| Publisher: | Ontopia AS |
|---|---|
| PSI: | http://psi.ontopia.net/ontology/cardinality |
| Status: | Stable |
| PSI set: | Ontopoly meta-ontology |
| Type: | Topic type |
Topics of this type are used to indicate the cardinality of a field as attached to a particular topic type. This topic type is also used as a role type in some association types.
The following cardinalities are possible:
| INSTANCE |
|---|
| Exactly one |
| Zero or one |
| Zero or more |
| One or more |