Logtalk 2.19.0 files.

git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1104 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2004-07-25 18:47:43 +00:00 · 2004-07-25 18:47:43 +00:00 · 2a1fbb6e88
commit 2a1fbb6e88
parent 3801508cdf
141 changed files with 684 additions and 382 deletions
--- a/Logtalk/INSTALL
+++ b/Logtalk/INSTALL
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -16,14 +16,14 @@ easy installation of Logtalk on Unix and Unix-like operating systems.
 INSTALLING FOR A SINGLE USER
-In the case of a single user, the Logtalk directory can simply be 
+In the case of a single user, the Logtalk directory may simply be copied to 
-copied to the user home directory.
+the user home directory.
 INSTALLING FOR MULTIPLE USERS
-In the case of multiple users, the Logtalk directory can be copied to 
+In the case of multiple users, the Logtalk directory can be copied to any 
-any location that its accessible by all the users.
+location that its accessible by all the users.
 Regarding directory and file permissions, it is advisable to make all files 
 read-only in order to avoid user tempering. However, the library and examples 
@ -46,11 +46,11 @@ variable named $LOGTALKHOME pointing to the Logtalk installation for use with
 your Prolog compilers. If you use a csh shell, add the following line to your 
 ~/.cshrc file:
-	setenv LOGTALKHOME "/your/installation/directory/lgt2180"
+	setenv LOGTALKHOME "/your/installation/directory/lgt2190"
 If you use a bash shell, add the following lines to your ~/.profile file:
-	LOGTALKHOME="/your/installation/directory/lgt2180"
+	LOGTALKHOME="/your/installation/directory/lgt2190"
 	export LOGTALKHOME
 When using the provided shell script for installing Logtalk, a symbolic link 
--- a/Logtalk/QUICK_START
+++ b/Logtalk/QUICK_START
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/README
+++ b/Logtalk/README
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -35,7 +35,7 @@ URL:
    http://www.logtalk.org/
-At this address you can also find useful documentation and information
+At this address you can also find additional documentation and information
 about Logtalk.
--- a/Logtalk/RELEASE_NOTES
+++ b/Logtalk/RELEASE_NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -10,6 +10,20 @@ RELEASE NOTES
 =============
 2.19.0 - July 26, 2004
 	Added support for defining more that one entity per file using Logtalk 
 	source metafiles (*.mlgt), which the runtime engine automatically splits 
 	on single entity source files plus loading and compiling helper files.
 	Updated the URL used on the automatically generated XML documenting files 
 	when compiling entities with the option doctype(web).
 	Improved error checking when compiling calls to the {}/1 control construct.
 	Corrected several typos and some outdated links on the Logtalk manuals.
 2.18.0 - July 9, 2004
 	Added caching of method lookups in order to improve message processing 
--- a/Logtalk/UPGRADING
+++ b/Logtalk/UPGRADING
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/NOTES
+++ b/Logtalk/examples/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -9,31 +9,31 @@ Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 This folder contains several examples of Logtalk programs. A brief 
 description of each example is included below.
-Each example contains a NOTES file and a loader utility file that may 
+Each example folder contains a NOTES file and a loader helper file which 
-be used to load all the example entities. In addition, most examples 
+may be used to load all the example entities. In addition, most examples 
 contain a SCRIPT file with sample queries for your to try.
-Most of these examples need objects, protocols, and categories that 
+Most of these examples need objects, protocols, and categories which are 
-are defined in the Logtalk standard library or in other examples, so 
+defined in the Logtalk standard library or in other examples, so you 
-you should load them first (see the NOTES files inside the library 
+should load them first (see the NOTES files inside the library folder and 
-folder and the NOTES file inside each example folder).
+the NOTES file inside each example folder).
 Some examples may redefine objects already loaded from other examples.
 You may want to restart Logtalk after trying each example.
-Some of the examples code have been adopted from public available 
+Some of the examples code have been adopted from public available Prolog 
-Prolog code and from known Prolog text books and are copyrighted by 
+code and from known Prolog text books and are copyrighted by the respective 
-the respective authors.
+authors.
-These are programming examples, meaning that you should study the 
+These are programming examples, meaning that you should study the source 
-source files to fully understand them.
+files to fully understand them.
 All examples are formatted using four spaces tabs.
 By default, compiling an example generates a .xml documenting file for each 
-compiled entity (object, category, or protocol). See the xml sub-directory 
+compiled entity (object, category, or protocol). See the xml folder for 
-for instructions on how to browse the .xml files for on-line reading or how 
+instructions on how to browse the .xml files for on-line reading or how to 
-to convert the files to a print-ready format such as PDF.
+convert the files to a print-ready format such as PDF.
 Here is a short description of each included example:
--- a/Logtalk/examples/birds/NOTES
+++ b/Logtalk/examples/birds/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/bricks/NOTES
+++ b/Logtalk/examples/bricks/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/dcgs/NOTES
+++ b/Logtalk/examples/dcgs/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/dcgs/SCRIPT
+++ b/Logtalk/examples/dcgs/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/dynpred/NOTES
+++ b/Logtalk/examples/dynpred/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/dynpred/SCRIPT
+++ b/Logtalk/examples/dynpred/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/errors/NOTES
+++ b/Logtalk/examples/errors/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/inheritance/SCRIPT
+++ b/Logtalk/examples/inheritance/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/instmethods/NOTES
+++ b/Logtalk/examples/instmethods/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/lo/travellers/NOTES
+++ b/Logtalk/examples/lo/travellers/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/lpa/NOTES
+++ b/Logtalk/examples/lpa/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/metainterpreters/NOTES
+++ b/Logtalk/examples/metainterpreters/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/metainterpreters/SCRIPT
+++ b/Logtalk/examples/metainterpreters/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/metapredicates/NOTES
+++ b/Logtalk/examples/metapredicates/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/mi/NOTES
+++ b/Logtalk/examples/mi/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/miscellaneous/NOTES
+++ b/Logtalk/examples/miscellaneous/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/msglog/NOTES
+++ b/Logtalk/examples/msglog/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/msglog/SCRIPT
+++ b/Logtalk/examples/msglog/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/operators/NOTES
+++ b/Logtalk/examples/operators/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/operators/SCRIPT
+++ b/Logtalk/examples/operators/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/points/NOTES
+++ b/Logtalk/examples/points/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/polygons/NOTES
+++ b/Logtalk/examples/polygons/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/profiling/NOTES
+++ b/Logtalk/examples/profiling/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/puzzles/NOTES
+++ b/Logtalk/examples/puzzles/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/puzzles/SCRIPT
+++ b/Logtalk/examples/puzzles/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/relations/SCRIPT
+++ b/Logtalk/examples/relations/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/roots/NOTES
+++ b/Logtalk/examples/roots/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/searching/NOTES
+++ b/Logtalk/examples/searching/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/searching/SCRIPT
+++ b/Logtalk/examples/searching/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/shapes/NOTES
+++ b/Logtalk/examples/shapes/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/shapes/ch/NOTES
+++ b/Logtalk/examples/shapes/ch/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/shapes/ch/SCRIPT
+++ b/Logtalk/examples/shapes/ch/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/shapes/ph/NOTES
+++ b/Logtalk/examples/shapes/ph/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/shapes/ph/SCRIPT
+++ b/Logtalk/examples/shapes/ph/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/sicstus/NOTES
+++ b/Logtalk/examples/sicstus/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/sicstus/SCRIPT
+++ b/Logtalk/examples/sicstus/SCRIPT
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/symdiff/NOTES
+++ b/Logtalk/examples/symdiff/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/examples/viewpoints/NOTES
+++ b/Logtalk/examples/viewpoints/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/library/NOTES
+++ b/Logtalk/library/NOTES
@ -1,13 +1,12 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
-This folder contains objects, categories, and protocols that implement
+This folder contains some useful objects, categories, and protocols. 
 predicates for dealing with common Prolog types and structures.
 To load a group of objects, protocols, and categories in this library 
 change your Prolog working directory to this folder and then compile 
@ -55,20 +54,21 @@ predicate logtalk_load/1. For example:
 	| ?- logtalk_load(all_loader).
-Specific notes about each group of objects, categories, and protocols 
+Specific notes about each group of objects, categories, and protocols can be 
-can be found in the corresponding *.notes files.
+found in the corresponding *.notes files.
-Some of the files contained in this directory represent work in progress 
+Some of the files contained in this directory represent work in progress and 
-and are not loaded by default by any loader utility file.
+are not loaded by default by any loader utility file.
-Some of the code in this library is based on public domain Prolog code, 
+Some of the code in this library is based on public domain Prolog code, in 
-in particular, code adopted from the Edinburgh Prolog library. The definition 
+particular, code adopted from the Edinburgh Prolog library. The definition 
 of predicate reverse/2 in object list is from Richard O'Keefe and can be found 
 in its book "The Craft of Prolog".
 By default, compiling any group of entities described above generates a .xml 
 documenting file for each compiled entity (object, category, or protocol).
 See the xml sub-directory for instructions on how to browse the .xml files 
-for on-line reading or how to convert the files to print-ready format.
+for on-line reading or how to convert the files to a print-ready format such 
 as PDF.
 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/library/all.notes
+++ b/Logtalk/library/all.notes
@ -1,7 +1,7 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/library/dates.notes
+++ b/Logtalk/library/dates.notes
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -16,5 +16,5 @@ The object date implements some useful calandar date predicates.
 The object time implements some useful time predicates.
 Please note that some of the functionality of these objects depends 
-on the used Prolog support for accessing operating system time and 
+on the chosen Prolog support for accessing operating system time and 
 date values.
--- a/Logtalk/library/debugging.notes
+++ b/Logtalk/library/debugging.notes
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/library/dependents.notes
+++ b/Logtalk/library/dependents.notes
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/library/events.notes
+++ b/Logtalk/library/events.notes
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -16,9 +16,9 @@ implement convenient predicates for registering before and after events.
 The protocol event_handlersp declares the two basic event handler predicates
 (before/3 and after/3). You will need to refer this protocol in your objects
-if you need to use the super control structure (^^/1) with these predicates.
+if you want to use the super control structure (^^/1) with these predicates.
 The monitor object implements more sophisticated event handling predicates.
-Some of the objects assume that the used Prolog compiler defines the 
+Some of the objects assume that the chosen Prolog compiler defines the 
 usual sort/2 built-in predicate.
--- a/Logtalk/library/experimental/NOTES
+++ b/Logtalk/library/experimental/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -11,5 +11,5 @@ utility file:
 	| ?- logtalk_load(hierarchies_loader).
-These objects implement reflection predicates over class/instance 
+These objects implement reflection predicates over class and prototype 
-and prototype hierarchies.
+hierarchies.
--- a/Logtalk/library/metapredicates.notes
+++ b/Logtalk/library/metapredicates.notes
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 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 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/library/systemp.lgt
+++ b/Logtalk/library/systemp.lgt
@ -2,9 +2,9 @@
 :- protocol(systemp).
 	:- info([
-		version is 1.7,
+		version is 1.81,
 		author is 'Portable Operating-System Interface (POSI) initiative',
-		date is 2004/6/24,
+		date is 2004/7/20,
 		comment is 'Portable operating system access protocol.']).
 	:- public(make_directory/1).
@ -15,12 +15,12 @@
 		exceptions is [
 			'Directory is not instantiated' - instantiation_error,
 			'Directory is neither a variable nor a valid file name' - type_error(file_name, 'Directory'),
-			'No permission for creating a new directory' - permission_error(write, 'Directory')]]).
+			'No permission for making a new directory' - permission_error(write, 'Directory')]]).
 	:- public(delete_directory/1).
 	:- mode(delete_directory(+atom), one).
 	:- info(delete_directory/1, [
-		comment is 'Deletes a directory.',
+		comment is 'Deletes a directory (and all of its contents).',
 		argnames is ['Directory'],
 		exceptions is [
 			'Directory is not instantiated' - instantiation_error,
@ -42,7 +42,7 @@
 	:- public(working_directory/1).
 	:- mode(working_directory(?atom), one).
 	:- info(working_directory/1, [
-		comment is 'Current working directory.',
+		comment is 'Current working directory (as an absolute file name).',
 		argnames is ['Directory'],
 		exceptions is [
 			'Directory is neither a variable nor a valid file name' - type_error(file_name, 'Directory')]]).
@ -50,17 +50,16 @@
 	:- public(directory_exists/1).
 	:- mode(directory_exists(+atom), zero_or_one).
 	:- info(directory_exists/1, [
-		comment is 'True if the specified directory exists.',
+		comment is 'True if the specified directory exists (irrespective of directory permissions).',
 		argnames is ['Directory'],
 		exceptions is [
 			'Directory is not instantiated' - instantiation_error,
-			'Directory is neither a variable nor a valid file name' - type_error(file_name, 'Directory'),
+			'Directory is neither a variable nor a valid file name' - type_error(file_name, 'Directory')]]).
 			'No access permission for the directory' - permission_error(read, 'Directory')]]).
 	:- public(directory_files/2).
 	:- mode(directory_files(+atom, -list), one).
 	:- info(directory_files/2, [
-		comment is 'List of all directory files. Returns an empty list if the directory is empty.',
+		comment is 'List of all directory files (returns an empty list if the directory is empty).',
 		argnames is ['Directory', 'Files'],
 		exceptions is [
 			'Directory is not instantiated' - instantiation_error,
@ -82,7 +81,7 @@
 	:- public(rename_file/2).
 	:- mode(rename_file(+atom, +atom), zero_or_one).
 	:- info(rename_file/2, [
-		comment is 'Renames a file (or directory).',
+		comment is 'Renames a file (or a directory).',
 		argnames is ['Old', 'New'],
 		exceptions is [
 			'Old is not instantiated' - instantiation_error,
@ -106,20 +105,30 @@
 			'No read permission to the original file' - permission_error(read, 'Original'),
 			'No write permission to the file copy' - permission_error(write, 'Copy')]]).
-	:- public(symbolic_link/2).
+	:- public(make_symlink/2).
-	:- mode(symbolic_link(+atom, -atom), one).
+	:- mode(make_symlink(+atom, +atom), one).
-	:- info(symbolic_link/2, [
+	:- info(make_symlink/2, [
-		comment is 'Follows a symbolic link returning the target full path.',
+		comment is 'Makes a symbolic link.',
 		argnames is ['Symlink', 'Target'],
 		exceptions is [
 			'Symlink is not instantiated' - instantiation_error,
 			'Target is not instantiated' - instantiation_error,
 			'Symlink is neither a variable nor a valid file name' - type_error(file_name, 'Symlink'),
-			'Symlink is a valid file name but not a symbolic link' - type_error(symlink, 'Symlink'),
+			'Target is neither a variable nor a valid file name' - type_error(file_name, 'Target'),
-			'No access permission to the symbolic link' - permission_error(access, 'Symlink')]]).
+			'No permission for creating the symbolic link' - permission_error(write, 'Symlink')]]).
 	:- public(file_exists/1).
 	:- mode(file_exists(+atom), zero_or_one).
 	:- info(file_exists/1, [
 		comment is 'True if the specified file exists (irrespective of type and file permissions).',
 		argnames is ['File'],
 		exceptions is [
 			'File is not instantiated' - instantiation_error,
 			'File is neither a variable nor a valid file name' - type_error(file_name, 'File')]]).
 	:- public(file_property/2).
-	:- mode(file_property(+atom, +nonvar), zero_or_one).
+	:- mode(file_property(+atom, +compound), zero_or_one).
-	:- mode(file_property(+atom, -nonvar), one_or_more).
+	:- mode(file_property(+atom, -compound), one_or_more).
 	:- info(file_property/2, [
 		comment is 'File properties.',
 		argnames is ['File', 'Property'],
@ -127,13 +136,13 @@
 			'File is not instantiated' - instantiation_error,
 			'File is neither a variable nor a valid file name' - type_error(file_name, 'File'),
 			'File does not exists' - existence_error(file, 'File'),
-			'No access permission to the file' - permission_error(access, 'File'),
+			'No read permission to the file' - permission_error(read, 'File'),
-			'Property is neither a variable nor a file name part' - type_error(file_property, 'Property')]]).
+			'Property is neither a variable nor a file property' - type_error(file_property, 'Property')]]).
 	:- public(current_environment_variable/1).
 	:- mode(current_environment_variable(?atom), zero_or_more).
 	:- info(current_environment_variable/1, [
-		comment is 'Argument is a corrently defined environment variable . Fails if the variable does not exists.',
+		comment is 'Argument is a currently defined environment variable . Fails if the variable does not exists.',
 		argnames is ['Variable'],
 		exceptions is [
 			'Variable is neither a variable nor an atom' - type_error(atom, 'Variable')]]).
@ -173,7 +182,7 @@
 	:- public(time_stamp/1).
 	:- mode(time_stamp(-number), one).
 	:- info(time_stamp/1, [
-		comment is 'Returns the current system-dependent time stamp.',
+		comment is 'Returns a system-dependent time stamp (which can be used for sorting).',
 		argnames is ['Time']]).
 	:- public(local_time/1).
@ -185,17 +194,19 @@
 	:- public(utc_time/1).
 	:- mode(utc_time(?time(?integer, ?integer, ?integer, ?integer, ?integer, ?integer, ?integer)), zero_or_one).
 	:- info(utc_time/1, [
-		comment is 'Universal Coordinated Time (UTC) time.',
+		comment is 'Universal Coordinated Time (UTC).',
 		argnames is [time('Year', 'Month', 'Day', 'Hours', 'Mins', 'Secs', 'Microsecs')]]).
 	:- public(convert_time/2).
 	:- mode(convert_time(+number, ?time(?integer, ?integer, ?integer, ?integer, ?integer, ?integer, ?integer)), zero_or_one).
 	:- mode(convert_time(?number, +time(+integer, +integer, +integer, +integer, +integer, +integer, +integer)), zero_or_one).
 	:- info(convert_time/2, [
-		comment is 'Converts a system-dependent time stamp to calendar local date and time.',
+		comment is 'Converts between system-dependent time stamps and calendar local date and time.',
 		argnames is ['Time', time('Year', 'Month', 'Day', 'Hours', 'Mins', 'Secs', 'Microsecs')],
 		exceptions is [
-			'Time is not instantiated' - instantiation_error,
+			'Neither argument is instantiated' - instantiation_error,
-			'Time is neither a variable nor a valid time stamp' - type_error(time_stamp, 'Variable')]]).
+			'Time stamp is neither a variable nor a valid time stamp' - type_error(time_stamp, 'Time'),
 			'Time structure is neither a variable nor a valid time structure' - type_error(time_structure, 'time(Year, Month, Day, Hours, Mins, Secs, Microsecs)')]]).
 	:- public(cpu_time/1).
 	:- mode(cpu_time(-number), one).
@ -209,24 +220,24 @@
 		comment is 'Host name (default is localhost).',
 		argnames is ['Name']]).
-	:- public(canonical_os_path/2).
+	:- public(canonical_os_file_name/2).
-	:- mode(canonical_os_path(+atom, -atom), one).
+	:- mode(canonical_os_file_name(+atom, -atom), one).
-	:- mode(canonical_os_path(-atom, +atom), one).
+	:- mode(canonical_os_file_name(-atom, +atom), one).
-	:- info(canonical_os_path/2, [
+	:- info(canonical_os_file_name/2, [
-		comment is 'Converts between canonical and operating system dependent paths.',
+		comment is 'Converts between canonical and operating system dependent file names.',
 		argnames is ['Canonical', 'OS']]).
-	:- public(canonical_path/3).
+	:- public(canonical_file_name/3).
-	:- mode(canonical_path(+atom, -atom, -atom), zero_or_one).
+	:- mode(canonical_file_name(+atom, -atom, -atom), one).
-	:- mode(canonical_path(-atom, +atom, -atom), zero_or_one).
+	:- mode(canonical_file_name(-atom, +atom, -atom), one).
-	:- mode(canonical_path(-atom, -atom, +atom), zero_or_one).
+	:- mode(canonical_file_name(-atom, -atom, +atom), one).
-	:- info(canonical_path/3, [
+	:- info(canonical_file_name/3, [
-		comment is 'Converts between relative, absolute, and URL canonical paths.',
+		comment is 'Converts between relative, absolute, and URL canonical file names.',
 		argnames is ['Relative', 'Absolute', 'URL'],
 		exceptions is [
 			'None of the arguments is instantiated' - instantiation_error,
-			'Relative is neither a variable nor a relative path' - type_error(relative_file_name, 'Relative'),
+			'Relative is neither a variable nor a relative file name' - type_error(relative_file_name, 'Relative'),
-			'Absolute is neither a variable nor a absolute path' - type_error(absolute_path, 'Absolute'),
+			'Absolute is neither a variable nor a absolute file name' - type_error(absolute_file_name, 'Absolute'),
 			'URL is neither a variable nor a file name URL' - type_error(url_file_name, 'URL')]]).
 	:- public(relative_file_name/1).
@ -269,7 +280,7 @@
 	:- public(url_file_name/2).
 	:- mode(url_file_name(+atom, ?atom), zero_or_one).
 	:- info(url_file_name/2, [
-		comment is 'Expands a file name into a URL.',
+		comment is 'Expands a file name into a URL file name.',
 		argnames is ['File', 'URL'],
 		exceptions is [
 			'File is not instantiated' - instantiation_error,
@ -277,7 +288,7 @@
 			'URL is neither a variable nor a valid file name URL' - type_error(file_name, 'URL')]]).
 	:- public(file_name_part/2).
-	:- mode(file_name_part(+atom, ?nonvar), zero_or_more).
+	:- mode(file_name_part(+atom, ?compound), zero_or_more).
 	:- info(file_name_part/2, [
 		comment is 'File name parts.',
 		argnames is ['File', 'Part'],
@ -288,14 +299,14 @@
 			'Part is neither a variable nor a file name part' - type_error(file_name_part, 'Port')]]).
 	:- public(file_name_parts/2).
-	:- mode(file_name_parts(+atom, -list), one).
+	:- mode(file_name_parts(+atom, -list(compound)), one).
-	:- mode(file_name_parts(-atom, +list), zero_or_one).
+	:- mode(file_name_parts(-atom, +list(compound)), zero_or_one).
 	:- info(file_name_parts/2, [
 		comment is 'Converts between a file name and its constituent parts (represented as a list of compound terms).',
 		argnames is ['File', 'Parts'],
 		exceptions is [
 			'None of the arguments are instantiated' - instantiation_error,
 			'File is neither a variable nor a valid file name' - type_error(file_name, 'File'),
-			'Parts is neither a variable nor a list' - type_error(list, 'Parts')]]).
+			'Parts is neither a variable nor a list' - type_error(list(compound), 'Parts')]]).
 :- end_protocol.
--- a/Logtalk/library/types.notes
+++ b/Logtalk/library/types.notes
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
@ -12,5 +12,5 @@ file:
 	| ?- logtalk_load(types_loader).
 These objects implement predicates over common Prolog terms and 
-structures like lists, diffrence lists, binary trees, dictionaries, 
+structures such as lists, difference lists, binary trees, queues, 
-and queues.
+dictionaries, and sets.
--- a/Logtalk/manuals/NOTES
+++ b/Logtalk/manuals/NOTES
@ -1,6 +1,6 @@
 =================================================================
 Logtalk - Object oriented extension to Prolog
-Release 2.18.0
+Release 2.19.0
 Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
 =================================================================
--- a/Logtalk/manuals/glossary.html
+++ b/Logtalk/manuals/glossary.html
@ -43,7 +43,7 @@
 <dd>A class that is a specialization, direct or indirectly, of another class.</dd>
 <dt class="glossary"><strong>superclass</strong><a name="superclass"></a></dt>
-<dd>A class from each another class is a specialization (direct or indirectly, via another class).</dd>
+<dd>A class from each another class is a specialization (directly or indirectly via another class).</dd>
 </dl></dd>
@ -64,7 +64,7 @@
 <dd>The hiding of an object implementation. This promotes software reuse by isolating users from implementation details.</dd>
 <dt class="glossary"><strong>entity</strong><a name="entity"></a></dt>
-<dd>Generic name for Logtalk compilation units: objects, categories and protocols.</dd>
+<dd>Generic name for Logtalk compilation units: objects, categories, and protocols.</dd>
 <dt class="glossary"><strong>event</strong><a name="event"></a></dt>
 <dd>The sending of a message to an object. An event can be expressed as an ordered tuple: <code>(Event, Object, Message, Sender)</code>. Logtalk distinguish between the sending of a message - <code>before</code> event - and the return of control to the sender - <code>after</code> event.</dd>
@ -177,7 +177,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 7, 2004</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 22, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/index.html
+++ b/Logtalk/manuals/index.html
@ -8,7 +8,7 @@
 <head>
 	<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
-	<title>Logtalk 2.18.0 Documentation</title>
+	<title>Logtalk 2.19.0 Documentation</title>
 	<link rel="stylesheet" href="styles.css" type="text/css" />
 </head>
@ -18,7 +18,7 @@
 &nbsp;
 </div>
-<h1>Logtalk 2.18.0 Documentation</h1>
+<h1>Logtalk 2.19.0 Documentation</h1>
 <ul>
 	<li><h2><a href="userman/index.html">User Manual</a></h2></li>
@ -37,7 +37,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 8, 2004</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 23, 2004</span></p>
 </div>
 </body>
--- a/Logtalk/manuals/refman/builtins/forall2.html
+++ b/Logtalk/manuals/refman/builtins/forall2.html
@ -50,7 +50,10 @@
 <h4>Examples</h4>
 <blockquote>
-<pre>| ?- forall(member(X, [1, 2, 3]), write(X)).</pre>
+<pre>| ?- forall(member(X, [1, 2, 3]), write(X)).
 123
 yes</pre>
 </blockquote>
 <div class="navbottom">
@ -62,7 +65,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: December 23, 2003</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 22, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/refman/builtins/logtalk_compile1.html
+++ b/Logtalk/manuals/refman/builtins/logtalk_compile1.html
@ -25,12 +25,13 @@
 <blockquote>
 <pre>logtalk_compile(Entity)
-logtalk_compile(Entities)</pre>
+logtalk_compile(Entities)
 logtalk_compile(Metafile)</pre>
 <p>
-Compiles to disk an entity or 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.
+Compiles to disk an entity or 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> for entity source files and <code>.mlgt</code> for source metafiles) 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 the 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.
+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 contains syntax errors.
 </p>
 </blockquote>
@ -74,7 +75,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: December 23, 2003</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 23, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/refman/builtins/logtalk_compile2.html
+++ b/Logtalk/manuals/refman/builtins/logtalk_compile2.html
@ -25,15 +25,16 @@
 <blockquote>
 <pre>logtalk_compile(Entity, Options)
-logtalk_compile(Entities, Options)</pre>
+logtalk_compile(Entities, Options)
 logtalk_compile(Metafile, Options)</pre>
 <p>
-Compiles to disk an 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. In other words, the files must exist in your current working directory.
+Compiles to disk an entity, a list of entities (objects, protocols, or categories), or a source metafile using a list of options. The Logtalk file name extension (by default, <code>.lgt</code> for entity source files and <code>.mlgt</code> for source metafiles) should be omitted. Note that the first argument is a list of entity/file names, not file paths. In other words, the files must exist in the current working directory.
 </p>
 <p>
-For a description of the available compiler options, please <a href="../../userman/installing.html#options">consult</a> the User Manual.
+For a description of the available compiler options, please <a href="../../userman/running.html#options">consult</a> the User Manual.
 </p>
 <p>
-Note that only the errors related to problems in the predicate arguments are listed below. Other exceptions may be thrown by the compiler if any of the compiled entities contain errors.
+Note that only the errors related to problems in the predicate arguments are listed below. Other exceptions may be thrown by the compiler if any of the compiled entities contains syntax errors.
 </p>
 </blockquote>
@ -83,7 +84,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: December 23, 2003</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 23, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/refman/builtins/logtalk_load1.html
+++ b/Logtalk/manuals/refman/builtins/logtalk_load1.html
@ -25,12 +25,13 @@
 <blockquote>
 <pre>logtalk_load(Entity)
-logtalk_load(Entities)</pre>
+logtalk_load(Entities)
 logtalk_load(Metafile)</pre>
 <p>
-Compiles to disk and then loads to memory an entity or 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.
+Compiles to disk and then loads to memory an entity, a list of entities (objects, protocols or categories), or a source metafile using the default compiler options specified in the Logtalk configuration file. The Logtalk file name extension (by default, <code>.lgt</code> for entity source files and <code>.mlgt</code> for source metafiles) 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 the 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 loaded entities contain errors.
+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 loaded entities contains syntax errors.
 </p>
 </blockquote>
@ -74,7 +75,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: December 23, 2003</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 23, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/refman/builtins/logtalk_load2.html
+++ b/Logtalk/manuals/refman/builtins/logtalk_load2.html
@ -25,15 +25,16 @@
 <blockquote>
 <pre>logtalk_load(Entity, Options)
-logtalk_load(Entities, Options)</pre>
+logtalk_load(Entities, Options)
 logtalk_load(Metafile, Options)</pre>
 <p>
-Compiles to disk and then loads to memory an 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. In other words, the files must exist in your current working directory.
+Compiles to disk and then loads to memory an entity, a list of entities (objects, protocols or categories), or a source metafile using a list of options. The Logtalk file name extension  (by default, <code>.lgt</code> for entity source files and <code>.mlgt</code> for source metafiles) should be omitted. Note that the first argument is a list of entity/file names, not file paths. In other words, the files must exist in the current working directory.
 </p>
 <p>
-For a description of the available compiler options, please <a href="../../userman/installing.html#options">consult</a> the User Manual.
+For a description of the available compiler options, please <a href="../../userman/running.html#options">consult</a> the User Manual.
 </p>
 <p>
-Note that only the errors related to problems in the predicate arguments are listed below. Other exceptions may be thrown by the compiler if any of the loaded entities contain errors.
+Note that only the errors related to problems in the predicate arguments are listed below. Other exceptions may be thrown by the compiler if any of the loaded entities contains syntax errors.
 </p>
 </blockquote>
@ -83,7 +84,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: December 23, 2003</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 23, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/refman/control/to_object2.html
+++ b/Logtalk/manuals/refman/control/to_object2.html
@ -64,7 +64,13 @@ Sends a message to an object. The message argument must match a public predicate
 <h4>Examples</h4>
 <blockquote>
-<pre>| ?- list::member(X, [1, 2, 3]).</pre>
+<pre>| ?- list::member(X, [1, 2, 3]).
 X = 1 ;
 X = 2 ;
 X = 3
 yes
 </pre>
 </blockquote>
 <div class="navbottom">
@ -76,7 +82,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: December 23, 2003</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 22, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/refman/directives/op3.html
+++ b/Logtalk/manuals/refman/directives/op3.html
@ -26,7 +26,7 @@
 <blockquote>
 <pre>op(Precedence, Associativity, Operator)</pre>
 	<p>
-	Declares operators.
+	Declares operators. Operators declared inside objects and categories have local scope.
 	</p>
 </blockquote>
@ -55,7 +55,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: February 11, 2004</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 23, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/refman/directives/private1.html
+++ b/Logtalk/manuals/refman/directives/private1.html
@ -24,9 +24,9 @@
 <h4>Description</h4>
 <blockquote>
-<pre>private(Predicate)
+<pre>private(Functor/Arity)
-private(Predicate1, Predicate2, ...)
+private(Functor1/Arity1, Functor2/Arity2, ...)
-private([Predicate1, Predicate2, ...])</pre>
+private([Functor1/Arity1, Functor2/Arity2, ...])</pre>
 <p>
 	Declares private predicates. A private predicate can only be called from the object containing the private directive.
 </p>
@ -57,7 +57,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: December 23, 2003</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 23, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/refman/directives/protected1.html
+++ b/Logtalk/manuals/refman/directives/protected1.html
@ -24,9 +24,9 @@
 <h4>Description</h4>
 <blockquote>
-<pre>protected(Predicate)
+<pre>protected(Functor/Arity)
-protected(Predicate1, Predicate2, ...)
+protected(Functor1/Arity1, Functor2/Arity2, ...)
-protected([Predicate1, Predicate2, ...])</pre>
+protected([Functor1/Arity1, Functor2/Arity2, ...])</pre>
 <p>
 	Declares protected predicates. A protected predicate can only be called from the object containing the declaration or from an object that inherits the declaration.
 </p>
@ -58,7 +58,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: December 23, 2003</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 23, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/refman/directives/public1.html
+++ b/Logtalk/manuals/refman/directives/public1.html
@ -24,9 +24,9 @@
 <h4>Description</h4>
 <blockquote>
-<pre>public(Predicate)
+<pre>public(Functor/Arity)
-public(Predicate1, Predicate2, ...)
+public(Functor1/Arity1, Functor2/Arity2, ...)
-public([Predicate1, Predicate2, ...])</pre>
+public([Functor1/Arity1, Functor2/Arity2, ...])</pre>
 <p>
 	Declares public predicates.  A public predicate can be called from any object.
 </p>
@ -58,7 +58,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: December 23, 2003</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 23, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/refman/index.html
+++ b/Logtalk/manuals/refman/index.html
@ -250,7 +250,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 7, 2004</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 22, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/tutorial/attributes.html
+++ b/Logtalk/manuals/tutorial/attributes.html
@ -49,7 +49,6 @@ When defining category predicates, we need to remember that a category can be im
 <pre>
    :- category(attributes).
        :- public(set_attribute/2).
        :- mode(set_attribute(+nonvar, +nonvar), one).
@ -66,24 +65,19 @@ When defining category predicates, we need to remember that a category can be im
        :- mode(attribute_(?nonvar, ?nonvar), zero_or_more).
        :- dynamic(attribute_/2).
        set_attribute(Attribute, Value):-
            ::retractall(attribute_(Attribute, _)),
            ::assertz(attribute_(Attribute, Value)).
        get_attribute(Attribute, Value):-
            ::attribute_(Attribute, Value).
        del_attribute(Attribute, Value):-
            ::retract(attribute_(Attribute, Value)).
        del_attributes(Attribute, Value):-
            ::retractall(attribute_(Attribute, Value)).
    :- end_category.
 </pre>
 <p>
@ -136,13 +130,13 @@ After compiling and loading this object and our category, we can now try queries
 <h2>Summary<a name="summary"></a></h2>
 <ul>
-	<li>Categories are similar to objects: we just put our predicate directives and definitions bracketed by opening and ending category directives.</li>
+	<li>Categories are similar to objects: we just write our predicate directives and definitions bracketed by opening and ending category directives.</li>
 </ul>
 <ul>
 	<li>An object reuses a category by importing it. The imported predicates behave as if they have been defined in the object itself.</li>
 </ul>
 <ul>
-	<li>When do we use a category instead of an object? Whenever we have a set of closely related predicates that we want to reuse in several, unrelated, objects.</li>
+	<li>When do we use a category instead of an object? Whenever we have a set of closely related predicates that we want to reuse in several, unrelated, objects. Categories can be interpreted as object building components.</li>
 </ul>
 <div class="navbottom">
@ -154,7 +148,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: December 23, 2003</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 22, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/tutorial/index.html
+++ b/Logtalk/manuals/tutorial/index.html
@ -61,7 +61,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: April 25, 2003</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 22, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/tutorial/lists.html
+++ b/Logtalk/manuals/tutorial/lists.html
@ -39,35 +39,26 @@ We will start by defining an object, <code>list</code>, containing predicate def
 <pre>
    :- object(list).
        :- public(append/3).
        :- public(length/2).
        :- public(member/2).
        append([], List, List).
        append([Head| Tail], List, [Head| Tail2]) :-
            append(Tail, List, Tail2).
        length(List, Length) :-
            length(List, 0, Length).
        length([], Length, Length).
        length([_| Tail], Acc, Length) :-
            Acc2 is Acc + 1,
            length(Tail, Acc2, Length).
        member(Element, [Element| _]).
        member(Element, [_| List]) :-
            member(Element, List).
    :- end_object.
 </pre>
 <p>
@ -77,7 +68,7 @@ What is different here from a regular Prolog program? The definitions of the lis
 After we copy the object code to a text file and saved it under the name <code>list.lgt</code>, we need to change the Prolog working directory to the one used to save our file (consult your Prolog compiler reference manual). Then, after starting Logtalk (see the <a title="Consult user manual" href="../userman/installing.html#running">Installing and running Logtalk</a> session on the User Manual), we can compile and load the object using the <a title="Consult reference manual" href="../refman/builtins/logtalk_load1.html"><code>logtalk_load/1</code></a> Logtalk built-in predicate:
 </p>
 <pre>
-    | ?- logtalk_load([list]).
+    | ?- logtalk_load(list).
    object list loaded
    yes
@ -103,7 +94,7 @@ or:
    yes
 </pre>
 <p>
-The infix operator <a title="Consult reference manual" href="../refman/control/to_object2.html"><code>::/2</code></a> is used in Logtalk to send a message to an object. The message must match a public object predicate. If we try to call a non-public predicate like the <code>length/3</code> auxiliar predicate an exeption will be generated:
+The infix operator <a title="Consult reference manual" href="../refman/control/to_object2.html"><code>::/2</code></a> is used in Logtalk to send a message to an object. The message must match a public object predicate. If we try to call a non-public predicate such as the <code>length/3</code> auxiliary predicate an exception will be generated:
 </p>
 <pre>
    | ?- list::length([1, 2, 3], 0, L).
@ -115,23 +106,21 @@ The infix operator <a title="Consult reference manual" href="../refman/control/t
            user)
 </pre>
 <p>
-The error term describes the type of error, the message that caused the exeption, and the sender of the message (in this case, the pseudo-object <code>user</code>  because we are sending the message from the top-level interpreter).
+The error term describes the type of error, the message that caused the exception, and the sender of the message (in this case, the pseudo-object <code>user</code>  because we are sending the message from the top-level interpreter).
 </p>
 <h2>Defining a list protocol<a name="protocol"></a></h2>
 <p>
-As we saw in the above example, a Logtalk object may contain predicate directives and predicate definitions. The set of predicate directives defines what we call the object's <em>protocol</em> or interface. An interface may have several implementations. For instance, we may want to define a new object that implements the list predicates using difference lists. However, we do not want to repeat the predicate directives in the new object. Therefore, what we need is to split the object's protocol from the object's predicate definitions by defining a new Logtalk entity called a protocol. Logtalk protocols are compilations units, at the same level as objects and categories. That said, let us define a <code>listp</code> protocol:
+As we saw in the above example, a Logtalk object may contain predicate directives and predicate definitions (clauses). The set of predicate directives defines what we call the object's <em>protocol</em> or interface. An interface may have several implementations. For instance, we may want to define a new object that implements the list predicates using difference lists. However, we do not want to repeat the predicate directives in the new object. Therefore, what we need is to split the object's protocol from the object's implementation by defining a new Logtalk entity known as a protocol. Logtalk protocols are compilations units, at the same level as objects and categories. That said, let us define a <code>listp</code> protocol:
 </p>
 <pre>
    :- protocol(listp).
        :- public(append/3).
        :- public(length/2).
        :- public(member/2).
    :- end_protocol.
 </pre>
 <p>
@ -140,7 +129,6 @@ Similar to what we have done for objects, we use the directives <a title="Consul
 <pre>
    :- protocol(listp).
        :- public(append/3).
        :- mode(append(?list, ?list, ?list), zero_or_more).
@ -150,25 +138,21 @@ Similar to what we have done for objects, we use the directives <a title="Consul
        :- public(member/2).
        :- mode(member(?term, ?list), zero_or_more).
    :- end_protocol.
 </pre>
 <p>
-Now we need to change our definition of the <code>list</code> object. We remove the predicate directives and state that the object implements the <code>listp</code> protocol:
+We now need to change our definition of the <code>list</code> object by removing the predicate directives and by declaring that the object implements the <code>listp</code> protocol:
 </p>
 <pre>
    :- object(list,
    	implements(listp)).
        append([], List, List).
        append([Head| Tail], List, [Head| Tail2]) :-
            append(Tail, List, Tail2).
        ...
    :- end_object.
 </pre>
 <p>
@ -178,12 +162,9 @@ The protocol declared in <code>listp</code> may now be alternatively implemented
    :- object(difflist,
        implements(listp).
        append(L1-X, X-L2, L1-L2).
        ...
    :- end_object.
 </pre>
@ -205,7 +186,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: December 23, 2003</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 22, 2004</span></p>
 </div>
 </body>
 </html>
--- a/Logtalk/manuals/tutorial/profiling.html
+++ b/Logtalk/manuals/tutorial/profiling.html
@ -80,10 +80,8 @@ Our profiler will be named <code>stop_watch</code>. It must define event handler
 <pre>
    :- object(stop_watch).
        :- uses(time).
        before(Object, Message, Sender) :-
            write(Object), write(' &lt;-- '), writeq(Message),
            write(' from '), write(Sender), nl, write('STARTING at '),
@ -94,7 +92,6 @@ Our profiler will be named <code>stop_watch</code>. It must define event handler
            write(' from '), write(Sender), nl, write('ENDING at '),
            time::cpu_time(Seconds), write(Seconds), write(' seconds'), nl.
    :- end_object.
 </pre>
 <p>
@ -162,7 +159,7 @@ Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a
 </div>
 <div class="footer">
-<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: December 23, 2003</span></p>
+<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 22, 2004</span></p>
 </div>
 </body>
 </html>
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