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Logtalk - Object oriented extension to Prolog
Release 2.29.4

Copyright (c) 1998-2007 Paulo Moura.  All Rights Reserved.
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% start by loading the necessary library support files (if not 
% already loaded):

| ?- logtalk_load(library(hierarchies_loader)).
...


% now you are ready for loading the example:

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


% ask the expert system for help in identifying a bird:

| ?- expert::identify.
Bird identification expert system

bill:sharp_hooked? (yes or no): yes.
eats:birds? (yes or no): yes.
feet:curved_talons? (yes or no): yes.
head:large? (yes or no): yes.

What is the value for tail?
1 : narrow_at_tip
2 : forked
3 : long_rusty
4 : square
5 : other
Enter the number of choice> 1.

wings:long_pointed? (yes or no): yes.

Possible identification : peregrine_falcon

No (more) candidates found.

(16379 ms) yes


% identify another bird:

| ?- expert::identify.
Bird identification expert system

bill:sharp_hooked? (yes or no): no.
bill:flat? (yes or no): no.
bill:short? (yes or no): no.
bill:hooked? (yes or no): yes.

What is the value for flight?
1 : ponderous
2 : powerful
3 : agile
4 : flap_glide
5 : other
Enter the number of choice> 2.

color:dark? (yes or no): yes.
live:at_sea? (yes or no): yes.
nostrils:external_tubular? (yes or no): yes.

What is the value for size?
1 : large
2 : plump
3 : medium
4 : small
Enter the number of choice> 1.

wings:long_narrow? (yes or no): yes.

Possible identification : black_footed_albatross

No (more) candidates found.

(34624 ms) yes
| ?-