throw new IllegalArgumentException("No ontology with public key " + reference + " found.");
case UNCHARTED:
log.warn("No key found for IRI {}", reference);
return null;
case ORPHAN:
throw new OrphanOntologyKeyException(reference);
default:
String key = /* getKey(reference); */
keymap.getMapping(reference).getUnicodeString();
return getStoredOntology(key, returnType, merge);
}