| Publisher: | Ontopia AS |
|---|---|
| PSI: | http://psi.ontopia.net/ontology/cardinality-0-1 |
| Status: | Stable |
| PSI set: | Ontopoly meta-ontology |
| Type: | Cardinality |
This cardinality states that a field must have zero or one values. It is an error for the field to have more than one value.