DataCite Metadata Schema v4.4 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:
:unkn

:unas :null

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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