String concurrencyMode = (String) properties.get(XOUnitParameter.CONCURRENCY_MODE.getKey());
builder.concurrencyMode(concurrencyMode);
// optional: validation
String validationMode = (String) properties.get(XOUnitParameter.VALIDATION_MODE.getKey());
builder.validationMode(validationMode);
// optional: transaction
String transactionMode = (String) properties.get(XOUnitParameter.TRANSACTION_ATTRIBUTE.getKey());
builder.transactionAttribute(transactionMode);