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This file is part of Logtalk <https://logtalk.org/>  
SPDX-FileCopyrightText: 1998-2023 Paulo Moura <pmoura@logtalk.org>  
SPDX-License-Identifier: Apache-2.0

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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To load this example and for sample queries, please see the `SCRIPT.txt`
file.

This folder contains an implementation of the classical family tree Prolog
example. This solution defines a root category, `relations`, with predicates
for common family relations like `sister/2` and `father/2`. This root category
can then be imported into objects defining the actual families using basic
`female/1`, `male/1`, and `parent/2` facts. The relation predicates always
calls the basic facts in _self_. Any number of family objects can be loaded
at the same time.
