CODEWITHSUNDEEP
javaprotegeowl-api
Kittani
Kittani

Reputation: 115

Get the list of imported ontologies-- OWL API

I am using OWL API in order to get information from ontologies. I need to retrieve the list of all imported ontologies used in the loaded ontology.

Is there a method in OWL API can do this task?

my code that load an ontology is:

import org.semanticweb.owlapi.apibinding.OWLManager;
import org.semanticweb.owlapi.model.IRI;
import org.semanticweb.owlapi.model.OWLAnnotationProperty;
import org.semanticweb.owlapi.model.OWLClass;
import org.semanticweb.owlapi.model.OWLDataFactory;
import org.semanticweb.owlapi.model.OWLDataProperty;
import org.semanticweb.owlapi.model.OWLImportsDeclaration;
import org.semanticweb.owlapi.model.OWLObjectProperty;
import org.semanticweb.owlapi.model.OWLOntology;
import org.semanticweb.owlapi.model.OWLOntologyCreationException;
import org.semanticweb.owlapi.model.OWLOntologyManager;

public class NSExtractor {

@SuppressWarnings("deprecation")
public static void main(String[] args) throws FileNotFoundException, OWLOntologyCreationException {

    @SuppressWarnings("resource")       
    File testFile= new File("C:\\acco.n3");

    OWLOntologyManager m = OWLManager.createOWLOntologyManager();
    OWLDataFactory f = OWLManager.getOWLDataFactory();
    OWLOntology o; 
    o = m.loadOntologyFromOntologyDocument(testFile);

Upvotes: 2

Views: 445

Answers (2)

Ignazio
Ignazio

Reputation: 10659

o.importsDeclarations() will give you a stream of imports declarations for this ontology. This is the list of IRIs declared with owl:imports properties.

Note: these are the declared imports, not the imports closure - the difference is that the imports closure includes the ontologies imported in your ontology and the ontologies imported by these ontologies - recursively including the imported ontologies.

o.importsClosure() will provide all ontologies that were loaded during parsing of your ontology.

Upvotes: 0

Kittani
Kittani

Reputation: 115

After a lot of searches, I found how to solve this task. I used OWLOntologyXMLNamespaceManager (I am using OWL API 5.1.6). Afterward, using getPrefixes and getNameSpaces you can extract prefix and namespaces, respectively, for the loaded ontology as follow:

OWLDocumentFormat format = m.getOntologyFormat(ontology);

OWLOntologyXMLNamespaceManager nsManager = new OWLOntologyXMLNamespaceManager(ontology, format);

        for (String prefix : nsManager.getPrefixes()) {
            System.out.println(prefix);
        }
        for (String ns : nsManager.getNamespaces()) {
            System.out.println(ns);
        }

Upvotes: 3

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