olemus
olemit otseselt identifitseeriv atribuut
= an attribute that explicitly identifies an entity

näiteid
nimi, aadress, isikukood
= name, address, Social Security number

https://www.bileta.org.uk/wp-content/uploads/Data-protection-and-database-theory-Applying-database-design-principles-to-personal-data-identification.pdf (Section 4)

vt ka
- identifikaator
- isikuandmed
- isikutuvastusteave