IRI ontId = ind.getIRI();
RegistryItem ront = null;
if (population.containsKey(ontId)) {
// We are not allowing multityping either.
ront = population.get(ontId);
if (!(ront instanceof RegistryOntology)) throw new RegistryContentException(
"Inconsistent multityping: for item " + ontId + " : {" + RegistryOntology.class + ", "
+ ront.getClass() + "}");
} else {
ront = riFactory.createRegistryOntology(ind);
try {