DataCite Metadata Schema v4.3 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.

Examples of usage:

:unas :null




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)

Did this page help you?