Hi I am trying to load schema.org ontology and get all top classes
using ontModel.listHierarchyRootClasses() but can't get the expected
results with different OntModelSpec.
If I use OWL_MEM, it lists 2500+ records with all the records have "null"
URI.
If I use OWL_DL_MEM, it lists 0 records
The code is very simple as follows
Model model = ModelFactory.createDefaultModel();
model.read("https://schema.org/docs/schemaorg.owl";);
OntModel ontModel =
ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM, model);
ExtendedIterator<OntClass> topClazzez = ontModel.listHierarchyRootClasses();
while (topClazzez.hasNext()) {
OntClass clazz = topClazzez.next();
System.out.println(clazz.getURI());
}
A minimal Maven project ready to run to demonstrate my problem is here
https://github.com/AlexTo/jena-lab (have a look at the Main.java)
Thanks a lot
--
Alex To
PhD Candidate
School of Computer Science
Knowledge Discovery and Management Research Group
Faculty of Engineering & IT
THE UNIVERSITY OF SYDNEY | NSW | 2006
Desk 4e69 | Building J12| 1 Cleveland Street
M. +61423330656 <%2B61450061602>
