What kinds of persistent identifiers for publications are there?

Question

In addition to the well-known DOI, what other persistent identifiers (PIDs) for publications/documents are in use?

Answer 1

Possible answers to this depend quite a bit on how you define publications, and how specific you want the identifiers to be in terms of fitting the respective definition. Wikidata has several perspectives on that - currently, there are

• around 700 different types of publications
• over 400 properties for authority control for works, not even including DOIs (which can refer to events and many other things that are not publications)
• just 13 properties for items about scholarly articles, again not including DOIs
• many identifiers in this list of bibliographic properties

None of these are exhaustive, and consistency (e.g. in terms of including DOIs or not) can probably also be improved further.