n. ~ PaaST (Item) · A specialization of intellectual entity that does not contain any other intellectual entity.
- PaaST (1.0) 2017 (†860 p. 20): An Item may contain other Items and a Collection may contain other Collections. . . . However, there is an asymmetric relationship in that Items may be contained in a Collection, but an Item cannot contain a Collection. The multiplicities of this aggregation relationship are that, by definition, a Collection contains several Items, but an Item might not be a member of any Collection, but it could belong to one or more Collections. (†2521)