How to read all object properties from Ontology in Java using Jena library?

Question

I want to read all the Object Properties present in the OWL file. I have created that OWL file using Protege tool. I have loaded the model also but I am not able to fetch the object properties.

For Example: if I have a class in Ontology named as Car and which has several Object and Data properties linked to it, such as hasColor, hasAudioSystem,hasGps.

I want to get all the object properties linked with that particular class through Domain and Range or only through the name of the class. Please help..

Can you clarify how the object properties are "linked" to the class? Are they stated as domain/range? Class restrictions? Instance data? — enridaga, May 05 '15 at 11:09

score 1 · Accepted Answer · answered May 05 '15 at 11:24

If you want to get the list of object properties having a type declared as domain or range, one way of doing it with Jena is the following:

public void objectPropertiesForType(Model m, final Resource type) {
    StmtIterator i = m.listStatements(new SimpleSelector() {
        @Override
        public boolean test(Statement s) {
            if (s.getPredicate().equals(RDFS.domain)
                    || s.getPredicate().equals(RDFS.range)) {
                return (s.getObject().equals(type));
            }
            return false;
        }
    });
    while (i.hasNext()) {
        Statement s = i.next();
        System.out.println("Property: " + s.getSubject().getURI());
    }
}

score 0 · Answer 2 · answered May 05 '15 at 11:37

In Jena, you'd probably want to retrieve an instance of OntClass for the class, and then use the listDeclaredProperties method, which will:

Return an iterator over the properties associated with a frame-like view of this class. This captures an intuitive notion of the properties of a class. This can be useful in presenting an ontology class in a user interface, for example by automatically constructing a form to instantiate instances of the class. The properties in the frame-like view of the class are determined by comparing the domain of properties in this class's OntModel with the class itself.

How to read all object properties from Ontology in Java using Jena library?

2 Answers2