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.

Code

Definition

(:unac)

temporarily inaccessible

(:unal)

unallowed, suppressed intentionally

(:unap)

not applicable, makes no sense

(:unas)

value unassigned (e.g., Untitled)

(:unav)

value unavailable, possibly unknown

(:unkn)

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

(:none)

never had a value, never will

(:null)

explicitly and meaningfully empty

(:tba)

to be assigned or announced later

(:etal)

too numerous to list (et alia)


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