olemus
olem muude olemite linkimiseks
= an entity used to link other entities

ülevaateid
https://stackoverflow.com/questions/28905166/difference-between-associative-entity-and-associative-relationship-attribute

https://docs.infor.com/ln/10.5.1/fr-fr/lnolh/help/tg/onlinemanual/em000860.html