If form validation fails; the current transaction should be 'doomed'. Because form validation failure != transaction success. I'm +0

I believe if you asked someone: "If you inserted some temporary data into a RDBMS and then further during form processing a validation failed. What do you believe would happen?"

- It would abort and you would not have to worry about anything.

- It would commit the transaction; you would need to handle form validation in your custom validator.

Every request in zope is transactional. So I believe it does make sense for a developer to feel that during form validation; validation failure would result in transaction.abort().