Thread: Project Gutenberg going Mobi?
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Old 03-27-2009, 01:58 PM   #22
kovidgoyal
creator of calibre
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Quote:
Originally Posted by Hadrien View Post
For example for the following book uploaded by mtravellerh: https://www.mobileread.com/forums/showthread.php?t=43041

This is NOT a unique identifier and while it maybe be ok for files that you convert for yourself, it is pretty catastrophic to distribute files with such an identifier. You might have a lot of books uploaded here on Mobileread all sharing the same identifier because of this problem.
My advice would be to assign a UUID or another unique identifier to every book available in the ePub section to fix this problem.
1. Why is it catastrophic to distribute EPUB books with the same id?
2. If you specify an ISBN in the metadata, calibre will put that in the EPUB file. Having and additional calibre specific identifier is no problem at all.
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