Hi,
since OJS 3.4 the “unique eight-character suffix” is available for automatic DOI assignment. What happens if I use the same prefix in several OJS instances? Is the uniqueness of the suffix then still guaranteed? Or would I then have to use the (not recommended) custom pattern setting of the DOI?
Best regards
You mean, when the prefix is used for a publisher, but not a journal (e.g. large publishers have the same suffix for their journals)? Probably not. The algorithm is in lib/pkp/classes/doi/DoiGenerator.php - I don’t see anything in there that distinguishes generation by ISSN.
Yes, we use the same prefix for different journals. I guess it’s just extremely unlikely that a DOI will occur twice.
It’s presumably 1/(6^36) = 1 / 10314424798490535546171949056 (6 letters/digits are used, 2 are used for checksum).
And, in any case, if that happened, there is still conflict resolution in the Crossref administration interface.