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Eugen Hanussek commented on VALIDATOR-482: ------------------------------------------ Hi [~paulspeijers] for me the format is a question of definiton. And according to the current definition it is not a bug. Of course you can require to change the definition. This will be a new feature. regards > ISBN validator validates false for existing book > ------------------------------------------------ > > Key: VALIDATOR-482 > URL: https://issues.apache.org/jira/browse/VALIDATOR-482 > Project: Commons Validator > Issue Type: Bug > Reporter: Paul Speijers > Priority: Major > Attachments: 482.PNG > > > For instance the following ISBN number exists but the validator returns false: > 978-0199828234 > https://www.worldcat.org/search?q=978-0199828234 -- This message was sent by Atlassian Jira (v8.3.4#803005)