java-OWLAPI：想要使用HermiT推理程序从本体中推断出公理

我想从推理机[HermiT]推断出公理及其正确的解释.我有以下由protege创建的本体.

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)此代码是否足以获取推断的公理？ (就像我可以检查原始本体中是否有新的公理,如果没有,则可以推断出一个公理-[照顾说C SubClassOf owl：Thing的公理])

2)如果始终给出true,那么推理程序的isEntailed()方法有什么用？

3)对于推断公理总是有1种解释.这是正确的吗 ？对于推论公理C的SubClassOf,有1个解释,但其Set与protege中显示的相反(按顺序).因此,我需要始终以相反的方向显示它吗？

防护图片：-

解决方法:

1)是的,这就足够了-本体中必然存在的公理通常被称为“断言”.

2)isEntailed()并不总是返回true.它适用于您使用的公理-如果owl：Nothing,请尝试询问owl：Thing是否是子类.

3)关于公理,至少有一种解释.当公理包含在本体中时,这是简单的解释-包含的所有公理都是必需的.对于更复杂的情况,可能有多种解释.

标签：protege,ontology,owl-api,java
来源： https://codeday.me/bug/20191118/2027523.html