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pmoura 2004-09-14 23:11:12 +00:00
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23
Logtalk/BIBLIOGRAPHY
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@ -16,16 +16,37 @@
}
@techreport{pmoura00,
@unpublished{pmoura00c,
Author = "Paulo Moura",
Title = "{Category-Based Composition in Object-Oriented Languages}",
month = nov,
year = 2000,
howpublished = "\url{http://www.logtalk.org/papers/categories_ecoop.pdf}",
annote = "Submitted to ECOOP 2001"
}
@techreport{pmoura00b,
author = "Paulo Moura",
title = "{Logtalk 2.6 Documentation}",
institution = "University of Beira Interior, Portugal",
number = "DMI 2000/1",
month = jul,
year = 2000,
howpublished = "\url{http://www.logtalk.org/files/trdmi20001a4.pdf.gz}"
}
@unpublished{pmoura00a,
Author = "Paulo Moura",
Title = "{Category-Based Composition in Object-Oriented Languages}",
month = apr,
year = 2000,
howpublished = "\url{http://www.logtalk.org/papers/categories_oopsla.pdf}",
annote = "Submitted to OOPSLA 2000"
}
@article{pmoura99,
author = "Paulo Moura",
title = "{Porting Prolog: Notes on porting a Prolog program to 22 Prolog compilers or the relevance of the ISO Prolog standard}",

21
Logtalk/INSTALL
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@ -1,17 +1,18 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================
Installing Logtalk is just a matter of decompressing the downloaded
archive and copying the resulting directory to a suitable location.
Installing Logtalk is just a matter of decompressing the downloaded archive
and copying the resulting directory to a suitable location.
The Logtalk directory can reside in any user accessible location.
This location depends on the working environment and on the number
of users. The "misc" sub-directory contains some shell scripts for
easy installation of Logtalk on Unix and Unix-like operating systems.
This location depends on the working environment and on the number of users.
The "misc" sub-directory contains some shell scripts for easy installation
of Logtalk on Windows, Unix and Unix-like operating systems.
INSTALLING FOR A SINGLE USER
@ -49,12 +50,12 @@ execution path.
If you use a csh shell, add the following line to your ~/.cshrc file:
setenv LOGTALKHOME /your/installation/directory/lgt2201
setenv LOGTALKHOME /your/installation/directory/lgt2210
setenv PATH $PATH:$LOGTALKHOME/xml:$LOGTALKHOME/misc
If you use a bash shell, add the following lines to your ~/.profile file:
LOGTALKHOME=/your/installation/directory/lgt2201
LOGTALKHOME=/your/installation/directory/lgt2210
export LOGTALKHOME
PATH=$PATH:$LOGTALKHOME/xml:$LOGTALKHOME/misc
export PATH
@ -72,8 +73,8 @@ file (you will need to reboot after editing the file):
SET LOGTALKHOME=C:\your\installation\folder\
In Windows NT/2000/XP, environment variables are defined using the System
properties control panel (if you are a system administrator, you may define
LOGTALKHOME as a system variable, otherwise define it as a user variable).
properties control panel (if you are a system administrator, you should use
the JScript install script provided in the "misc" sub-directory).
CREATING NEW PROLOG TOP-LEVELS FOR AUTOMATIC LOADING OF LOGTALK

2
Logtalk/QUICK_START
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/README
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

51
Logtalk/RELEASE_NOTES
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================
@ -10,6 +10,55 @@ RELEASE NOTES
=============
2.21.0 - September 14, 2004
Added a new predicate directive, alias/3, which allows the definition of
alternative predicate names in order to improve readability of inherited
features and to solve conflicts between implemented, imported, or inherited
predicates.
Added new example, "aliases", illustrating the use of the new alias/3
predicate directive for improving readability of inherited features.
Added new example, "diamonds", illustrating problems and solutions for the
"diamond problem" (multi-inheritance conflicts and ambiguities) using the
new alias/3 predicate directive.
Allow categories to import other categories, i.e. allow categories to be
defined as a composition of other categories. This feature should only be
used when extending a category without breaking its functional cohesion
(for example, when a modified version of a category is needed for importing
into several unrelated objects).
Added new example, "engines", illustrating importing a category from another
category.
Updated the syntax coloring configuration files for the supported text
editors for the new alias/3 predicate directive.
Added autocomplete strings for Logtalk methods and for Logtalk and Prolog
built-in predicates and directives to the SubEthaEdit 2.x text editor.
Corrected a bug which prevented compilation of metafiles containing
parametric entities.
2.20.2 - August 31, 2004
Added a Windows JScript script for installing Logtalk. Improved the Windows
JScript scripts used for easy integration of Logtalk with selected Prolog
compilers.
Improved user manual section on defining object and category metapredicates
and on calling non-stardard Prolog built-in metapredicates. Improved the
description of some compiler options.
Added some files missing from the "errors" example (which should have been
included in the previous release).
Added basic syntax coloring support for the BBEdit 8.x text editor.
2.20.1 - August 19, 2004
Added Windows JScript scripts for easy integration of Logtalk with CIAO and

2
Logtalk/UPGRADING
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

14
Logtalk/examples/NOTES
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================
@ -38,6 +38,10 @@ convert the files to a print-ready format such as PDF.
Here is a short description of each included example:
aliases
example of using the alias/3 predicate directive to provide alternative
names to inherited predicates in order to improve readability
birds
bird identification expert system
example adopted from the Adventure in Prolog Amzi! book
@ -51,9 +55,17 @@ classvars
dcgs
examples of using DCG rules inside objects and categories
diamonds
examples of problems and solutions for the "diamond problem"
(multi-inheritance conflicts and ambiguities)
dynpred
example of using some of the built-in database handling methods
engines
example of category composition (importation of categories by other
categories) using car engines
errors
example showing the Logtalk compiler warning and error reporting

18
Logtalk/examples/aliases/NOTES Normal file
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@ -0,0 +1,18 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================
To load all entities in this example compile and load the loader file:
| ?- logtalk_load(loader).
or, in alternative, compile and load the example metafile:
| ?- logtalk_load(aliases).
For a description of this example, please see the comments in the
aliases.mlgt metafile.

50
Logtalk/examples/aliases/SCRIPT Normal file
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@ -0,0 +1,50 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================
% start by loading the example:
| ?- logtalk_load(loader).
...
% check the object square(_) public protocol:
| ?- square(_)::current_predicate(Predicate).
Predicate = side/1 ;
Predicate = width/1 ;
Predicate = height/1 ;
Predicate = area/1
yes
% test the side/1 alias:
| ?- square(2)::side(Side).
Side = 2
yes
% check the object circle(_) public protocol:
| ?- circle(_)::current_predicate(Predicate).
Predicate = r/1 ;
Predicate = rx/1 ;
Predicate = ry/1 ;
Predicate = area/1
yes
% test the r/1 alias:
| ?- circle(3)::r(Radius).
Radius = 3
yes

70
Logtalk/examples/aliases/aliases.mlgt Normal file
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@ -0,0 +1,70 @@
/*
This example illustrates the use of the predicate directive alias/3 for
defining alternative names for inherited predicates.
*/
% first, we define a simple parametric object for representing rectangles:
:- object(rectangle(_Width, _Height)).
:- public(width/1).
:- public(height/1).
:- public(area/1).
width(Width) :-
parameter(1, Width).
height(Height) :-
parameter(2, Height).
area(Area) :-
::width(Width),
::height(Height),
Area is Width*Height.
:- end_object.
% next, we define a square object which adds an alias, side/1, for the
% inherited predicate width/1:
:- object(square(Side),
extends(rectangle(Side, Side))).
:- alias(rectangle(_, _), width/1, side/1).
:- end_object.
% a similar example can be defined using ellipses and circles:
:- object(ellipse(_RX, _RY)).
:- public(rx/1).
:- public(ry/1).
:- public(area/1).
rx(Rx) :-
parameter(1, Rx).
ry(Ry) :-
parameter(2, Ry).
area(Area) :-
::rx(Rx),
::ry(Ry),
Area is Rx*Ry*3.1415927.
:- end_object.
% in this case, we define an alias named r/1 for the inherited
% predicate rx/1:
:- object(circle(Radius),
extends(ellipse(Radius, Radius))).
:- alias(ellipse(_, _), rx/1, r/1).
:- end_object.

4
Logtalk/examples/aliases/loader.lgt Normal file
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@ -0,0 +1,4 @@
:- initialization(
logtalk_load([
aliases])).

2
Logtalk/examples/birds/NOTES
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/birds/SCRIPT
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/bricks/NOTES
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/bricks/SCRIPT
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/classvars/NOTES
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/classvars/SCRIPT
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/dcgs/NOTES
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/dcgs/SCRIPT
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

56
Logtalk/examples/diamonds/NOTES Normal file
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@ -0,0 +1,56 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================
This example illustrates some variants of the "diamond problem"
(multi-inheritance conflicts and ambiguities) and its respective
solutions on Logtalk.
This classical problem can be simply described by constructing a
"diamond" of objects and inheritance links as follows:
A -- contains default definition for a predicate m/0
/ \
B C -- contains redefinitions of the predicate m/0
\ /
D -- inherits both redefinitions of the predicate m/0
As such, the object D inherits two conflicting definitions for the
predicate m/0, one from object B and one from object C. If we send
the message m/0 to object D, is ambiguous which inherited definition
should be used to answer it. Depending on the nature of the objects
A, B, C, and D, the correct answer can be the redefinition of m/0 in
object B, the redefinition m/0 in object C, or both redefinitions.
A programming language supporting multi-inheritance should provide
programming mechanisms allowing easy implementation of each possible
solution.
Note that, in the context of Logtalk, the diamond problem may occur with
prototype hierarchies, class hierarchies, protocol hierarchies, or when
using category composition.
This example deals with three variants of the diamond problem, illustrated
using prototype hierarchies:
diamond1
illustrates the inherited definition which is visible due to the
Logtalk predicate lookup algorithm
diamond2
presents a solution for making the overridden inherited definition
the visible one
diamond3
presents a solution which allows both inherited definitions to be
used in D
To load all entities in this example compile and load the loader file:
| ?- logtalk_load(loader).
To load only a specific variant, compile and load the respective metafile.
For example:
| ?- logtalk_load(diamond2).

45
Logtalk/examples/diamonds/SCRIPT Normal file
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@ -0,0 +1,45 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================
% start by loading the example:
| ?- logtalk_load(loader).
...
% first variant of the "diamond problem", defined in the "diamond1" metafile:
| ?- d1::m.
Redefinition of method m/0 in object b1
yes
% second variant of the "diamond problem", defined in the "diamond2" metafile:
| ?- d2::m.
Redefinition of method m/0 in object c2
yes
% third variant of the "diamond problem", defined in the "diamond3" metafile:
| ?- d3::b3_m.
Redefinition of method m/0 in object b3
yes
| ?- d3::c3_m.
Redefinition of method m/0 in object c3
yes
| ?- d3::m.
Redefinition of method m/0 in object b3
yes

57
Logtalk/examples/diamonds/diamond1.mlgt Normal file
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@ -0,0 +1,57 @@
/*
These metafile objects illustrate a variant of the "diamond problem" using
a prototype hierarchy.
In this simple case, the inherited definition which will be used in the
bottom object is determined by the Logtalk predicate lookup algorithm.
*/
% root object, declaring and defining a predicate m/0:
:- object(a1).
:- public(m/0).
m :-
this(This),
write('Default definition of method m/0 in object '),
write(This), nl.
:- end_object.
% an object descending from the root object, which redefines predicate m/0:
:- object(b1,
extends(a1)).
m :-
this(This),
write('Redefinition of method m/0 in object '),
write(This), nl.
:- end_object.
% another object descending from the root object, which also redefines predicate m/0:
:- object(c1,
extends(a1)).
m :-
this(This),
write('Redefinition of method m/0 in object '),
write(This), nl.
:- end_object.
% bottom object, descending from the two previous objects and, as such, inheriting
% two definitions for the predicate m/0:
:- object(d1,
extends(b1, c1)).
:- end_object.

64
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@ -0,0 +1,64 @@
/*
These metafile objects illustrate a variant of the "diamond problem" using
a prototype hierarchy.
In this simple case, a solution for making the overridden definition inherited
by the bottom object the visible one is implemented using the alias/3 predicate
directive.
*/
% root object, declaring and defining a predicate m/0:
:- object(a2).
:- public(m/0).
m :-
this(This),
write('Default definition of method m/0 in object '),
write(This), nl.
:- end_object.
% an object descending from the root object, which redefines predicate m/0:
:- object(b2,
extends(a2)).
m :-
this(This),
write('Redefinition of method m/0 in object '),
write(This), nl.
:- end_object.
% another object descending from the root object, which also redefines predicate m/0:
:- object(c2,
extends(a2)).
m :-
this(This),
write('Redefinition of method m/0 in object '),
write(This), nl.
:- end_object.
% bottom object, descending from the two previous objects and, as such, inheriting
% two definitions for the predicate m/0; the overridden definition inherited from
% object "c2" is renamed using the alias/3 directive and then we redefined the
% predicate m/0 to call the renamed definition:
:- object(d2,
extends(b2, c2)).
:- alias(c2, m/0, c2_m/0).
m :-
::c2_m.
:- end_object.

61
Logtalk/examples/diamonds/diamond3.mlgt Normal file
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@ -0,0 +1,61 @@
/*
These metafile objects illustrate a variant of the "diamond problem" using
a prototype hierarchy.
In this simple case, a solution is presented for making two conflicting
definitions inherited by the bottom object visible through the use of the
alias/3 predicate directive.
*/
% root object, declaring and defining a predicate m/0:
:- object(a3).
:- public(m/0).
m :-
this(This),
write('Default definition of method m/0 in object '),
write(This), nl.
:- end_object.
% an object descending from the root object, which redefines predicate m/0:
:- object(b3,
extends(a3)).
m :-
this(This),
write('Redefinition of method m/0 in object '),
write(This), nl.
:- end_object.
% another object descending from the root object, which also redefines predicate m/0:
:- object(c3,
extends(a3)).
m :-
this(This),
write('Redefinition of method m/0 in object '),
write(This), nl.
:- end_object.
% bottom object, descending from the two previous objects and, as such, inheriting
% two definitions for the predicate m/0; both inherited definitions are renamed
% using the alias/3 directive:
:- object(d3,
extends(b3, c3)).
:- alias(b3, m/0, b3_m/0).
:- alias(c3, m/0, c3_m/0).
:- end_object.

6
Logtalk/examples/diamonds/loader.lgt Normal file
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@ -0,0 +1,6 @@
:- initialization(
logtalk_load([
diamond1,
diamond2,
diamond3])).

2
Logtalk/examples/dynpred/NOTES
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/dynpred/SCRIPT
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

18
Logtalk/examples/engines/NOTES Normal file
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@ -0,0 +1,18 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================
To load all entities in this example compile and load the loader file:
| ?- logtalk_load(loader).
or, in alternative, compile and load the example metafile:
| ?- logtalk_load(engines).
For a description of this example, please see the comments in the
engines.mlgt metafile.

62
Logtalk/examples/engines/SCRIPT Normal file
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@ -0,0 +1,62 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================
% start by loading the example:
| ?- logtalk_load(loader).
...
% both cars provide the same interface, declared in the protocol
% that is implemented by the categories imported by each object:
| ?- sedan::current_predicate(P).
P = reference/1 ;
P = capacity/1 ;
P = cylinders/2 ;
P = horsepower_rpm/2 ;
P = bore_stroke/2 ;
P = fuel/1
yes
| ?- coupe::current_predicate(P).
P = reference/1 ;
P = capacity/1 ;
P = cylinders/2 ;
P = horsepower_rpm/2 ;
P = bore_stroke/2 ;
P = fuel/1 ;
yes
% the sedan engine properties are the ones defined in the corresponding
% imported category (classic):
| ?- sedan::(reference(Name), cylinders(Cylinders), horsepower_rpm(HP, RPM)).
Name = 'M180.940'
Cylinders = 6
HP = 94
RPM = 4800
yes
% the coupe engine properties are the ones defined in the corresponding
% imported category (sport) plus the ones inherited from the top category
% (classic) which are not overridden:
| ?- coupe::(reference(Name), cylinders(Cylinders), horsepower_rpm(HP, RPM)).
Name = 'M180.941'
Cylinders = 6
HP = 110
RPM = 5000
yes

67
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@ -0,0 +1,67 @@
/*
This is a simple example of category composition, i.e. importation of
categories by other categories in order to provide modified components
for building objects, using car engines.
The example defines a car engine protocol (enginep), a standard engine
(classic), and an improved version of it (sport). Both engines are then
imported in two car models (sedan and coupe).
*/
% first we define a protocol for describing the characteristics of an engine:
:- protocol(enginep).
:- public(reference/1).
:- public(capacity/1).
:- public(cylinders/1).
:- public(horsepower_rpm/2).
:- public(bore_stroke/2).
:- public(fuel/1).
:- end_protocol.
% second, we can define a typical engine as a category, which will be used
% when "assembling" cars:
:- category(classic,
implements(enginep)).
reference('M180.940').
capacity(2195).
cylinders(6).
horsepower_rpm(94, 4800).
bore_stroke(80, 72.8).
fuel(gasoline).
:- end_category.
% next, we define a souped up version of the previous engine, which differs
% from the standard one only in its reference and in its horsepower:
:- category(sport,
imports(classic)).
reference('M180.941').
horsepower_rpm(110, 5000).
:- end_category.
% with engines (and other components), we may start "assembling" some cars:
:- object(sedan,
imports(classic)).
:- end_object.
:- object(coupe,
imports(sport)).
:- end_object.

4
Logtalk/examples/engines/loader.lgt Normal file
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@ -0,0 +1,4 @@
:- initialization(
logtalk_load([
engines])).

2
Logtalk/examples/errors/NOTES
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/inheritance/NOTES
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/inheritance/SCRIPT
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/instmethods/NOTES
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/instmethods/SCRIPT
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/lo/NOTES
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/lo/planner/NOTES
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/lo/planner/SCRIPT
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
=================================================================

2
Logtalk/examples/lo/travellers/NOTES
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@ -1,6 +1,6 @@
=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.20.1
Release 2.21.0
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<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>Logtalk 2.20.1 Documentation</title>
<title>Logtalk 2.21.0 Documentation</title>
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&nbsp;
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<h1>Logtalk 2.20.1 Documentation</h1>
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<ul>
<li><h2><a href="userman/index.html">User Manual</a></h2></li>
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