解析猫头鹰文件

Question

Thanks for the previous posts. That helped a lot in parsing the owl file. Please look at the following code.

        OWLOntologyManager manager = OWLManager.createOWLOntologyManager();

        OWLDataFactory factory = manager.getOWLDataFactory();

        File file = new File("sample.owl");

        OWLOntology localOntology = manager.loadOntologyFromOntologyDocument(file);
        System.out.println("Loaded ontology: " + localOntology);

        IRI documentIRI = manager.getOntologyDocumentIRI(localOntology);
        System.out.println("    from: " + documentIRI);


        OWLClass clsAMethodA = factory.getOWLClass(documentIRI);

The examples stated in the documentation of owl uses IRI that right now doesnot exists. I am not understanding how do i extract all classes of the owl file. Where should i save the classes. How do i go about in saving those classes?? Any help?

Answer 1

You need to import the OWL API and then follow a code like mine. I am getting all the logical axioms. From axioms, you can extract other modelling elements such as classes and individuals.

  OWLOntologyManager manager = OWLManager.createOWLOntologyManager(); OWLOntology localOntology=null; File file=new File("ontology/pizza.owl"); if (file == null) return; //loading the ontology try { localOntology = manager.loadOntologyFromOntologyDocument(file); } catch (OWLOntologyCreationException e) { e.printStackTrace(); } //get logical axioms Set<OWLLogicalAxiom> ax = localOntology.getLogicalAxioms(); 

Answer 2

import com.hp.hpl.jena.ontology.OntClass;
import com.hp.hpl.jena.ontology.OntModel;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.util.FileManager;
import com.hp.hpl.jena.util.iterator.ExtendedIterator;
import java.io.InputStream;
import java.util.Iterator;
import java.util.List;

public class IteratingRDFM {

static final String inputFileName = "D:\\SBIRS.owl";

public static void main(String args[]) {

    try {

        //create the reasoning model using the base
        OntModel inf = ModelFactory.createOntologyModel();
        // use the FileManager to find the input file
        InputStream in = FileManager.get().open(inputFileName);
        if (in == null) {
            throw new IllegalArgumentException("File: " + inputFileName + " not found);
        }
        inf.read(in, "");

        String URI = "http://www.semanticweb.org/ontologies/2012/0/SBIRS.owl";

        ExtendedIterator classes = inf.listClasses();
        while (classes.hasNext()) {
            OntClass obj = (OntClass) classes.next();

            String className = obj.getLocalName().toString();
            if (obj.hasSubClass()) {
                for (Iterator i = obj.listSubClasses(true); i.hasNext();) {
                    OntClass c = (OntClass) i.next();
                    System.out.print(c.getLocalName().toString() +""+className);     
                }

            }
        }


    } catch (Exception e) {
        System.out.println(e.getMessage());
    }
   }
}