// create custom prefix
model.getNamespaceManager().setPrefix(o.getNameSpace(),PUtils.createOntologyPrefix(o.getURI()));
// import ontologies
importHelper.addImport(o.getURI());
importHelper.importOntologies();
// don't know what is the function of this???
//model.getNamespaceManager().setPrefix(ProtegeNames.NS, ProtegeNames.PROTEGE_PREFIX);
if(imported == null)