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:- protocol(proto_hierarchyp,
extends(hierarchyp)).
:- info([
version is 1.1,
author is 'Paulo Moura',
date is 2006/2/20,
comment is 'Prototype hierarchy protocol.']).
:- public(parent/1).
:- mode(parent(?object), zero_or_more).
:- info(parent/1, [
comment is 'Returns, by backtracking, all object parents.',
argnames is ['Parent']]).
:- public(parents/1).
:- mode(parents(-list), one).
:- info(parents/1, [
comment is 'List of all object parents.',
argnames is ['Parents']]).
:- public(extension/1).
:- mode(extension(?object), zero_or_more).
:- info(extension/1, [
comment is 'Returns, by backtracking, all object direct descendants.',
argnames is ['Extension']]).
:- public(extensions/1).
:- mode(extensions(-list), one).
:- info(extensions/1, [
comment is 'List of all object direct descendants.',
argnames is ['Extensions']]).
:- end_protocol.
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