@Override
public void handleChild(AbstractOWLDataRangeHandler handler) throws OWLXMLParserException {
OWLDataRange handledDataRange = handler.getOWLObject();
if (handledDataRange.isDatatype() && datatype == null) {
datatype = handledDataRange.asOWLDatatype();
}
else {
dataRange = handledDataRange;
}
}