DataCite Metadata Schema v4.1 Standard Values for Unknown Information

The following are a set of standard values that may be used when mandatory property values are not available for various reasons.




temporarily inaccessible


unallowed, suppressed intentionally


not applicable, makes no sense


value unassigned (e.g., Untitled)


value unavailable, possibly unknown


known to be unknown (e.g., Anonymous, Inconnue)


never had a value, never will


explicitly and meaningfully empty


to be assigned or announced later


too numerous to list (et alia)

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