Updated to Logtalk 2.9.1

git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@211 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2001-12-05 23:57:48 +00:00 · 2001-12-05 23:57:48 +00:00 · b77427df89
commit b77427df89
parent 9c7149eab5
171 changed files with 1692 additions and 711 deletions
--- a/Logtalk/README.YAP
+++ b/Logtalk/README.YAP
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -16,6 +16,6 @@ Logtalk documentation or by using the call:
 | ?- use_module(library(logtalk)).
-Note that, although we load Logtalk using the @code{use_module/1} 
+Note that, although we load Logtalk using the use_module/1 built-in 
-built-in predicate, the system is not packaged as a module not does 
+predicate, the system is not packaged as a module nor does it use 
-it use modules in its implementation.
+modules in its implementation.
--- a/Logtalk/examples/NOTES
+++ b/Logtalk/examples/NOTES
@ -1,12 +1,12 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
 This folder contains several examples of Logtalk programs. Most of 
-these examples need objects, protocols and categories that are
+these examples need objects, protocols, and categories that are
 defined in the Logtalk standard library or in other examples, so 
 you should load them first (see the NOTES file inside each example 
 folder).
@ -36,6 +36,9 @@ bricks
 classvars
 	example of implementation of class variables (as found in Smalltalk)
 errors
 	example showing the Logtalk compiler warning and error reporting
 inheritance
 	examples of public, protected and private inheritance with both 
 	prototypes and classes/instances
@ -84,7 +87,7 @@ roots
 	objects, protocols and categories needed by most of the other examples
 searching
-	state-space searching frame work
+	state-space searching framework
 	example adopted from Ivan Bratko's "Prolog Programming for Artificial 
 	Intelligence" book
@ -93,7 +96,7 @@ sicstus
 symdiff
 	example of using parametric objects to implement symbolic expression 
-	differentiation and simplification.
+	differentiation and simplification
 viewpoints
 	example on how to implement property and value sharing with prototypes
--- a/Logtalk/examples/birds/NOTES
+++ b/Logtalk/examples/birds/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/birds/SCRIPT
+++ b/Logtalk/examples/birds/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/birds/birds.loader
+++ b/Logtalk/examples/birds/birds.loader
@ -2,10 +2,11 @@
 :- initialization(
 	logtalk_load([
 		descriptors,
 		expert,
 		order,
 		expert,
 		falconiforms,				% orders
 		passerformes,
 		tubenose,
--- a/Logtalk/examples/bricks/NOTES
+++ b/Logtalk/examples/bricks/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/bricks/SCRIPT
+++ b/Logtalk/examples/bricks/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/classvars/NOTES
+++ b/Logtalk/examples/classvars/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/classvars/SCRIPT
+++ b/Logtalk/examples/classvars/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/inheritance/NOTES
+++ b/Logtalk/examples/inheritance/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -12,5 +12,5 @@ This folder contains examples of public, protected and private inheritance,
 for both prototypes and classes/instances. The category "predicates" defines 
 a set of three predicates, one public, one protected and one private. This
 category is imported by the root objects: "parent" for the prototypes and 
-"object" for the classes/instances. Each root object have a set of three 
+"root" for the classes/instances. Each root object have a set of three 
 descendants, each one using one of the inheritance types.
--- a/Logtalk/examples/inheritance/SCRIPT
+++ b/Logtalk/examples/inheritance/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -52,6 +52,36 @@ protected/0 - private
 yes
 % descendant1 extends public::prototype1
 | ?- descendant1::interface.
 interface/0 - public
 public/0 - public
 protected/0 - protected
 yes
 % descendant2 extends public::prototype2
 | ?- descendant2::interface.
 interface/0 - public
 public/0 - protected
 protected/0 - protected
 yes
 % descendant3 extends public::prototype3
 | ?- descendant3::interface.
 interface/0 - public
 yes
 % object (root of the inheritance graph) interface
--- a/Logtalk/examples/inheritance/inheritance.loader
+++ b/Logtalk/examples/inheritance/inheritance.loader
@ -8,6 +8,9 @@
 		prototype1,
 		prototype2,
 		prototype3,
 		descendant1,
 		descendant2,
 		descendant3,
 		root,
 		subclass1,
--- a/Logtalk/examples/instmethods/NOTES
+++ b/Logtalk/examples/instmethods/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/instmethods/SCRIPT
+++ b/Logtalk/examples/instmethods/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/lo/NOTES
+++ b/Logtalk/examples/lo/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/lo/planner/NOTES
+++ b/Logtalk/examples/lo/planner/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/lo/planner/SCRIPT
+++ b/Logtalk/examples/lo/planner/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/lo/planner/planner.loader
+++ b/Logtalk/examples/lo/planner/planner.loader
@ -1,21 +1,21 @@
 :- initialization(
 	logtalk_load([
-		aberdeen_air,
+		plan1,
 		aiai,
 		airport,
-		albert_hall,
+		aberdeen_air,
 		castle,
 		city,
-		edin,
+		london,
 		albert_hall,
 		edinburgh,
 		edin,
 		aiai,
 		castle,
 		fly,
 		glasgow,
 		imperial,
 		lhr,
 		london,
 		manchester,
 		plan1,
 		renfrew,
 		ringway,
 		victoria])).
--- a/Logtalk/examples/lo/travellers/NOTES
+++ b/Logtalk/examples/lo/travellers/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/lo/travellers/SCRIPT
+++ b/Logtalk/examples/lo/travellers/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/lo/travellers/travellers.loader
+++ b/Logtalk/examples/lo/travellers/travellers.loader
@ -1,6 +1,10 @@
 :- initialization(
 	logtalk_load([
 		quick1,
 		location2,
 		aberdeen,
 		aberystwyth,
 		birmingham,
@ -30,15 +34,12 @@
 		salesman,
 		circular,
 		incremental,
 		presort,
 		driving,
 		geographic2,
 		incremental,
 		metric1,
 		permute,
 		presort,
 		location2,
 		descend,
 		quick1,
 		natural])).
--- a/Logtalk/examples/lpa/NOTES
+++ b/Logtalk/examples/lpa/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/lpa/SCRIPT
+++ b/Logtalk/examples/lpa/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/lpa/lpa.loader
+++ b/Logtalk/examples/lpa/lpa.loader
@ -1,15 +1,15 @@
 :- initialization(
 	logtalk_load([
 		cylinders,
 		distributor,
 		electrical,
 		engine,
 		fault,
 		mechanical,
 		engine,
 		cylinders,
 		electrical,
 		starting,
 		sparking,
 		plugs,
 		distributor,
 		fuel_system,
 		lights,
-		mechanical,
+		starter_motor])).
 		plugs,
 		sparking,
 		starter_motor,
 		starting])).
--- a/Logtalk/examples/metapredicates/NOTES
+++ b/Logtalk/examples/metapredicates/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/metapredicates/SCRIPT
+++ b/Logtalk/examples/metapredicates/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/metapredicates/metapredicates.loader
+++ b/Logtalk/examples/metapredicates/metapredicates.loader
@ -1,5 +1,5 @@
 :- initialization(
 	logtalk_load([
-		sort1, 
+		tracer,
-		tracer])). 
+		sort1])). 
--- a/Logtalk/examples/mi/NOTES
+++ b/Logtalk/examples/mi/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/mi/SCRIPT
+++ b/Logtalk/examples/mi/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/mi/mi.loader
+++ b/Logtalk/examples/mi/mi.loader
@ -2,9 +2,9 @@
 :- initialization(
 	logtalk_load([
 		space,
 		space_time,
 		time,
 		space_time,
 		space3,
-		space_time4,
+		time1,
-		time1])).
+		space_time4])).
--- a/Logtalk/examples/miscellaneous/NOTES
+++ b/Logtalk/examples/miscellaneous/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/miscellaneous/SCRIPT
+++ b/Logtalk/examples/miscellaneous/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/parametric/NOTES
+++ b/Logtalk/examples/parametric/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/parametric/SCRIPT
+++ b/Logtalk/examples/parametric/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/poem/poem.loader
+++ b/Logtalk/examples/poem/poem.loader
@ -1,7 +1,7 @@
 :- initialization(
 	logtalk_load([
 		circle2,
 		ellipse3,
 		circle2,
 		line2,
 		point2])).
--- a/Logtalk/examples/points/NOTES
+++ b/Logtalk/examples/points/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/points/SCRIPT
+++ b/Logtalk/examples/points/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/points/points.loader
+++ b/Logtalk/examples/points/points.loader
@ -1,9 +1,9 @@
 :- initialization(
 	logtalk_load([
 		bounded_coordinate,
 		bounded_history_point,
 		bounded_point,
 		history_point,
 		point,
-		point_history])).
+		point_history,
 		bounded_coordinate,
 		bounded_point,
 		bounded_history_point,
 		history_point])).
--- a/Logtalk/examples/polygons/NOTES
+++ b/Logtalk/examples/polygons/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/polygons/SCRIPT
+++ b/Logtalk/examples/polygons/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/polygons/polygons.loader
+++ b/Logtalk/examples/polygons/polygons.loader
@ -2,8 +2,8 @@
 :- initialization(
 	logtalk_load([
 		concentric,
 		polygon,
 		hexagon,
 		pentagon,
 		polygon,
 		square,
 		triangle])). 
--- a/Logtalk/examples/profiling/NOTES
+++ b/Logtalk/examples/profiling/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/profiling/SCRIPT
+++ b/Logtalk/examples/profiling/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/reflection/NOTES
+++ b/Logtalk/examples/reflection/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/reflection/SCRIPT
+++ b/Logtalk/examples/reflection/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/relations/NOTES
+++ b/Logtalk/examples/relations/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/relations/SCRIPT
+++ b/Logtalk/examples/relations/SCRIPT
@ -1,12 +1,9 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
-% :
+% the objects in this example are used by several of the other examples.
 | ?- 
--- a/Logtalk/examples/roots/NOTES
+++ b/Logtalk/examples/roots/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/roots/SCRIPT
+++ b/Logtalk/examples/roots/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/roots/roots.loader
+++ b/Logtalk/examples/roots/roots.loader
@ -2,7 +2,7 @@
 :- initialization(
 	logtalk_load([
 		initialization,
 		classp, class,
 		objectp, object,
 		abstract_classp, abstract_class,
 		classp, class,
 		nil])).
--- a/Logtalk/examples/searching/NOTES
+++ b/Logtalk/examples/searching/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -12,9 +12,10 @@ You will need to also load the objects in the roots example.
 You will also need to load the following files in the library directory: 
 dates.loader, types.loader, events.loader, metapredicates.loader, and 
-hierarchies.loader.
+hierarchies.loader. Alternatively, you can just load the all.loader file.
 Some of the code in this folder is adopted from the book "Prolog Programming
 for Artificial Intelligence" by Ivan Bratko.
-The object "performance" only provides correct results for the first solution.
+For a description of the search problems, please see a classical AI book 
 (such as the one above) or visit the url <http://www.plastelina.net/games>.
--- a/Logtalk/examples/searching/SCRIPT
+++ b/Logtalk/examples/searching/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -43,8 +43,8 @@ CC.<__>..........MMMC
 ..........<__>.MMMCCC
 Cost = 15,
-Path = [((3,3),esq,0,0),((2,2),dir,1,1),((3,2),esq,0,1),((3,0),dir,0,3),((3,1),esq,0,2),((1,1),dir,2,2),((2,2),esq,1,1),((0,2),dir,3,1),((0,3),esq,3,0),((0,1),dir,3,2),((0,2),esq,3,1),((0,0),dir,3,3)],
+Path = [((3,3),left,0,0),((2,2),right,1,1),((3,2),left,0,1),((3,0),right,0,3),((3,1),left,0,2),((1,1),right,2,2),((2,2),left,1,1),((0,2),right,3,1),((0,3),left,3,0),((0,1),right,3,2),((0,2),left,3,1),((0,0),right,3,3)],
-Initial = ((3,3),esq,0,0)
+Initial = ((3,3),left,0,0)
 yes
@ -65,16 +65,43 @@ C..........<__>.MMMCC
 CC.<__>..........MMMC
 ..........<__>.MMMCCC
 solution length: 12
-number of state transitions: 27
+number of state transitions: 26
-ratio solution length / state transitions: 0.4444444444444444
+ratio solution length / state transitions: 0.461538
-minimum branching degree: 2
+minimum branching degree: 1
-average branching degree: 2.5555555555555554
+average branching degree: 2.30769
 maximum branching degree: 3
-time: 0.067999999999756255
+time: 0.02
 Cost = 15,
-Path = [((3,3),esq,0,0),((2,2),dir,1,1),((3,2),esq,0,1),((3,0),dir,0,3),((3,1),esq,0,2),((1,1),dir,2,2),((2,2),esq,1,1),((0,2),dir,3,1),((0,3),esq,3,0),((0,1),dir,3,2),((0,2),esq,3,1),((0,0),dir,3,3)],
+Path = [((3,3),left,0,0),((2,2),right,1,1),((3,2),left,0,1),((3,0),right,0,3),((3,1),left,0,2),((1,1),right,2,2),((2,2),left,1,1),((0,2),right,3,1),((0,3),left,3,0),((0,1),right,3,2),((0,2),left,3,1),((0,0),right,3,3)],
-Initial = ((3,3),esq,0,0) ? 
+Initial = ((3,3),left,0,0) ? 
 yes
 % bridge problem, solved using a hill climbing strategy
 | ?- performance::init, bridge::initial_state(Initial), hill_climbing(30)::solve(bridge, Initial, Path, Cost), bridge::print_path(Path), performance::report.
 _|____________|_ lamp 1 3 6 8 12 
 1 3  lamp _|____________|_ 6 8 12 
 3  _|____________|_ lamp 1 6 8 12 
 1 3 6  lamp _|____________|_ 8 12 
 3 6  _|____________|_ lamp 1 8 12 
 3 6 8 12  lamp _|____________|_ 1 
 6 8 12  _|____________|_ lamp 1 3 
 1 3 6 8 12  lamp _|____________|_ 
 solution length: 8
 state transitions: 346
 ratio solution length / state transitions: 0.0231214
 minimum branching degree: 1
 average branching degree: 7.42453
 maximum branching degree: 15
 time: 0.28
 Initial = [], right, [1, 3, 6, 8, 12]
 Path = [ ([], right, [1, 3, 6, 8, 12]), ([1, 3], left, [6, 8, 12]), ([3], right, [1, 6, 8, 12]), ([1, 3, 6], left, [8, 12]), ([3, 6], right, [1, 8|...]), ([3, 6|...], left, [1]), ([6|...], right, [...|...]), ([...|...], ..., ...)]
 Cost = 29 
 yes
@ -104,11 +131,11 @@ yes
 solution length: 6
 number of state transitions: 105
-ratio solution length / state transitions: 0.05714285714285714
+ratio solution length / state transitions: 0.0571429
 minimum branching degree: 2
-average branching degree: 3.6315789473684212
+average branching degree: 3.63158
 maximum branching degree: 4
-time: 0.20000000000027285
+time: 0.02
 Path = [(0,0),(0,3),(3,0),(3,3),(4,2),(0,2)],
 Initial = (0,0) ? 
@ -144,14 +171,14 @@ yes
 solution length: 8
 number of state transitions: 12
-ratio solution length / state transitions: 0.6666666666666666
+ratio solution length / state transitions: 0.666667
 minimum branching degree: 1
-average branching degree: 2.0
+average branching degree: 2
 maximum branching degree: 3
-time: 0.021999999999934516
+time: 0.00
 Path = [(0,0),(4,0),(4,3),(0,3),(3,0),(3,3),(4,2),(0,2)],
 Initial = (0,0) ? 
@ -190,9 +217,9 @@ solution length: 6
 number of state transitions: 15
 ratio solution length / state transitions: 0.4
 minimum branching degree: 2
-average branching degree: 3.1333333333333333
+average branching degree: 3.13333
 maximum branching degree: 4
-time: 0.050000000000181899
+time: 0.01
 Cost = 5,
 Path = [[2/1,1/2,1/3,3/3,3/2,3/1,2/2,1/1,2/3],[2/2,1/2,1/3,3/3,3/2,3/1,2/1,1/1,2/3],[2/3,1/2,1/3,3/3,3/2,3/1,2/1,1/1,2/2],[1/3,1/2,2/3,3/3,3/2,3/1,2/1,1/1,2/2],[1/2,1/3,2/3,3/3,3/2,3/1,2/1,1/1,2/2],[2/2,1/3,2/3,3/3,3/2,3/1,2/1,1/1,1/2]],
@ -232,9 +259,9 @@ solution length: 6
 number of state transitions: 15
 ratio solution length / state transitions: 0.4
 minimum branching degree: 2
-average branching degree: 3.1333333333333333
+average branching degree: 3.13333
 maximum branching degree: 4
-time: 0.046000000000276486
+time: 0.02
 Cost = 5,
 Path = [[2/1,1/2,1/3,3/3,3/2,3/1,2/2,1/1,2/3],[2/2,1/2,1/3,3/3,3/2,3/1,2/1,1/1,2/3],[2/3,1/2,1/3,3/3,3/2,3/1,2/1,1/1,2/2],[1/3,1/2,2/3,3/3,3/2,3/1,2/1,1/1,2/2],[1/2,1/3,2/3,3/3,3/2,3/1,2/1,1/1,2/2],[2/2,1/3,2/3,3/3,3/2,3/1,2/1,1/1,1/2]],
--- a/Logtalk/examples/searching/best_first1.lgt
+++ b/Logtalk/examples/searching/best_first1.lgt
@ -31,8 +31,8 @@
 	expand(Path, l(State,F/G), Threshold, Tree, Solved, Solution, Space, Cost) :-
 		F =< Threshold,
-		(bagof(Next/Cost,
+		(bagof(Next/Cost2,
-			(Space::next_state(State, Next, Cost), \+ list::member(Next, Path)),
+			(Space::next_state(State, Next, Cost2), \+ list::member(Next, Path)),
 			Successors) ->
 				succlist(G, Successors, Trees, Threshold, Space),
 				bestf(Trees, F2, Threshold),
--- a/Logtalk/examples/searching/breadth_first1.lgt
+++ b/Logtalk/examples/searching/breadth_first1.lgt
@ -11,9 +11,6 @@
 		parnames is ['Bound']]).
 	:- calls(state_space).
 	:- uses(list).
--- a/Logtalk/examples/searching/hill_climbing1.lgt
+++ b/Logtalk/examples/searching/hill_climbing1.lgt
@ -25,7 +25,6 @@
 		Space::goal_state(State).
 	hill(Space, State, Threshold, Path, Solution, SoFar, Total) :-
 		SoFar < Threshold,
 		findall(
 			(Estimate, Cost, Next),
 			(Space::next_state(State, Next, Cost),
@ -34,9 +33,10 @@
             Estimate is Guess + Cost),
 			States),
 		list::sort(States, SortedStates),
-		list::member((_, Cost, Next), SortedStates),
+		list::member((_, Cost2, Next2), SortedStates),
-		SoFar2 is SoFar + Cost,
+		SoFar2 is SoFar + Cost2,
-		hill(Space, Next, Threshold, [State| Path], Solution, SoFar2, Total).
+		SoFar2 =< Threshold,
 		hill(Space, Next2, Threshold, [State| Path], Solution, SoFar2, Total).
 :- end_object.
--- a/Logtalk/examples/searching/performance.lgt
+++ b/Logtalk/examples/searching/performance.lgt
@ -66,7 +66,7 @@
 		write('average branching degree: '), write(Average), nl,
 		write('maximum branching degree: '), write(Maximum), nl,
 		write('time: '), write(Time), nl,
-		!.
+		::retractall(transitions(_, _, _)).		% clean up for next solution
 	transitions(Number) :-
@ -87,9 +87,8 @@
 			 findall(State2, ::transitions(State1, State2, _), States2),
 			 list::length(States2, Length)),
 			Lengths),
-		list::sort(Lengths, SortedLengths),
+		list::min(Lengths, Minimum),
-		SortedLengths = [Minimum| _],
+		list::max(Lengths, Maximum),
 		list::reverse(SortedLengths, [Maximum| _]),
 		numberlist::sum(Lengths, Sum),
 		list::length(Lengths, Length),
 		Average is Sum / Length.
@ -116,12 +115,14 @@
 	before(_, solve(_, _, _), _) :-
 		!,
 		time::cpu_time(Time),
-		::assertz(start_time(Time)).
+		::retractall(start_time(_)),
 		::asserta(start_time(Time)).
 	before(_, solve(_, _, _, _), _) :-
 		!,
 		time::cpu_time(Time),
-		::assertz(start_time(Time)).
+		::retractall(start_time(_)),
 		::asserta(start_time(Time)).
 	after(_, next_state(S1, S2), _) :-
@ -145,7 +146,8 @@
 	after(_, solve(_, _, Solution), _) :-
 		!,
 		time::cpu_time(Time),
-		::assertz(end_time(Time)),
+		::retractall(end_time(_)),
 		::asserta(end_time(Time)),
 		list::length(Solution, Length),
 		::retractall(solution_length(_)),
 		::asserta(solution_length(Length)).
@ -153,11 +155,11 @@
 	after(_, solve(_, _, Solution, _), _) :-
 		!,
 		time::cpu_time(Time),
-		::assertz(end_time(Time)),
+		::retractall(end_time(_)),
 		::asserta(end_time(Time)),
 		list::length(Solution, Length),
 		::retractall(solution_length(_)),
 		::asserta(solution_length(Length)).
 :- end_object.
--- a/Logtalk/examples/searching/searching.loader
+++ b/Logtalk/examples/searching/searching.loader
@ -1,17 +1,18 @@
 :- initialization(
 	logtalk_load([
-		best_first1,
+		state_space,
 		water_jug,
 		farmer,
 		heuristic_state_space,
 		bridge,
 		eight_puzzle,
 		miss_cann,
 		search_strategy,
 		blind_search1,
 		breadth_first1,
 		depth_first1,
 		eight_puzzle,
 		farmer,
 		heuristic_search1,
-		heuristic_state_space,
+		best_first1,
 		hill_climbing1,
-		miss_cann,
+		performance])).
 		performance,
 		search_strategy,
 		state_space,
 		water_jug])).
--- a/Logtalk/examples/searching/water_jug.lgt
+++ b/Logtalk/examples/searching/water_jug.lgt
@ -31,7 +31,7 @@
 	next_state((X, Y), (Z, 3)) :-
 		X > 0, Y < 3,
-		Aux is X + Y, Aux >= 4,
+		Aux is X + Y, Aux >= 3,
 		Z is X - (3 - Y).
 	next_state((X, Y),(Z, 0)) :-
--- a/Logtalk/examples/sicstus/NOTES
+++ b/Logtalk/examples/sicstus/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -10,5 +10,5 @@ The examples in this folder are adopted from the SICStus Prolog manual.
 To load all objects in this example consult the sicstus.loader utility
 file (note that the *.loader files are Prolog files).
-You will also need to load the follwing files in library directory: 
+You will also need to load the following files in library directory: 
 hierarchies.loader and types.loader.
--- a/Logtalk/examples/sicstus/SCRIPT
+++ b/Logtalk/examples/sicstus/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -9,7 +9,7 @@ Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 | ?- sort(rational)::sort([1/8, 2/7, 6/5, 2/9, 1/3], Sorted).
 Sorted = [1/8, 2/9, 2/7, 1/3, 6/5]
-yes.
+yes
 | ?- sort(colours)::sort([orange, indigo, red, yellow, violet, blue, green], Sorted).
@ -27,19 +27,19 @@ yes
 | ?- red_circle(3)::color(Color).
 Color = red
-yes.
+yes
 | ?- red_circle(3)::area(Area).
 Area = 28.274334
-yes.
+yes
 | ?- red_circle(3)::ancestors(As).
 As = [circle(3, red), ellipse(3, 3, red)]
-yes.
+yes
@ -69,7 +69,7 @@ Side = 2
 Width = 2
 Height = 2
 Area = 4
-yes.
+yes
 | ?- square(2)::current_predicate(Pred).
--- a/Logtalk/examples/sicstus/sicstus.loader
+++ b/Logtalk/examples/sicstus/sicstus.loader
@ -1,13 +1,13 @@
 :- initialization(
 	logtalk_load([
-		circle11,
+		ellipse3,
 		circle2,
 		circle11,
 		red_circle1,
 		colours,
 		math_constants,
 		ellipse3,
 		rational,
 		rectangle2,
 		red_circle1,
 		sort1,
 		square1])).
--- a/Logtalk/examples/symdiff/NOTES
+++ b/Logtalk/examples/symdiff/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/symdiff/SCRIPT
+++ b/Logtalk/examples/symdiff/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -16,7 +16,7 @@ S = 0
 yes
-% diffrentiate and then simplify the expression 2x^3 + x^2 - 4x
+% differentiate and then simplify the expression 2x^3 + x^2 - 4x
 | ?- (2*x**3 + x**2 - 4*x)::diff(D), D::simplify(S).
@ -26,7 +26,7 @@ S = 2*(3*x**2)+2*x-4
 yes
-% diffrentiate and then simplify the expression ln(x^2 + 2x - 7) + 4x
+% differentiate and then simplify the expression ln(x^2 + 2x - 7) + 4x
 | ?- (log(x**2 + 2*x - 7) + 4*x)::diff(D), D::simplify(S).
--- a/Logtalk/examples/viewpoints/NOTES
+++ b/Logtalk/examples/viewpoints/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/viewpoints/SCRIPT
+++ b/Logtalk/examples/viewpoints/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/library/NOTES
+++ b/Logtalk/library/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -8,16 +8,28 @@ Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 This folder contains objects, categories, and protocols that implement
 predicates for dealing with common Prolog types and structures.
-To load all a group of objects, protocols and categories in this 
+To load a group of objects, protocols, and categories in this library 
-library consult the corresponding *.loader utility file.
+consult the corresponding *.loader utility file. Currently, there are 
 seven groups of entities defined:
-Some files represent work in progress and are not loaded by default by 
+	dates
-any loader utility file.
+	debugging
 	events
 	hierarchies
 	metapredicates
 	random
 	types
 There is also a file named all.loader that will load all entities in the 
 seven groups listed above.
 Specific notes about each group of objects, categories, and protocols 
 can be found in the corresponding *.notes files.
 Some files represent work in progress and are not loaded by default by 
 any loader utility file.
 Some of the code in this library is based on public domain Prolog code, 
-in particular, adopted from the Edinburgh Prolog library.
+in particular, code adopted from the Edinburgh Prolog library.
 All source files are formatted using four-spaces tabs.
--- a/Logtalk/library/SCRIPT
+++ b/Logtalk/library/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/library/all.loader
+++ b/Logtalk/library/all.loader
@ -0,0 +1,38 @@
 :- initialization(
 	logtalk_load([
 		datep, date,										% dates
 		timep, time,
 		event_handlersp,									% events
 		event_registryp, event_registry,
 		before_event_registry, after_event_registry,
 		monitorp, monitor,
 		debuggerp,											% debugging
 		debugger, 
 		hierarchyp,											% hierarchies
 		proto_hierarchyp, proto_hierarchy,
 		class_hierarchyp, class_hierarchy,
 		metap, meta,										% metapredicates
 		loopp, loop,
 		randomp,											% random
 		random,
 		termp, term,										% types
 		atomic,
 		atom, callable,
 		characterp, character,
 		number, float, integer, natural,
 		compound,
 		listp, list, difflist,
 		numberlistp, numberlist,
 		varlist,
 		queuep, queue,
 		dictionaryp, bintree,
 		setp, set,
 		comparingp])).
--- a/Logtalk/library/all.notes
+++ b/Logtalk/library/all.notes
@ -0,0 +1,11 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
 Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
 The all.loader file will load all the entities loaded by the other
 loader files.
--- a/Logtalk/library/dates.notes
+++ b/Logtalk/library/dates.notes
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/library/debugging.notes
+++ b/Logtalk/library/debugging.notes
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -9,7 +9,8 @@ Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 To load all objects in this group consult the debugging.loader utility 
 file.
-You will also need to load FIRST the events.loader file.
+You will need to load FIRST the events.loader file otherwise you will get 
 a runtime error.
 The object debugger enables you to:
--- a/Logtalk/library/events.notes
+++ b/Logtalk/library/events.notes
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/library/hierarchies.notes
+++ b/Logtalk/library/hierarchies.notes
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/library/metapredicates.notes
+++ b/Logtalk/library/metapredicates.notes
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/library/random.notes
+++ b/Logtalk/library/random.notes
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/library/setp.lgt
+++ b/Logtalk/library/setp.lgt
@ -121,7 +121,6 @@
 	:- public(subset/2).
 	:- mode(subset(+set, +set), zero_or_one).
 	:- mode(subset(?set, +set), zero_or_more).
 	:- info(subset/2, [
 		comment is 'True if Subset is a subset of Set.',
--- a/Logtalk/library/types.notes
+++ b/Logtalk/library/types.notes
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/manuals/NOTES
+++ b/Logtalk/manuals/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.8.4
+Release 2.9.1
 Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -8,9 +8,9 @@ Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
 To consult the Logtalk documentation open the file index.html with a
 web browser.
-Starting with version 2.6.0, all the pages are being converted to 
+Starting with version 2.6.0, all the pages conform to the HTML 4.01 
-conform to the HTML 4.01 Strict W3C Standard. In a future version,
+Strict W3C Standard. In a future version, they will also be XHTML 1.0 
-they will also be XHTML 1.0 ready. You can change the appearence of 
+ready. You can change the appearence of the pages by changing the 
-the pages by changing the included styles.css cascade style sheet file.
+included styles.css cascade style sheet file. Needless to say, the 
-Needless to say, the manual pages look better in recent web navigator 
+manual pages look better in recent web browser releases that support 
-releases that support both the HTML 4 and CSS1 web standards.
+both the HTML 4 and CSS1 web standards.
--- a/Logtalk/manuals/bibliography.html
+++ b/Logtalk/manuals/bibliography.html
@ -5,7 +5,7 @@
 <head>
 	<title>Logtalk Bibliography</title>
-	<link rel=stylesheet  href="styles.css" type="text/css">
+	<link rel=stylesheet href="styles.css" type="text/css">
 </head>
 <body>
--- a/Logtalk/manuals/index.html
+++ b/Logtalk/manuals/index.html
@ -4,14 +4,14 @@
 <html>
 <head>
-	<title>Logtalk 2.8.4 Documentation</title>
+	<title>Logtalk 2.9.1 Documentation</title>
 	<link rel=stylesheet  href="styles.css" type="text/css">
 </head>
 <body>
 <hr />
-<h1 class="center">Logtalk 2.8.4</h1>
+<h1 class="center">Logtalk 2.9.1</h1>
 <h3 class="center">Documentation</h3>
 <p class="center">
@ -44,7 +44,7 @@ Portugal
 <hr />
 <p class="center">
-Last updated on: February 10, 2001
+Last updated on: November 26, 2001
 </p>
 <p class="center">
 <a href="http://validator.w3.org/check/referer"><img src="vh401.gif" alt="Valid HTML 4.01!" width="88" height="31"></a>
--- a/Logtalk/manuals/refman/builtins/abolish_category1.html
+++ b/Logtalk/manuals/refman/builtins/abolish_category1.html
@ -33,7 +33,7 @@ abolish_category(@category_identifier)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -61,7 +61,7 @@ abolish_category(@category_identifier)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/abolish_events5.html
+++ b/Logtalk/manuals/refman/builtins/abolish_events5.html
@ -33,7 +33,7 @@ abolish_events(@event, @object_identifier, @callable, @object_identifier, @objec
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -63,7 +63,7 @@ abolish_events(@event, @object_identifier, @callable, @object_identifier, @objec
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/abolish_object1.html
+++ b/Logtalk/manuals/refman/builtins/abolish_object1.html
@ -34,7 +34,7 @@ abolish_object(@object_identifier)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -62,7 +62,7 @@ abolish_object(@object_identifier)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/abolish_protocol1.html
+++ b/Logtalk/manuals/refman/builtins/abolish_protocol1.html
@ -33,7 +33,7 @@ abolish_protocol(@protocol_identifier)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -61,7 +61,7 @@ abolish_protocol(@protocol_identifier)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/category_property2.html
+++ b/Logtalk/manuals/refman/builtins/category_property2.html
@ -33,7 +33,7 @@ category_property(?category_identifier, ?category_property)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -57,7 +57,7 @@ category_property(?category_identifier, ?category_property)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/create_category4.html
+++ b/Logtalk/manuals/refman/builtins/create_category4.html
@ -33,7 +33,7 @@ create_category(+category_identifier, +list, +list, +list)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -67,7 +67,7 @@ create_category(+category_identifier, +list, +list, +list)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/create_object4.html
+++ b/Logtalk/manuals/refman/builtins/create_object4.html
@ -33,7 +33,7 @@ create_object(+object_identifier, +list, +list, +list)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -67,7 +67,7 @@ create_object(+object_identifier, +list, +list, +list)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/create_protocol3.html
+++ b/Logtalk/manuals/refman/builtins/create_protocol3.html
@ -33,7 +33,7 @@ create_protocol(+protocol_identifier, +list, +list)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -65,7 +65,7 @@ create_protocol(+protocol_identifier, +list, +list)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/current_category1.html
+++ b/Logtalk/manuals/refman/builtins/current_category1.html
@ -33,7 +33,7 @@ current_category(?category_identifier)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -55,7 +55,7 @@ current_category(?category_identifier)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/current_event5.html
+++ b/Logtalk/manuals/refman/builtins/current_event5.html
@ -33,7 +33,7 @@ current_event(?event, ?object_identifier, ?callable, ?object_identifier, ?object
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -63,7 +63,7 @@ current_event(?event, ?object_identifier, ?callable, ?object_identifier, ?object
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/current_object1.html
+++ b/Logtalk/manuals/refman/builtins/current_object1.html
@ -33,7 +33,7 @@ current_object(?object_identifier)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -55,7 +55,7 @@ current_object(?object_identifier)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/current_protocol1.html
+++ b/Logtalk/manuals/refman/builtins/current_protocol1.html
@ -33,7 +33,7 @@ current_protocol(?protocol_identifier)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -55,7 +55,7 @@ current_protocol(?protocol_identifier)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/define_events5.html
+++ b/Logtalk/manuals/refman/builtins/define_events5.html
@ -33,7 +33,7 @@ define_events(@event, @object_identifier, @callable, @object_identifier, +object
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -65,7 +65,7 @@ define_events(@event, @object_identifier, @callable, @object_identifier, +object
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/extends_object2_3.html
+++ b/Logtalk/manuals/refman/builtins/extends_object2_3.html
@ -33,11 +33,11 @@ extends_object(Prototype, Parent, Scope)
 <pre>
 extends_object(?object_identifier, ?object_identifier)
-extends_object(?object_identifier, ?object_identifier, ?entity_scope)
+extends_object(?object_identifier, ?object_identifier, ?scope)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -46,7 +46,7 @@ extends_object(?object_identifier, ?object_identifier, ?entity_scope)
 		<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>
+			<dd><code>type_error(scope, Scope)</code></dd>
 	</dl>
 </blockquote>
@ -65,7 +65,7 @@ extends_object(?object_identifier, ?object_identifier, ?entity_scope)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/extends_protocol2_3.html
+++ b/Logtalk/manuals/refman/builtins/extends_protocol2_3.html
@ -33,11 +33,11 @@ extends_protocol(Protocol1, Protocol2, Scope)
 <pre>
 extends_protocol(?protocol_identifier, ?protocol_identifier)
-extends_protocol(?protocol_identifier, ?protocol_identifier, ?entity_scope)
+extends_protocol(?protocol_identifier, ?protocol_identifier, ?scope)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -46,7 +46,7 @@ extends_protocol(?protocol_identifier, ?protocol_identifier, ?entity_scope)
 		<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>
+			<dd><code>type_error(scope, Scope)</code></dd>
 	</dl>
 </blockquote>
@ -65,7 +65,7 @@ extends_protocol(?protocol_identifier, ?protocol_identifier, ?entity_scope)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/forall2.html
+++ b/Logtalk/manuals/refman/builtins/forall2.html
@ -33,7 +33,7 @@ forall(+callable, +callable)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -57,7 +57,7 @@ forall(+callable, +callable)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/implements_protocol2_3.html
+++ b/Logtalk/manuals/refman/builtins/implements_protocol2_3.html
@ -36,12 +36,12 @@ implements_protocol(Category, Protocol, Scope)
 implements_protocol(?object_identifier, ?protocol_identifier)
 implements_protocol(?category_identifier, ?protocol_identifier)
-implements_protocol(?object_identifier, ?protocol_identifier, ?entity_scope)
+implements_protocol(?object_identifier, ?protocol_identifier, ?scope)
-implements_protocol(?category_identifier, ?protocol_identifier, ?entity_scope)
+implements_protocol(?category_identifier, ?protocol_identifier, ?scope)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -52,7 +52,7 @@ implements_protocol(?category_identifier, ?protocol_identifier, ?entity_scope)
 		<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>
+			<dd><code>type_error(scope, Scope)</code></dd>
 	</dl>
 </blockquote>
@ -71,7 +71,7 @@ implements_protocol(?category_identifier, ?protocol_identifier, ?entity_scope)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/imports_category2_3.html
+++ b/Logtalk/manuals/refman/builtins/imports_category2_3.html
@ -33,11 +33,11 @@ imports_category(Object, Category, Scope)
 <pre>
 imports_category(?object_identifier, ?category_identifier)
-imports_category(?object_identifier, ?category_identifier, ?entity_scope)
+imports_category(?object_identifier, ?category_identifier, ?scope)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -46,7 +46,7 @@ imports_category(?object_identifier, ?category_identifier, ?entity_scope)
 		<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>
+			<dd><code>type_error(scope, Scope)</code></dd>
 	</dl>
 </blockquote>
@ -65,7 +65,7 @@ imports_category(?object_identifier, ?category_identifier, ?entity_scope)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/instantiates_class2_3.html
+++ b/Logtalk/manuals/refman/builtins/instantiates_class2_3.html
@ -33,11 +33,11 @@ instantiates_class(Instance, Class, Scope)
 <pre>
 instantiates_class(?object_identifier, ?object_identifier)
-instantiates_class(?object_identifier, ?object_identifier, ?entity_scope)
+instantiates_class(?object_identifier, ?object_identifier, ?scope)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -46,7 +46,7 @@ instantiates_class(?object_identifier, ?object_identifier, ?entity_scope)
 		<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>
+			<dd><code>type_error(scope, Scope)</code></dd>
 	</dl>
 </blockquote>
@ -65,7 +65,7 @@ instantiates_class(?object_identifier, ?object_identifier, ?entity_scope)
 <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
+Last updated on: October 21, 2001
 </p>
 <hr />
--- a/Logtalk/manuals/refman/builtins/logtalk_compile1.html
+++ b/Logtalk/manuals/refman/builtins/logtalk_compile1.html
@ -21,8 +21,10 @@
 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.
+Compiles to disk a list of 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. In other words, the files must exist in your current working directory.
-
+</p>
 <p>
 Note that only the errors related to problems in the predicate argument are listed below. Other exceptions may be thrown by the compiler if any of the compiled entities contain errors.
 </p>
 </blockquote>
@ -34,7 +36,7 @@ logtalk_compile(+atom_list)
 </pre>
 </blockquote>
-<h3>Errors</h3>
+<h4>Errors</h4>
 <blockquote>
 	<dl>
@ -64,7 +66,7 @@ logtalk_compile(+atom_list)
 <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
+Last updated on: October 22, 2001
 </p>
 <hr />
--- a/Show More
+++ b/Show More