我该如何在Java中读取.owl
文件并显示其内容?
这里是使用OWL API库解析OWL本体的示例:
import static org.semanticweb.owlapi.search.Searcher.annotations;
import static org.semanticweb.owlapi.vocab.OWLRDFVocabulary.RDFS_LABEL;
import java.util.ArrayList;
import java.util.List;
import org.semanticweb.owlapi.apibinding.OWLManager;
import org.semanticweb.owlapi.model.IRI;
import org.semanticweb.owlapi.model.OWLAnnotation;
import org.semanticweb.owlapi.model.OWLAnnotationProperty;
import org.semanticweb.owlapi.model.OWLClass;
import org.semanticweb.owlapi.model.OWLDataFactory;
import org.semanticweb.owlapi.model.OWLException;
import org.semanticweb.owlapi.model.OWLLiteral;
import org.semanticweb.owlapi.model.OWLOntology;
import org.semanticweb.owlapi.model.OWLOntologyCreationException;
import org.semanticweb.owlapi.model.OWLOntologyManager;
public class OwlParser {
private final OWLOntology ontology;
private OWLDataFactory df;
public OwlParser(OWLOntology ontology, OWLDataFactory df) {
this.ontology = ontology;
this.df = df;
}
public void parseOntology()
throws OWLOntologyCreationException {
for (OWLClass cls : ontology.getClassesInSignature()) {
String id = cls.getIRI().toString();
String label = get(cls, RDFS_LABEL.toString()).get(0);
System.out.println(label + " [" + id + "]");
}
}
private List<String> get(OWLClass clazz, String property) {
List<String> ret = new ArrayList<>();
final OWLAnnotationProperty owlProperty = df
.getOWLAnnotationProperty(IRI.create(property));
for (OWLOntology o : ontology.getImportsClosure()) {
for (OWLAnnotation annotation : annotations(
o.getAnnotationAssertionAxioms(clazz.getIRI()), owlProperty)) {
if (annotation.getValue() instanceof OWLLiteral) {
OWLLiteral val = (OWLLiteral) annotation.getValue();
ret.add(val.getLiteral());
}
}
}
return ret;
}
public static void main(String[] args) throws OWLException,
InstantiationException, IllegalAccessException,
ClassNotFoundException {
String x = "http://ontology.neuinfo.org/NIF/Dysfunction/NIF-Dysfunction.owl";
IRI documentIRI = IRI.create(x);
OWLOntologyManager manager = OWLManager.createOWLOntologyManager();
OWLOntology ontology = manager
.loadOntologyFromOntologyDocument(documentIRI);
OwlParser parser = new OwlParser(ontology, manager.getOWLDataFactory());
parser.parseOntology();
}
}
您有几个选项。
.owl文件是文本文件,可以这样显示它们。
.owl使用XML,因此您可以像处理XML文档一样处理它。请参阅http://www.w3.org/TR/owl-xmlsyntax/和http://www.w3.org/TR/owl2-overview/以获取标记列表及其表示内容。
或者您可以使用OWL API。您可以在http://owlapi.sourceforge.net/index.html下载它,并在http://owlapi.sourceforge.net/documentation.html中找到多个示例。
显示OWL本体有一定的挑战性,因为您要显示的信息可能高度关联,因此其结构类似于图形而不是顺序或表格。类别可以是许多其他子类的子类,并且循环分类是可能的。也就是说,A可以是B的子类,B可以是C的子类,C可以是A的子类。