public static TripleCollection owlOntologyToClerezzaMGraph(OWLOntology ontology) {
MGraph mGraph = null;
ByteArrayOutputStream out = new ByteArrayOutputStream();
OWLOntologyManager manager = ontology.getOWLOntologyManager();
try {
manager.saveOntology(ontology, new RDFXMLOntologyFormat(), out);
ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
ParsingProvider parser = new JenaParserProvider();
mGraph = new SimpleMGraph();
parser.parse(mGraph, in, SupportedFormat.RDF_XML, null);
} catch (OWLOntologyStorageException e) {