OK, that makes more sense now. Just different terminology. GregS calls them WUID, the WikiPedia says UUID. I am familiar with the use of a GUID. I didn't know that they were also used in ebooks. This would certainly be another method for those without an ISBN to use.
Hadrien, are you using a UUID for each individual ebook that is generated on your site, or just for each title? If for each individual ebook, why bother?
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