Posted on by & filed under bookworm, epub.

Here’s some trivia about the use of the required dc:identifier metadata element in ePubs that have been uploaded to Bookworm to date.

dc:identifier type Percentage of total
None 0.5%
UUID 81%
ISBN 2.3%
URL 1%
Unknown format 15.2%

Although the ePub specification does not describe a particular identifier format, it is strongly recommended that ePub creators use one of ISBN, UUID or URL.

Note: only UUIDs and ISBNs that begin with urn:uuid or urn:isbn are counted here. Assigning either number without the prefix results in them being filed as “unknown.”


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