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This file is part of Logtalk <https://logtalk.org/>  
Copyright 1998-2018 Paulo Moura <pmoura@logtalk.org>

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
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% start by loading the example and the required library files:

| ?- 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
| ?- 
