我想从推理机 [HermiT] 中获得推断的公理及其正确的解释。我在 protege 中创建了以下本体。
猫头鹰
<?xml version="1.0"?>
<!DOCTYPE rdf:RDF [
<!ENTITY owl "http://www.w3.org/2002/07/owl#" >
<!ENTITY xsd "http://www.w3.org/2001/XMLSchema#" >
<!ENTITY rdfs "http://www.w3.org/2000/01/rdf-schema#" >
<!ENTITY rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#" >
]>
<rdf:RDF xmlns="http://www.semanticweb.org/ontologies/A#"
xml:base="http://www.semanticweb.org/ontologies/A"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:owl="http://www.w3.org/2002/07/owl#"
xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
<owl:Ontology rdf:about="http://www.semanticweb.org/ontologies/A"/>
<!--
///////////////////////////////////////////////////////////////////////////////////////
//
// Classes
//
///////////////////////////////////////////////////////////////////////////////////////
-->
<!-- http://www.semanticweb.org/ontologies/A#A -->
<owl:Class rdf:about="http://www.semanticweb.org/ontologies/A#A">
<rdfs:subClassOf rdf:resource="http://www.semanticweb.org/ontologies/A#B"/>
</owl:Class>
<!-- http://www.semanticweb.org/ontologies/A#B -->
<owl:Class rdf:about="http://www.semanticweb.org/ontologies/A#B">
<owl:equivalentClass rdf:resource="http://www.semanticweb.org/ontologies/A#C"/>
</owl:Class>
<!-- http://www.semanticweb.org/ontologies/A#C -->
<owl:Class rdf:about="http://www.semanticweb.org/ontologies/A#C"/>
</rdf:RDF>
<!-- Generated by the OWL API (version 3.5.1) http://owlapi.sourceforge.net -->
以下是我的Java 代码:-
//Some work done to load ontology
ReasonerFactory factory = new ReasonerFactory();
Reasoner reasoner = new Reasoner(reasonerConf, owlOntology);
BlackBoxExplanation explain = new BlackBoxExplanation(owlOntology, factory, reasoner);
HSTExplanationGenerator multiEx = new HSTExplanationGenerator(explain);
InferredSubClassAxiomGenerator gen = new InferredSubClassAxiomGenerator();
Set<OWLSubClassOfAxiom> subClass = gen.createAxioms(dataFactory, reasoner);
SatisfiabilityConverter converter = new SatisfiabilityConverter(dataFactory);
for (OWLSubClassOfAxiom ax : subClass) {
System.out.println("\nAxiom :- " + ax);
System.out.println("Is axiom entailed by reasoner ? :- " + reasoner.isEntailed(ax));
System.out.println("Is axiom contained in ontology ? :- " + owlOntology.containsAxiom(ax));
Set<Set<OWLAxiom>> expl = multiEx.getExplanations(converter.convert(ax));
System.out.println("No. of Explanations :- " + expl.size());
System.out.println("Explanation :- ");
for (Set<OWLAxiom> a : expl) {
System.out.println(a);
}
}
根据我的代码,这里是输出:-
Axiom :- SubClassOf(<http://www.semanticweb.org/ontologies/A#B> owl:Thing)
Is axiom entailed by reasoner ? :- true
Is axiom contained in ontology ? :- false
No. of Explanations :- 1
Explanation :-
[EquivalentClasses(<http://www.semanticweb.org/ontologies/A#B> <http://www.semanticweb.org/ontologies/A#C> )]
Axiom :- SubClassOf(<http://www.semanticweb.org/ontologies/A#C> owl:Thing)
Is axiom entailed by reasoner ? :- true
Is axiom contained in ontology ? :- false
No. of Explanations :- 1
Explanation :-
[EquivalentClasses(<http://www.semanticweb.org/ontologies/A#B> <http://www.semanticweb.org/ontologies/A#C> )]
Axiom :- SubClassOf(<http://www.semanticweb.org/ontologies/A#A> <http://www.semanticweb.org/ontologies/A#B>)
Is axiom entailed by reasoner ? :- true
Is axiom contained in ontology ? :- true
No. of Explanations :- 1
Explanation :-
[SubClassOf(<http://www.semanticweb.org/ontologies/A#A> <http://www.semanticweb.org/ontologies/A#B>)]
Axiom :- SubClassOf(<http://www.semanticweb.org/ontologies/A#A> <http://www.semanticweb.org/ontologies/A#C>)
Is axiom entailed by reasoner ? :- true
Is axiom contained in ontology ? :- false
No. of Explanations :- 1
Explanation :-
[EquivalentClasses(<http://www.semanticweb.org/ontologies/A#B> <http://www.semanticweb.org/ontologies/A#C> ), SubClassOf(<http://www.semanticweb.org/ontologies/A#A> <http://www.semanticweb.org/ontologies/A#B>)]
我有以下问题:
1) 这段代码是否足以获得推断的公理? (就像我可以检查原始本体中是否有新的公理可用,如果没有那么它是一个推断的公理 - [照顾公理说 C SubClassOf owl:Thing
])
2) 如果 reasoner 的 isEntailed()
方法总是给出 true
,它有什么用?
3) 推论公理总有1种解释。这是对的吗 ?对于推断公理 A SubClassOf C
,有 1 个解释,但它的 Set
与 protege 中显示的相反(按顺序)。所以我需要始终以相反的方向显示它?
Protege 图片 :-
最佳答案
1) 是的,这就足够了 - 本体中包含和存在的公理通常称为“断言”。
2) isEntailed() 并不总是返回 true。它适用于您正在使用的公理 - 尝试询问 owl:Thing 是否是 owl:Nothing 的子类。
3) 对一个蕴涵公理至少有一个解释。当公理包含在本体中时,它是微不足道的解释——所有包含的公理都是蕴含的。对于更复杂的情况,可能有多种解释。
关于java - OWLAPI : Want to get inferred axioms from ontology using HermiT reasoner,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38656552/