🏠APIprotogoogleprotobufFeatureSetEnumsFieldPresenceOn this pageEnumeration: FieldPresenceprotobuf.FeatureSet.FieldPresence FieldPresence enum. Enumeration Members EXPLICIT • EXPLICIT = 1 FIELD_PRESENCE_UNKNOWN • FIELD_PRESENCE_UNKNOWN = 0 IMPLICIT • IMPLICIT = 2 LEGACY_REQUIRED • LEGACY_REQUIRED = 3