Hasimir
commented
6 years ago - Changed the help strings referring to the unique identifier to remove references to UUIDs as that may lead to confusion.
- While the identifier must be unique and while UUIDs are often utlised for that purpose due to being easy to generate programmarically, it is not a requirement of the OPF standard that this identifier must be a UUID.
- The OPF standard only specifies that the package element use the unique-identifire attribute to reference the identifier in the metadata element. In turn the metadata element utilises the dc:identifier attribute with the ID matching the previous reference and the unique string of whatever format is specified. Additional information can be supplied in subsequent meta tags.
- Common identifier types used include, but are not limited to: ISBNs, ISSNs, domain name based strings, URL based strings, MD5 hash digests, SHA hash digests, UUIDs and assorted other codes, including arbitrary ones set by the creator (including those hard coded in by creation software).
- See also: http://www.idpf.org/epub/30/spec/epub30-publications.html#sec-opf-metadata-identifiers-uid http://dublincore.org/documents/dcmi-terms/#terms-identifier
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