[edit] FAIR digital system & Database management system

• the class FAIR digital system (HDO_00002014) is currently placed under OWL thing
• the class Database management system (HDO_00000106) is currently placed under HDO:system

Action:

• create class HDO:digital_system (def. a system whose components are digital) as subclass of HDO:system
• place HDO:database_management_system and HDO:FAIR_digital_system as sub-classes of HDO:digital_system