dear all i have an ontology that it doesnt have only one root class. it has 4 seperated classes(4 sub graph) ---1---- with listclasses() method i can't access 3 of them. this method lists one root class and its subclasses!
i want to get all classes of ontology.then i want to get "Thing" class to access all of classes!!! is this possible ???
-----2---- how can i compute distance between 2 classes? Could you give me an advise?
Thanks regards
i use jena and java. how to i load the ontology that define in my local machine and access the classes ? thanks:::
You should go to the openjena.org site, and read all of the relevant documentation. In particular this example seems to do roughly what you are trying to do.
It really depends what your goal is, i.e. what you're writing the program for. If you just want to visualise an ontology represented in a common xml-based language, e.g. RDF, OWL, then Protege would be a nice tool.
"Protégé is a free, open source ontology editor and knowledge-base framework."
U CAN LORD THE ONTOLOGY BY USING URL of the OWL file....
sample code will look like this...
public class ontcreate {
/** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub
string uri = " "; // give base URI of your owl file or path u stored ur OWL file
InputStream in = FileManager.get().open("E:/write/tourism1.owl");
OntModel model = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM,null);
model.read(in,null);
do the things you need
} }