International Standards Organization (ISO) have changed the ISBN-standard from 10 to 13 digits.
All existing ISBN-10 numbers should get converted to ISBN-13 format. ISBN-10 is deprecated from January 2007.
ISBN-13 support was made in eZ publish 3.9, but with some issues. To have complete support for ISBN-13 I believe these things should be done:
- ISBN-13 should be enabled in the datatype by default on new eZ publish installations.
- If a user enters an ISBN-10 number in content-attribute that is ISBN-13-enabled, it should be converted to ISBN-13 by the datatype, and stored as ISBN-13 in the db (when ISBN-13 enabled in datatype).
- Datatype should always generate hyphens '-' at the right places. If the hyphens are stored or not in db is not so important. But it's important that the user can write ISBN-13 with or without hypens, and that the view-templates show ISBN with hyphens at correct places. Now the datatype allows hyphens anywhere, and stores, and view just as user wrote it.
- Create a script to convert ISBN-10 data to ISBN-13.
Resources for helping development: