DataCite Metadata Schema v4.2 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) |
Updated almost 2 years ago