi + Pi - atan((OY-Y)/(X-OX)).
+
+    angle(X, Y, OX, OY, Angle) :-
+		X < OX,
+		Y >= OY,
+		pi(Pi),
+		Angle is Pi - atan((Y-OY)/(OX-X)).
+
+    angle(X, Y, OX, OY, Angle) :-
+		X < OX,
+		Y < OY,
+		pi(Pi),
+		Angle is Pi + atan((OY-Y)/(OX-X)).
+
+    angle(OX, Y, OX, OY, Angle) :- 
+		Y > OY,
+    	pi(Pi),
+    	Angle is Pi / 2.
+
+    angle(OX, Y, OX, OY, Angle) :-
+		Y =< OY,
+    	pi(Pi),
+    	Angle is 1.5 * Pi.
+
+
+	pi(Pi) :-
+		Pi is 4.0*atan(1.0).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/glasgow.lgt

@@ -0,0 +1,12 @@
+
+:- object(glasgow,
+	extends(location(132, 273))).
+
+
+	links([
+		(aberdeen, 142),
+		(carlisle, 94),
+		(edinburgh, 44)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/hull.lgt

@@ -0,0 +1,12 @@
+
+:- object(hull,
+	extends(location(240, 168))).
+
+
+	links([
+		(leeds, 58),
+		(sheffield, 65),
+		(york, 37)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/incremental.lgt

@@ -0,0 +1,91 @@
+
+:- object(incremental,
+	extends(salesman)).
+
+
+	:- info([
+		authors is 'Paulo Moura',
+		version is 1.0,
+		date is 2000/4/22,
+		comment is '.',
+		source is 'Example adopted from the Francis G. McCabe L&O documentation.']).
+
+
+	:- op(400, yfx, ~).
+
+
+	route([Town| Towns], Route) :-
+  		route(Towns, Town, Route).
+
+
+	route([], Route, Route).
+
+	route([Town| Towns], Route, Route2) :-
+		best_place(Route, Town, Best),
+		split(Best, Route, Town, NewR),
+		route(Towns, NewR, Route2).
+
+
+	best_place(Route~Town1, Town, Best) :-  % try the back first ...
+		atom(Town1),
+		Town::crow_flies(Town1, Distance),
+		best_place(Route~Town1, Town, Distance, 0, 0, Best).
+
+	best_place(Town, _, 0) :-
+		atom(Town).
+
+
+	best_place(R~T1~T2, T, XD, _, I, Best) :-
+		atom(T1),
+		atom(T2),
+		extra(T1, T, T2, XT),
+		XT < XD,
+		I2 is I + 1,
+		best_place(R~T1, T, XT, I2, I2, Best).
+
+	best_place(R~T1~T2, T, XD, XI, I, Best) :-
+		atom(T1),
+		atom(T2),
+		I2 is I + 1,
+		best_place(R~T1, T, XD, XI, I2, Best).
+
+	best_place(T1~T2, T, XD, _, I, Best) :-
+		atom(T1),
+		atom(T2),
+		extra(T1, T, T2, XT),
+		XT < XD,
+		I2 is I + 1,
+		best_place(T1, T, XT, I2, I2, Best).
+
+	best_place(T1~T2, T, XD, XI, I, Best) :-
+		atom(T1),
+		atom(T2),
+		I2 is I + 1,
+		best_place(T1, T, XD, XI, I2, Best).
+
+	best_place(T1, T, XD, _, I, Best) :-
+		atom(T1),
+		T1::crow_flies(T, Distance),
+		Distance < XD,
+		Best is I + 1.
+
+	best_place(_, _, _, XI, _, XI).
+
+
+	split(0, Route, Town, Route~Town).
+
+	split(IX, Route~Town1, Town, S~Town1) :-
+		IX2 is IX -1,
+		split(IX2, Route, Town, S).
+
+	split(1, Route, Town, Town~Route).
+
+
+	extra(T1, T, T2, XT) :-
+		T1::crow_flies(T, Distance1),
+		T::crow_flies(T2, Distance2),
+		T1::crow_flies(T2, Distance3),
+		XT is Distance1 + Distance2 - Distance3.
+
+
+:- end_object.

Logtalk/examples/lo/travellers/leeds.lgt

@@ -0,0 +1,14 @@
+
+:- object(leeds,
+	extends(location(208, 170))).
+
+
+	links([
+		(carlisle, 117),
+		(hull, 58),
+		(sheffield, 34),
+		(manchester, 41),
+		(york, 23)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/liverpool.lgt

@@ -0,0 +1,13 @@
+
+:- object(liverpool,
+	extends(location(164, 150))).
+
+
+	links([
+		(aberystwyth, 100),
+		(birmingham, 99),
+		(manchester, 35),
+		(sheffield, 70)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/location2.lgt

@@ -0,0 +1,83 @@
+
+:- object(location(_X, _Y)).
+
+
+	:- info([
+		authors is 'Paulo Moura',
+		version is 1.0,
+		date is 2000/4/22,
+		parnames is ['X', 'Y'],
+		comment is '.',
+		source is 'Example adopted from the Francis G. McCabe L&O documentation.']).
+
+
+	:- op(400, yfx, ~).
+
+
+	:- public(at/2).
+	:- mode(at(-integer, -integer), one).
+
+	:- public(crow_flies/2).
+	:- mode(crow_flies(+atom, -integer), one).
+
+	:- public(drive/2).
+	:- mode(drive(+atom, -nonvar), zero_or_more).
+
+	:- public(links/1).
+	:- mode(links(-list), one).
+
+	:- public(road_distance/2).
+	:- mode(road_distance(?atom, ?integer), zero_or_more).
+
+
+	at(X, Y) :-
+		parameter(1, X),
+		parameter(2, Y).
+
+
+	crow_flies(Town, Distance) :-
+		::at(X, Y),
+		Town::at(U, V),
+		U0 is U-X,
+		V0 is V-Y,
+		Distance is sqrt(U0*U0+V0*V0).
+
+
+	road_distance(Town, Distance) :-
+		::links(Links),
+		member((Town, Distance), Links).
+
+
+	drive(To, Route) :-  % plan a road journey
+		self(Self),
+		plan_drive(Self, To, [], _, Route).
+
+
+	% go directly
+
+	plan_drive(From, To, _, Distance, From~To):-
+		To::links(Links),
+		member((From, Distance), Links).
+
+
+	% go indirectly
+
+	plan_drive(From, To, R, D+DI, Route~To):-
+		To::links(Links),
+		nearest(Links, From, Int, DI),
+		\+ member(Int, R),
+		plan_drive(From, Int, [To| R], D, Route).
+
+
+	nearest(Links, To, Int, Distance):-
+		quick(metric(To))::sort(Links, Sorted),
+		member((Int, Distance), Sorted).
+
+
+	member(Head, [Head| _]).
+
+	member(Head, [_| Tail]) :-
+		member(Head, Tail).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/london.lgt

@@ -0,0 +1,14 @@
+
+:- object(london,
+	extends(location(244,54))).
+
+
+	links([
+		(brighton, 52),
+		(dover, 71),
+		(cambridge, 54),
+		(oxford, 57),
+		(portsmouth, 72)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/manchester.lgt

@@ -0,0 +1,12 @@
+
+:- object(manchester,
+	extends(location(180, 156))).
+
+
+    links([
+    	(leeds, 41),
+		(liverpool, 35),
+		(sheffield, 38)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/metric1.lgt

@@ -0,0 +1,24 @@
+
+:- object(metric(_Town)).
+
+
+	:- info([
+		authors is 'Paulo Moura',
+		version is 1.0,
+		date is 2000/4/22,
+		comment is '.',
+		parnames is ['Town'],
+		source is 'Example adopted from the Francis G. McCabe L&O documentation.']).
+
+
+	:- public(less/2).
+
+
+	less((Town1, _), (Town2, _)):-
+		parameter(1, Town),
+		Town::crow_flies(Town1, Distance1),
+		Town::crow_flies(Town2, Distance2),
+		Distance1 < Distance2.		
+
+
+:- end_object.

Logtalk/examples/lo/travellers/natural.lgt

@@ -0,0 +1,20 @@
+
+:- object(natural).
+
+
+	:- info([
+		authors is 'Paulo Moura',
+		version is 1.0,
+		date is 2000/4/22,
+		comment is '.',
+		source is 'Example adopted from the Francis G. McCabe L&O documentation.']).
+
+
+	:- public(less/2).
+
+
+	less(X, Y):-
+		X < Y.
+
+
+:- end_object.

Logtalk/examples/lo/travellers/newcastle.lgt

@@ -0,0 +1,12 @@
+
+:- object(newcastle,
+	extends(location(210, 230))).
+
+
+    links([
+    	(edinburgh, 104),
+		(carlisle, 58),
+		(york, 80)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/nottingham.lgt

@@ -0,0 +1,12 @@
+
+:- object(nottingham,
+	extends(location(216, 128))).
+
+
+    links([
+    	(birmingham, 48),
+		(cambridge, 82),
+		(sheffield, 38)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/oxford.lgt

@@ -0,0 +1,13 @@
+
+:- object(oxford,
+	extends(location(214, 66))).
+
+
+    links([
+    	(bristol, 71),
+		(birmingham, 63),
+		(cambridge, 80),
+		(london, 57)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/penzance.lgt

@@ -0,0 +1,10 @@
+
+:- object(penzance,
+	extends(location(10, 0))).
+
+
+    links([(
+    	exeter, 112)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/permute.lgt

@@ -0,0 +1,65 @@
+
+:- object(permute,
+	extends(salesman)).
+
+
+	:- info([
+		authors is 'Paulo Moura',
+		version is 1.0,
+		date is 2000/4/22,
+		comment is '.',
+		source is 'Example adopted from the Francis G. McCabe L&O documentation.']).
+
+
+	:- op(400, yfx, ~).
+
+
+	route(Towns, Route) :-
+		findall(
+			(Towns2, Length),
+			(permute(Towns, Towns2), route_length(Towns2, Length)),
+			List),
+		shortest(List, Route).
+
+
+	permute([Town], Town).
+
+	permute(Towns, Towns2~Town) :-
+		delete(Towns, Town, Towns3),
+		permute(Towns3, Towns2).
+
+
+	delete([Head| Tail], Head, Tail).
+
+	delete([Head| Tail], Element, [Head| Tail2]):-
+		delete(Tail, Element, Tail2).
+
+
+	route_length(Town, 0) :-
+		atom(Town), !.
+
+	route_length(Towns~Town1~Town2, Length) :-
+		!,
+		route_length(Towns~Town1, Length1),
+		Town1::crow_flies(Town2, Length2),
+		Length is Length1 + Length2.
+
+	route_length(Town1~Town2, Length) :-
+		Town1::crow_flies(Town2, Length).
+
+
+	shortest(List, Shortest) :-
+		shortest(List, null, 1000000, Shortest).
+
+
+	shortest([], Route, Length, (Route, Length)).
+
+	shortest([(Route, Length)| Routes], _, LX, Shortest) :-
+		Length < LX, !,
+		shortest(Routes, Route, Length, Shortest).
+
+	shortest([_| Routes], RX, LX, Shortest) :-
+		shortest(Routes, RX, LX, Shortest).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/portsmouth.lgt

@@ -0,0 +1,12 @@
+
+:- object(portsmouth,
+	extends(location(216, 22))).
+
+
+    links([
+    	(brighton, 49),
+		(exeter, 126),
+		(london, 72)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/presort.lgt

@@ -0,0 +1,43 @@
+
+:- object(presort,
+	extends(incremental)).
+
+
+	:- info([
+		authors is 'Paulo Moura',
+		version is 1.0,
+		date is 2000/4/22,
+		comment is '.',
+		source is 'Example adopted from the Francis G. McCabe L&O documentation.']).
+
+
+	:- uses(quick(_)).
+
+
+	route(Towns, Route) :-
+		arrange(Towns, Towns2),
+		^^route(Towns2, Route).
+
+
+	arrange(Towns, Sorted) :-
+		centre(Towns, X, Y),
+    	quick(geographic(X, Y))::sort(Towns, Sorted).
+
+
+	centre(Towns, X, Y) :-
+		average(Towns, 0, 0, U, V, 0, L),
+		X is U/L,
+		Y is V/L.
+
+
+	average([], U, V, U, V, L, L).
+
+	average([Town| Towns], UX, VX, U, V, I, L):-
+		Town::at(UT, VT),
+		UX2 is UX+UT,
+		VX2 is VX+VT,
+		I2 is I + 1,
+		average(Towns, UX2, VX2, U, V, I2, L).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/quick1.lgt

@@ -0,0 +1,45 @@
+
+:- object(quick(_Order)).
+
+
+	:- info([
+		authors is 'Paulo Moura',
+		version is 1.0,
+		date is 2000/4/22,
+		parnames is ['Order'],
+		comment is '.',
+		source is 'Example adopted from the Francis G. McCabe L&O documentation.']).
+
+
+	:- public(sort/2).
+	:- mode(sort(+list, -list), one).
+
+
+	sort([], []).
+	
+	sort([X| L], S):-
+		split(L, X, L1, L2),
+		sort(L1, S1),
+		sort(L2, S2),
+		app(S1, [X| S2], S).
+
+
+	split([], _, [], []).
+
+	split([D| L], X, [D| L1], L2):-
+		parameter(1, Order),
+		Order::less(D, X),
+		!,
+		split(L, X, L1, L2).
+
+	split([D| L], X, L1, [D| L2]):-
+		split(L, X, L1, L2).
+
+
+	app([], L, L).
+
+	app([H| T], L, [H| T2]) :-
+		app(T, L, T2).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/salesman.lgt

@@ -0,0 +1,20 @@
+
+:- object(salesman).
+
+
+	:- info([
+		authors is 'Paulo Moura',
+		version is 1.0,
+		date is 2000/4/22,
+		comment is '.',
+		source is 'Example adopted from the Francis G. McCabe L&O documentation.']).
+
+
+	:- op(400, yfx, ~).
+
+
+	:- public(route/2).
+	:- mode(route(+list, -nonvar), zero_or_more).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/sheffield.lgt

@@ -0,0 +1,15 @@
+
+:- object(sheffield,
+	extends(location(208, 142))).
+
+
+    links([
+    	(birmingham, 75),
+		(hull, 65),
+		(leeds, 34),
+		(liverpool, 70),
+		(manchester, 38),
+		(nottingham, 38)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/swansea.lgt

@@ -0,0 +1,11 @@
+
+:- object(swansea,
+	extends(location(126, 66))).
+
+
+    links([
+    	(cardiff, 45),
+		(aberystwyth, 75)]).
+
+
+:- end_object.

Logtalk/examples/lo/travellers/travellers.loader

@@ -0,0 +1,44 @@
+
+:- initialization(
+	logtalk_load([
+		aberdeen,
+		aberystwyth,
+		birmingham,
+		brighton,
+		bristol,
+		cambridge,
+		cardiff,
+		carlisle,
+		dover,
+		edinburgh,
+		exeter,
+		glasgow,
+		hull,
+		leeds,
+		liverpool,
+		london,
+		manchester,
+		newcastle,
+		nottingham,
+		oxford,
+		penzance,
+		portsmouth,
+		sheffield,
+		swansea,
+		york,
+
+		salesman,
+
+		circular,
+		driving,
+		geographic2,
+		incremental,
+		metric1,
+		permute,
+		presort,
+
+		location2,
+
+		descend,
+		quick1,
+		natural])).

Logtalk/examples/lo/travellers/york.lgt

@@ -0,0 +1,12 @@
+
+:- object(york,
+	extends(location(218, 184))).
+
+
+    links([
+    	(leeds, 23),
+		(hull, 37),
+		(newcastle, 80)]).
+
+
+:- end_object.

Logtalk/manuals/refman/builtins/abolish_category1.html

@@ -0,0 +1,70 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>abolish_category/1</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#abolish_category1">abolish_category/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+abolish_category(Category)
+</pre>
+<p>
+	Removes from the database a dynamic category.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+abolish_category(@category_identifier)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Category is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Category is not a valid category identifier:</dt>
+			<dd><code>type_error(category_identifier, Category)</code></dd>
+		<dt>Category is an identifier of a static category:</dt>
+			<dd><code>permission_error(modify, static_category, Category)</code></dd>
+		<dt>Category does not exist:</dt>
+			<dd><code>existence_error(category, Category)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- abolish_category(monitoring).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="create_protocol3.html">Previous</a> | <a href="abolish_object1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/abolish_events5.html

@@ -0,0 +1,72 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>abolish_events/5</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#abolish_events5">abolish_events/5</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+abolish_events(Event, Object, Message, Sender, Monitor)
+</pre>
+<p>
+	Abolishes all matching events.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+abolish_events(@event, @object_identifier, @callable, @object_identifier, @object_identifier)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Event is neither a variable nor a valid event identifier:</dt>
+			<dd><code>type_error(event, Event)</code></dd>
+		<dt>Object is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Object)</code></dd>
+		<dt>Message is neither a variable nor a callable term:</dt>
+			<dd><code>type_error(callable, Message)</code></dd>
+		<dt>Sender is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Sender)</code></dd>
+		<dt>Monitor is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Monitor)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- abolish_events(_, list, _, _, debugger).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="specializes_class2_3.html">Previous</a> | <a href="current_event5.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/abolish_object1.html

@@ -0,0 +1,71 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>abolish_object/1</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#abolish_object1">abolish_object/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+abolish_object(Object)
+</pre>
+</p>
+<p>
+	Removes from the database a dynamic object.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+abolish_object(@object_identifier)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Object is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Object is not a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Object)</code></dd>
+		<dt>Object is an identifier of a static object:</dt>
+			<dd><code>permission_error(modify, static_object, Object)</code></dd>
+		<dt>Object does not exist:</dt>
+			<dd><code>existence_error(object, Object)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- abolish_object(list).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="abolish_category1.html">Previous</a> | <a href="abolish_protocol1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/abolish_protocol1.html

@@ -0,0 +1,70 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>abolish_protocol/1</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#abolish_protocol1">abolish_protocol/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+abolish_protocol(Protocol)
+</pre>
+<p>
+	Removes from the database a dynamic protocol.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+abolish_protocol(@protocol_identifier)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Protocol is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Protocol is not a valid protocol identifier:</dt>
+			<dd><code>type_error(protocol_identifier, Protocol)</code></dd>
+		<dt>Protocol is an identifier of a static protocol:</dt>
+			<dd><code>permission_error(modify, static_protocol, Protocol)</code></dd>
+		<dt>Protocol does not exist:</dt>
+			<dd><code>existence_error(protocol, Protocol)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- abolish_protocol(listp).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="abolish_object1.html">Previous</a> | <a href="extends_object2_3.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/category_property2.html

@@ -0,0 +1,66 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>category_property/2</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#category_property2">category_property/2</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+category_property(Category, Property)
+</pre>
+<p>
+	Enumerates, by backtracking, the properties associated with the defined categories.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+category_property(?category_identifier, ?category_property)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Category is neither a variable nor a valid category identifier:</dt>
+			<dd><code>type_error(category_identifier, Category)</code></dd>
+		<dt>Property is neither a variable nor a valid category property:</dt>
+			<dd><code>domain_error(category_property, Property)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- category_property(Category, dynamic).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="current_protocol1.html">Previous</a> | <a href="object_property2.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/create_category4.html

@@ -0,0 +1,76 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>create_category/4</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#create_category4">create_category/4</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+create_category(Identifier, Relations, Directives, Clauses)
+</pre>
+<p>
+	Creates a new, dynamic, category.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+create_category(+category_identifier, +list, +list, +list)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Identifier is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Identifier is not a valid category identifier:</dt>
+			<dd><code>type_error(category_identifier, Identifier)</code></dd>
+		<dt>Identifier is already in use:</dt>
+			<dd><code>permission_error(replace, category, Identifier)</code></dd>
+			<dd><code>permission_error(replace, object, Identifier)</code></dd>
+			<dd><code>permission_error(replace, protocol, Identifier)</code></dd>
+		<dt>Relations is not a list:</dt>
+			<dd><code>type_error(list, Relations)</code></dd>
+		<dt>Directives is not a list:</dt>
+			<dd><code>type_error(list, Directives)</code></dd>
+		<dt>Clauses is not a list:</dt>
+			<dd><code>type_error(list, Clauses)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- create_category(foo, [implements(bar)], [], [bar(1), bar(2)]).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="protocol_property2.html">Previous</a> | <a href="create_object4.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/create_object4.html

@@ -0,0 +1,76 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>create_object/4</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#create_object4">create_object/4</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+create_object(Identifier, Relations, Directives, Clauses)
+</pre>
+<p>
+	Creates a new, dynamic, object.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+create_object(+object_identifier, +list, +list, +list)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Identifier is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Identifier is not a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Identifier)</code></dd>
+		<dt>Identifier is already in use:</dt>
+			<dd><code>permission_error(replace, category, Identifier)</code></dd>
+			<dd><code>permission_error(replace, object, Identifier)</code></dd>
+			<dd><code>permission_error(replace, protocol, Identifier)</code></dd>
+		<dt>Relations is not a list:</dt>
+			<dd><code>type_error(list, Relations)</code></dd>
+		<dt>Directives is not a list:</dt>
+			<dd><code>type_error(list, Directives)</code></dd>
+		<dt>Clauses is not a list:</dt>
+			<dd><code>type_error(list, Clauses)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- create_object(foo, [extends(bar)], [public(foo/1)], [foo(1), foo(2)]).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="create_category4.html">Previous</a> | <a href="create_protocol3.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/create_protocol3.html

@@ -0,0 +1,74 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>create_protocol/3</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#create_protocol3">create_protocol/3</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+create_protocol(Identifier, Relations, Directives)
+</pre>
+<p>
+	Creates a new, dynamic, protocol.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+create_protocol(+protocol_identifier, +list, +list)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Identifier is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Identifier is not a valid protocol identifier:</dt>
+			<dd><code>type_error(protocol_identifier, Identifier)</code></dd>
+		<dt>Identifier is already in use:</dt>
+			<dd><code>permission_error(replace, category, Identifier)</code></dd>
+			<dd><code>permission_error(replace, object, Identifier)</code></dd>
+			<dd><code>permission_error(replace, protocol, Identifier)</code></dd>
+		<dt>Relations is not a list:</dt>
+			<dd><code>type_error(list, Relations)</code></dd>
+		<dt>Directives is not a list:</dt>
+			<dd><code>type_error(list, Directives)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- create_protocol(foo, [extends(bar)], [public(foo/1)]).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="create_object4.html">Previous</a> | <a href="abolish_category1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/current_category1.html

@@ -0,0 +1,64 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>current_category/1</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#current_category1">current_category/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+current_category(Category)
+</pre>
+<p>
+	Enumerates, by backtracking, all currently defined categories. All categories are found, either static, dynamic, or built-in.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+current_category(?category_identifier)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Category is neither a variable nor a valid category identifier:</dt>
+			<dd><code>type_error(category_identifier, Category)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- current_category(monitoring).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="../directives/public1.html">Previous</a> | <a href="current_object1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/current_event5.html

@@ -0,0 +1,72 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>current_event/5</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#current_event5">current_event/5</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+current_event(Event, Object, Message, Sender, Monitor)
+</pre>
+<p>
+	Enumerates, by backtracking, all defined events.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+current_event(?event, ?object_identifier, ?callable, ?object_identifier, ?object_identifier)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Event is neither a variable nor a valid event identifier:</dt>
+			<dd><code>type_error(event, Event)</code></dd>
+		<dt>Object is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Object)</code></dd>
+		<dt>Message is neither a variable nor a callable term:</dt>
+			<dd><code>type_error(callable, Message)</code></dd>
+		<dt>Sender is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Sender)</code></dd>
+		<dt>Monitor is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Monitor)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- current_event(Event, Object, Message, Sender, debugger).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="abolish_events5.html">Previous</a> | <a href="define_events5.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/current_object1.html

@@ -0,0 +1,64 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>current_object/1</title>
+	<link rel=stylesheet type="text/css" href="../../styles.css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#current_object1">current_object/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+current_object(Object)
+</pre>
+<p>
+	Enumerates, by backtracking, all currently defined objects. All objects are found, either static, dynamic or built-in.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+current_object(?object_identifier)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Object is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Object)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- current_object(list).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="current_category1.html">Previous</a> | <a href="current_protocol1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/current_protocol1.html

@@ -0,0 +1,64 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>current_protocol/1</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#current_protocol1">current_protocol/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+current_protocol(Protocol)
+</pre>
+<p>
+	Enumerates, by backtracking, all currently defined protocols. All protocols are found, either static, dynamic, or built-in.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+current_protocol(?protocol_identifier)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Protocol is neither a variable nor a valid protocol identifier:</dt>
+			<dd><code>type_error(protocol_identifier, Protocol)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- current_protocol(listp).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="current_object1.html">Previous</a> | <a href="category_property2.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/define_events5.html

@@ -0,0 +1,74 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>define_events/2</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#define_events5">define_events/5</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+define_events(Event, Object, Message, Sender, Monitor)
+</pre>
+<p>
+	Defines a new set of events.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+define_events(@event, @object_identifier, @callable, @object_identifier, +object_identifier)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Event is neither a variable nor a valid event identifier:</dt>
+			<dd><code>type_error(event, Event)</code></dd>
+		<dt>Object is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Object)</code></dd>
+		<dt>Message is neither a variable nor a callable term:</dt>
+			<dd><code>type_error(callable, Message)</code></dd>
+		<dt>Sender is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Sender)</code></dd>
+		<dt>Monitor is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Monitor is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Monitor)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- define_events(_, list, member(_, _), _ , debugger).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="current_event5.html">Previous</a> | <a href="logtalk_compile1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/extends_object2_3.html

@@ -0,0 +1,74 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>extends_object/2-3</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#extends_object2_3">extends_object/2-3</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+extends_object(Prototype, Parent)
+
+extends_object(Prototype, Parent, Scope)
+</pre>
+<p>
+	Enumerates, by backtracking, all pairs of objects such that the first one extends the second.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+extends_object(?object_identifier, ?object_identifier)
+
+extends_object(?object_identifier, ?object_identifier, ?entity_scope)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Prototype is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Prototype)</code></dd>
+		<dt>Parent is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Parent)</code></dd>
+		<dt>Scope is neither a variable nor a valid entity scope:</dt>
+			<dd><code>type_error(entity_scope, Scope)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- extends_object(Object, state_space).
+
+| ?- extends_object(Object, list, public).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="abolish_protocol1.html">Previous</a> | <a href="extends_protocol2_3.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/extends_protocol2_3.html

@@ -0,0 +1,74 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>extends_protocol/2-3</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#extends_protocol2_3">extends_protocol/2-3</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+extends_protocol(Protocol1, Protocol2)
+
+extends_protocol(Protocol1, Protocol2, Scope)
+</pre>
+<p>
+	Enumerates, by backtracking, all pairs of protocols such that the first one extends the second.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+extends_protocol(?protocol_identifier, ?protocol_identifier)
+
+extends_protocol(?protocol_identifier, ?protocol_identifier, ?entity_scope)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Protocol1 is neither a variable nor a valid protocol identifier:</dt>
+			<dd><code>type_error(protocol_identifier, Protocol1)</code></dd>
+		<dt>Protocol2 is neither a variable nor a valid protocol identifier:</dt>
+			<dd><code>type_error(protocol_identifier, Protocol2)</code></dd>
+		<dt>Scope is neither a variable nor a valid entity scope:</dt>
+			<dd><code>type_error(entity_scope, Scope)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- extends_protocol(listp, Protocol).
+
+| ?- extends_protocol(Protocol, termp, private).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="extends_object2_3.html">Previous</a> | <a href="implements_protocol2_3.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/forall2.html

@@ -0,0 +1,66 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>forall/2</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#forall2">forall/2</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+forall(Generator, Test)
+</pre>
+<p>
+	This predicate is true if, for all solutions of Generator, Test is true (some Prolog compilers already define this or a similar predicate).
+</p>
+</blockquote>
+ 
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+forall(+callable, +callable)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Generator is not a callable term:</dt>
+			<dd><code>type_error(callable, Generator)</code></dd>
+		<dt>Test is not a callable term:</dt>
+			<dd><code>type_error(callable, Test)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- forall(member(X, [1, 2, 3]), write(X)).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="logtalk_load1.html">Previous</a> | <a href="logtalk_version3.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/implements_protocol2_3.html

@@ -0,0 +1,80 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>implements_protocol/2-3</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#implements_protocol2_3">implements_protocol/2-3</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+implements_protocol(Object, Protocol)
+implements_protocol(Category, Protocol)
+
+implements_protocol(Object, Protocol, Scope)
+implements_protocol(Category, Protocol, Scope)
+</pre>
+<p>
+	Enumerates, by backtracking, all pairs of entities such that an object or a category implements a protocol.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+implements_protocol(?object_identifier, ?protocol_identifier)
+implements_protocol(?category_identifier, ?protocol_identifier)
+
+implements_protocol(?object_identifier, ?protocol_identifier, ?entity_scope)
+implements_protocol(?category_identifier, ?protocol_identifier, ?entity_scope)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Object is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Object)</code></dd>
+		<dt>Category is neither a variable nor a valid category identifier:</dt>
+			<dd><code>type_error(category_identifier, Category)</code></dd>
+		<dt>Protocol is neither a variable nor a valid protocol identifier:</dt>
+			<dd><code>type_error(protocol_identifier, Protocol)</code></dd>
+		<dt>Scope is neither a variable nor a valid entity scope:</dt>
+			<dd><code>type_error(entity_scope, Scope)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- implements_protocol(List, listp).
+
+| ?- implements_protocol(List, listp, public).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="extends_protocol2_3.html">Previous</a> | <a href="imports_category2_3.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/imports_category2_3.html

@@ -0,0 +1,74 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>imports_category/2-3</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#imports_category2_3">imports_category/2-3</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+imports_category(Object, Category)
+
+imports_category(Object, Category, Scope)
+</pre>
+<p>
+	Enumerates, by backtracking, all pairs of objects and categories such that the first one imports the other.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+imports_category(?object_identifier, ?category_identifier)
+
+imports_category(?object_identifier, ?category_identifier, ?entity_scope)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Object is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Object)</code></dd>
+		<dt>Category is neither a variable nor a valid category identifier:</dt>
+			<dd><code>type_error(category_identifier, Category)</code></dd>
+		<dt>Scope is neither a variable nor a valid entity scope:</dt>
+			<dd><code>type_error(entity_scope, Scope)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- imports_category(debugger, monitoring).
+
+| ?- imports_category(Object, monitoring, protected).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="implements_protocol2_3.html">Previous</a> | <a href="instantiates_class2_3.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/instantiates_class2_3.html

@@ -0,0 +1,74 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>instantiates_class/2-3</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#instantiates_class2_3">instantiates_class/2-3</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+instantiates_class(Instance, Class)
+
+instantiates_class(Instance, Class, Scope)
+</pre>
+<p>
+	Enumerates, by backtracking, all pairs of objects such that the first one instantiates the second.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+instantiates_class(?object_identifier, ?object_identifier)
+
+instantiates_class(?object_identifier, ?object_identifier, ?entity_scope)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Instance is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Instance)</code></dd>
+		<dt>Class is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Class)</code></dd>
+		<dt>Scope is neither a variable nor a valid entity scope:</dt>
+			<dd><code>type_error(entity_scope, Scope)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- instantiates_class(water_jug, state_space).
+
+| ?- instantiates_class(Space, state_space, public).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="imports_category2_3.html">Previous</a> | <a href="specializes_class2_3.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/logtalk_compile1.html

@@ -0,0 +1,73 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>logtalk_compile/1</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#logtalk_compile1">logtalk_compile/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+logtalk_compile(Entities)
+</pre>
+<p>
+Compiles to disk a list of Logtalk entities (objects, protocols, or categories) using the default compiler options specified in the Logtalk configuration file. The Logtalk file name extension (by default, <code>.lgt</code>) should be omitted. Note that the argument is a list of entity/file names, not file paths.
+
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+logtalk_compile(+atom_list)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Entities is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Entities is neither a variable nor a proper list:</dt>
+			<dd><code>type_error(list, Entities)</code></dd>
+		<dt>One of the entities is not an atom:</dt>
+			<dd><code>type_error(atom, Entity)</code></dd>
+		<dt>One of the entities does not exist in the current working directory:</dt>
+			<dd><code>existence_error(entity, Entity)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- logtalk_compile([tree]).
+
+| ?- logtalk_compile([listp, list]).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="define_events5.html">Previous</a> | <a href="logtalk_compile2.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: October 1, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/logtalk_compile2.html

@@ -0,0 +1,79 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>logtalk_compile/2</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#logtalk_compile1">logtalk_compile/2</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+logtalk_compile(Entities, Options)
+</pre>
+<p>
+Compiles to disk a list of Logtalk entities (objects, protocols, or categories) using a list of options. The Logtalk file name extension (by default, <code>.lgt</code>) should be omitted. Note that the first argument is a list of entity/file names, not file paths.
+
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+logtalk_compile(+atom_list, +list)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Entities is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Entities is neither a variable nor a proper list:</dt>
+			<dd><code>type_error(list, Entities)</code></dd>
+		<dt>One of the entities is not an atom:</dt>
+			<dd><code>type_error(atom, Entity)</code></dd>
+		<dt>One of the entities does not exist in the current working directory:</dt>
+			<dd><code>existence_error(entity, Entity)</code></dd>
+		<dt>Options is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Options is neither a variable nor a list:</dt>
+			<dd><code>type_error(list, Options)</code></dd>
+		<dt>One of the options is not valid:</dt>
+			<dd><code>type_error(compiler_option, Option)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- logtalk_compile([list], []).
+
+| ?- logtalk_compile([listp, list], [xml(off), plredf(warning)]).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="logtalk_compile1.html">Previous</a> | <a href="logtalk_load1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: October 1, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/logtalk_load1.html

@@ -0,0 +1,73 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>logtalk_load/1</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#logtalk_load1">logtalk_load/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+logtalk_load(Entities)
+</pre>
+<p>
+Compiles to disk and then loads to memory a list of Logtalk entities (objects, protocols or categories) using the default compiler options specified in the Logtalk configuration file. The Logtalk file name extension (by default, <code>.lgt</code>) should be omitted. Note that the argument is a list of entity/file names, not file paths.
+
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+logtalk_load(+atom_list)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Entities is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Entities is neither a variable nor a proper list:</dt>
+			<dd><code>type_error(list, Entities)</code></dd>
+		<dt>One of the entities is not an atom:</dt>
+			<dd><code>type_error(atom, Entity)</code></dd>
+		<dt>One of the entities does not exist in the current working directory:</dt>
+			<dd><code>existence_error(entity, Entity)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- logtalk_load([tree]).
+
+| ?- logtalk_load([listp, list]).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="logtalk_compile1.html">Previous</a> | <a href="logtalk_load2.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: October 1, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/logtalk_load2.html

@@ -0,0 +1,78 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>logtalk_load/2</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#logtalk_load1">logtalk_load/2</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+logtalk_load(Entities, Options)
+</pre>
+<p>
+Compiles to disk and then loads to memory a Logtalk entity or a list of entities (objects, protocols or categories) using a list of options. The Logtalk file name extension  (by default, <code>.lgt</code>) should be omitted. Note that the first argument is a list of entity/file names, not file paths.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+logtalk_load(+atom_list, +list)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Entities is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Entities is neither a variable nor a proper list:</dt>
+			<dd><code>type_error(list, Entities)</code></dd>
+		<dt>One of the entities is not an atom:</dt>
+			<dd><code>type_error(atom, Entity)</code></dd>
+		<dt>One of the entities does not exist in the current working directory:</dt>
+			<dd><code>existence_error(entity, Entity)</code></dd>
+		<dt>Options is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Options is neither a variable nor a list:</dt>
+			<dd><code>type_error(list, Options)</code></dd>
+		<dt>One of the options is not valid:</dt>
+			<dd><code>type_error(compiler_option, Option)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- logtalk_load([list], []).
+
+| ?- logtalk_load([listp, list], [xml(off), plredf(warning)]).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="logtalk_load1.html">Previous</a> | <a href="forall2.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: October 1, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/logtalk_version3.html

@@ -0,0 +1,68 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>logtalk_version/3</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#logtalk_version3">logtalk_version/3</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+logtalk_version(Major, Minor, Patch)
+</pre>
+<p>
+	Returns the Logtalk pre-processor and runtime version.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+logtalk_version(?integer, ?integer, ?integer)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Major is neither a variable nor an integer:</dt>
+			<dd><code>type_error(integer, Major)</code></dd>
+		<dt>Minor is neither a variable nor an integer:</dt>
+			<dd><code>type_error(integer, Minor)</code></dd>
+		<dt>Patch is neither a variable nor an integer:</dt>
+			<dd><code>type_error(integer, Patch)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- logtalk_version(Major, Minor, Patch).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="forall2.html">Previous</a> | <a href="retractall1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/object_property2.html

@@ -0,0 +1,66 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>object_property/2</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#object_property2">object_property/2</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+object_property(Object, Property)
+</pre>
+<p>
+	Enumerates, by backtracking, the properties associated with the defined objects.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+object_property(?object_identifier, ?object_property)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Object is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Object)</code></dd>
+		<dt>Property is neither a variable nor a valid object property:</dt>
+			<dd><code>domain_error(object_property, Property)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- object_property(list, Property).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="category_property2.html">Previous</a> | <a href="protocol_property2.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/protocol_property2.html

@@ -0,0 +1,66 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>protocol_property/2</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#protocol_property2">protocol_property/2</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+protocol_property(Protocol, Property)
+</pre>
+<p>
+	Enumerates, by backtracking, the properties associated with the currently defined protocols.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+protocol_property(?protocol_identifier, ?protocol_property)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Protocol is neither a variable nor a valid protocol identifier:</dt>
+			<dd><code>type_error(protocol_identifier, Protocol)</code></dd>
+		<dt>Property is neither a variable nor a valid protocol property:</dt>
+			<dd><code>domain_error(protocol_property, Property)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- protocol_property(listp, Property).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="object_property2.html">Previous</a> | <a href="create_category4.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/retractall1.html

@@ -0,0 +1,64 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>retractall/1</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#retractall1">retractall/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+retractall(Head)
+</pre>
+<p>
+	Logtalk adds this built-in predicate, with the usual definition, to a Prolog compiler if it is not already defined.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+retractall(+callable)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Head is not a callable term:</dt>
+			<dd><code>type_error(callable, Head)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- retractall(foo(_)).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="logtalk_version3.html">Previous</a> | <a href="../methods/parameter2.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/builtins/specializes_class2_3.html

@@ -0,0 +1,74 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>specializes_class/2-3</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#specializes_class2_3">specializes_class/2-3</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+specializes_class(Class, Superclass)
+
+specializes_class(Class, Superclass, Scope)
+</pre>
+<p>
+	Enumerates, by backtracking, all pairs of objects such that the first one specializes the second.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+specializes_class(?object_identifier, ?object_identifier)
+
+specializes_class(?object_identifier, ?object_identifier, ?entity_scope)
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Class is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Class)</code></dd>
+		<dt>Superclass is neither a variable nor a valid object identifier:</dt>
+			<dd><code>type_error(object_identifier, Superclass)</code></dd>
+		<dt>Scope is neither a variable nor a valid entity scope:</dt>
+			<dd><code>type_error(entity_scope, Scope)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- specializes_class(Subclass, state_space).
+
+| ?- specializes_class(Subclass, state_space, public).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="instantiates_class2_3.html">Previous</a> | <a href="abolish_events5.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/control/external1.html

@@ -0,0 +1,64 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>{}/1</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#external1">{}/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+{Goal}
+</pre>
+<p>
+	Calls external Prolog code. Can be used to bypass the Logtalk pre-processor/compiler.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+{+callable}
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+<p>
+	(none)
+</p>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+N1/D1 &lt; N2/D2 :-
+    {N1*D2 &lt; N2*D1}.
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="to_super1.html">Previous</a> | <a href="../errors.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: October 8, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/control/to_object2.html

@@ -0,0 +1,81 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+	<head>
+		<title>::/2</title>
+		<link rel=stylesheet  href="../../styles.css" type="text/css">
+	</head>
+
+<body>
+
+<hr />
+
+<h2><code><a class="back" title="Return to index" href="../index.html#to_object2">::/2</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+Object::Predicate
+
+(Object1, Object2, ...)::Predicate
+
+(Object1; Object2, ...)::Predicate
+
+Object::(Predicate1, Predicate2, ...)
+
+Object::(Predicate1; Predicate2; ...)
+</pre>
+<p>
+Sends a message to an object. The message argument must match a public predicate of the receiver object. We can also send the same message to a set of objects or a set of messages to the same object. The "<CODE>,</CODE>" and "<CODE>;</CODE>" in the list have the usual Prolog meaning.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
++receivers::+messages
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+<dl>
+	<dt>Either Object or Predicate is a variable:</dt>
+		<dd><code>instantiation_error</code></dd>
+	<dt>Predicate is declared private:</dt>
+		<dd><code>permission_error(access, private_predicate, Predicate)</code></dd>
+	<dt>Predicate is declared protected:</dt>
+		<dd><code>permission_error(access, protected_predicate, Predicate)</code></dd>
+	<dt>Predicate is not declared:</dt>
+		<dd><code>existence_error(predicate_declaration, Predicate)</code></dd>
+	<dt>Object does not exist:</dt>
+		<dd><code>existence_error(object, Object)</code></dd>
+</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+| ?- list::member(X, [1, 2, 3]).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="../methods/after3.html">Previous</a> | <a href="to_self1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: October 7, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/control/to_self1.html

@@ -0,0 +1,75 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+	<head>
+		<title>::/1</title>
+		<link rel=stylesheet  href="../../styles.css" type="text/css">
+	</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#to_self1">::/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+::Predicate
+
+::(Predicate1, Predicate2, ...)
+
+::(Predicate1; Predicate2; ...)
+</pre>
+<p>
+	Send a message to <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a>. Only used in the body of a predicate definition. The argument should match a public or protected predicate of <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a>. It may also match a private predicate if the predicate is imported from a category, if used from inside a category, or when using private inheritance. We can also send a set of messages to self. The "<CODE>,</CODE>" and "<CODE>;</CODE>" in the list have the usual Prolog meaning.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+::+messages
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Predicate is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Predicate is declared private:</dt>
+			<dd><code>permission_error(access, private_predicate, Predicate)</code></dd>
+		<dt>Predicate is not declared:</dt>
+			<dd><code>existence_error(predicate_declaration, Predicate)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+area(Area) :-
+    ::width(Width),
+    ::height(Height),
+    Area is Width*Height.
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="to_object2.html">Previous</a> | <a href="to_super1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: October 8, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/control/to_super1.html

@@ -0,0 +1,72 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>^^/1</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#to_super1">^^/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+^^Predicate
+</pre>
+<p>
+	Calls a redefined/inherited definition for a message. Normally only used in the body of a predicate definition for the message. Predicate should match a public or protected predicate of <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a> or be within the scope of <a class="glossary" title="Go to glossary definition" href="../../glossary.html#this">this</a>.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+^^+message
+</pre>
+</blockquote>
+
+<h3>Errors</h3>
+
+<blockquote>
+	<dl>
+		<dt>Predicate is a variable:</dt>
+			<dd><code>instantiation_error</code></dd>
+		<dt>Predicate is declared private:</dt>
+			<dd><code>permission_error(access, private_predicate, Predicate)</code></dd>
+		<dt>Predicate is not declared:</dt>
+			<dd><code>existence_error(predicate_declaration, Predicate)</code></dd>
+		<dt>Container of the inherited predicate definition is the same object that contains the <code>^^/1</code> call:</dt>
+			<dd><code>endless_loop(Predicate)</code></dd>
+	</dl>
+</blockquote>
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+init :-
+        assertz(counter(0)),
+        ^^init.
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="to_self1.html">Previous</a> | <a href="external1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/directives/calls1.html

@@ -0,0 +1,58 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>calls/1</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#calls1">calls/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+calls(Protocol)
+calls(Protocol1, Protocol2, ...)
+calls([Protocol1, Protocol2, ...])
+</pre>
+<p>
+	Declares the protocol(s) that are called by predicates defined in an object or category.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+calls(+protocol_identifiers)
+</pre>
+</blockquote>
+
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+:- calls(comparingp).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="../index.html">Previous</a> | <a href="category1_2.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/directives/category1_2.html

@@ -0,0 +1,68 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>category/1-2</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#category1_2">category/1-2</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+category(Category)
+
+category(Category,
+    implements(Protocols))
+</pre>
+<p>
+	Starting category directive.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+category(+category_identifier)
+
+category(+category_identifier,
+    implements(+implemented_protocols))
+</pre>
+</blockquote>
+
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+:- category(monitoring).
+
+:- category(monitoring,
+    implements(monitoringp)).
+
+:- category(attributes,
+    implements(protected::variables)).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="calls1.html">Previous</a> | <a href="dynamic0.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/directives/discontiguous1.html

@@ -0,0 +1,62 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>discontiguous/1</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#discontiguous1">discontiguous/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+discontiguous(Predicate)
+discontiguous(Predicate1, Predicate2, ...)
+discontiguous([Predicate1, Predicate2, ...])
+</pre>
+<p>
+	Declares discontiguous predicates.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+discontiguous(+predicate_indicator_term)
+</pre>
+</blockquote>
+
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+:- discontiguous(counter/1).
+
+:- discontiguous(lives/2, works/2).
+
+:- discontiguous([db/4, key/2, file/3]).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="uses1.html">Previous</a> | <a href="dynamic1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/directives/dynamic0.html

@@ -0,0 +1,56 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>dynamic/0</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#dynamic0">dynamic/0</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+dynamic
+</pre>
+<p>
+Declares an entity and all of its directives and clauses dynamic.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+dynamic
+</pre>
+</blockquote>
+
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+:- dynamic.
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="category1_2.html">Previous</a> | <a href="end_category0.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/directives/dynamic1.html

@@ -0,0 +1,62 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>dynamic/1</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#dynamic1">dynamic/1</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+dynamic(Predicate)
+dynamic(Predicate1, Predicate2, ...)
+dynamic([Predicate1, Predicate2, ...])
+</pre>
+<p>
+	Declares dynamic predicates. Note that an object can be static and have both static and dynamic predicates.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+dynamic(+predicate_indicator_term)
+</pre>
+</blockquote>
+
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+:- dynamic(counter/1).
+
+:- dynamic(lives/2, works/2).
+
+:- dynamic([db/4, key/2, file/3]).
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="discontiguous1.html">Previous</a> | <a href="info2.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/directives/end_category0.html

@@ -0,0 +1,56 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>end_category/0</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#end_category0">end_category/0</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+end_category
+</pre>
+<p>
+	Ending category directive.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+end_category
+</pre>
+</blockquote>
+
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+:- end_category.
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="dynamic0.html">Previous</a> | <a href="end_object0.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>

Logtalk/manuals/refman/directives/end_object0.html

@@ -0,0 +1,56 @@
+<!doctype html public "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+
+<html>
+
+<head>
+	<title>end_object/0</title>
+	<link rel=stylesheet  href="../../styles.css" type="text/css">
+</head>
+
+<body>
+
+<hr />
+<h2><code><a class="back" title="Return to index" href="../index.html#end_object0">end_object/0</a></code></h2>
+<hr />
+
+<h4>Description</h4>
+
+<blockquote>
+<pre>
+end_object
+</pre>
+<p>
+	Ending object directive.
+</p>
+</blockquote>
+
+<h4>Template and modes</h4>
+
+<blockquote>
+<pre>
+end_object
+</pre>
+</blockquote>
+
+
+<h4>Examples</h4>
+
+<blockquote>
+<pre>
+:- end_object.
+</pre>
+</blockquote>
+
+<hr />
+<p class="center">
+<strong><a href="end_category0.html">Previous</a> | <a href="end_protocol0.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
+</p>
+<p class="center">
+Last updated on: July 4, 2000
+</p>
+<hr />
+
+</body>
+
+</html>