} else {
int colonIndex = s.indexOf(':');
String prefixName = s.substring(0, colonIndex + 1);
String prefix = prefixMap.get(prefixName);
if (prefix == null) {
throw new OWLRuntimeException("Undefined prefix name: "
+ prefixName);
}
String fullIRIString = prefix + s.substring(colonIndex + 1);
iri = IRI.create(fullIRIString);
}