使用OWL API,给定一个OWLClass,我如何获得它的<rdfs:label>？

Question

使用OWL API 3.4.9.

给定一个OWLClass与本体,我怎么能得到<rdfs:label>的是OWLClass在本体论？

我希望得到的标签类型String.

Answer 1

受到OWL-API指南的启发,以下代码应该可以工作(未经过测试):

//Initialise
OWLOntologyManager m = create();
OWLOntology o = m.loadOntologyFromOntologyDocument(pizza_iri);
OWLDataFactory df = OWLManager.getOWLDataFactory();

//Get your class of interest
OWLClass cls = df.getOWLClass(IRI.create(pizza_iri + "#foo"));

// Get the annotations on the class that use the label property (rdfs:label)
for (OWLAnnotation annotation : cls.getAnnotations(o, df.getRDFSLabel())) {
  if (annotation.getValue() instanceof OWLLiteral) {
    OWLLiteral val = (OWLLiteral) annotation.getValue();
    // look for portuguese labels - can be skipped
      if (val.hasLang("pt")) {
        //Get your String here
        System.out.println(cls + " labelled " + val.getLiteral());
      }
   }
}

Answer 2

该接受的答案是有效的OWLAPI 3.x版本（3.4和3.5版本），而不是OWLAPI 4.x和更新。

要检索rdfs:label针对OWL类声明的值，请尝试以下操作：

OWLClass c = ...; 
OWLOntology o = ...;
IRI cIRI = c.getIRI();
for(OWLAnnotationAssertionAxiom a : ont.getAnnotationAssertionAxioms(cIRI)) {
    if(a.getProperty().isLabel()) {
        if(a.getValue() instanceof OWLLiteral) {
            OWLLiteral val = (OWLLiteral) a.getValue();
            System.out.println(c + " labelled " + val.getLiteral());
        }
    }
}

编辑

正如Ignazio所指出的，也可以使用EntitySearcher，例如：

OWLClass c = ...; 
OWLOntology o = ...;
for(OWLAnnotation a : EntitySearcher.getAnnotations(c, o, factory.getRDFSLabel())) {
    OWLAnnotationValue val = a.getValue();
    if(value instanceof OWLLiteral) {
        System.out.println(c + " labelled " + ((OWLLiteral) value).getLiteral());   
    }
}