The field/metadata "Importance" contains some classification values (Personal data, Confidential, ...) and importance values (Normal, High, ...) all mixed. The need of a new field "Classification" seems to be important to separate both meaning (Importance and Classification/Dissemination). Here are the proposed values :
Diffusion Value Rules Civilian Not Classified (default) C1 - Internal Use B C2 - Restricted Distribution C3 – Secret / Confidential A Military (FR) Restricted Distribution Secret-Defense A Top Secret-Defense A
The NATO and TLP (CISA - Cybersecurity & Infrastructure Security Agency) classifications will be added to these lists if necessary.