// check property converter
PropertyConverter converter = key.databaseConverter(securityContext, this);
if (converter != null) {
try {
return converter.convertForSorting(propertyValue);
} catch(FrameworkException fex) {
logger.log(Level.WARNING, "Unable to convert property {0} of type {1}: {2}", new Object[] {
key.dbName(),
getClass().getSimpleName(),