how to get SOURCE

Question

i do some development with jena ontology API.my ontology file in my local machine..when i'm going to read the model.. there is an error.. and i made ontology with protege and tried to read that file.

String SOURCE = "http://www.owl-ontologies.com/Ontology1275995702";(it's XML:base value)
        //String NS = SOURCE + "#";
        //InputStream in = FileManager.get().open("tourism.owl");
        OntModel model = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM);
        model.read(SOURCE,"RDF/XML");

        OntClass paper = model.getOntClass( SOURCE + "srilanka" );

how can i fix this?

Answer 1

I'm not sure exactly what you are trying to do here. It seems that the string is not formatted correctly first off.

But what type or error are you having. Could you post the error text.

If you reformat it it will look something like:

String SOURCE = "http://www.owl-ontologies.com/Ontology1275995702";

//This line will cause an error (is it actually part of the code?)
(it's XML:base value)

//String NS = SOURCE + "#";
//InputStream in = FileManager.get().open("tourism.owl");
OntModel model = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM);
model.read(SOURCE,"RDF/XML");

OntClass paper = model.getOntClass( SOURCE + "srilanka" );

Answer 2

What is this owl-ontologies.com URL? Is this just some URL you made up when you created the ontology in Protégé? And then you try reading the ontology from that URL? How should that work if you haven't published the ontology to the web?

Try this:

InputStream in = FileManager.get().open("tourism.owl");
OntModel model = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM);
model.read(in, "RDF/XML");

Iterator<OntClass> it = model.listClasses();
while (it.hasNext()) {
  OntClass class = it.next();
  System.out.println(class.getLabel(null));
}