try{
Object [] o = ontology.convertGetValues(
reasoner.getIndividualsBelongingToClass((OWLClass)ontology.convertSetValue(cls)));
return (o.length > 0)?(IInstance [])o:new IInstance[0];
}catch(ProtegeReasonerException ex){
throw new IOntologyError("Reasoner Problem",ex);
}
//return new IInstance[0];
}