symfony/symfony-docs — pull request #2528 by Aitboudad (2013-04-21 02:29:06+00:00)
Title: [reference][constraints] Adding documentation for the Isbn validation.

| Q | A
| ------------- | ---
| Doc fix? | yes
| New docs? | yes (symfony/symfony#6718)
| Applies to | master
| Fixed tickets | #2525