Cardinality
| Toolbox label | Value | Meaning |
|---|
| Default | (0,1) | Optional, at most one |
| Mandatory | (1,1) | Exactly one |
| MultiOpt | (0,N) | Optional, many |
| Multi | (1,N) | At least one, many |
The default cardinality is (0,1) for attributes and (0,N) for participations. An attribute with maximum N is multivalued.
Generalization type
| Toolbox label | Meaning |
|---|
| Part.Excl. | Partial, exclusive: a parent occurrence belongs to at most one child, or none. |
| Part.Over. | Partial, overlapping: it can belong to several children, or none. |
| Tot.Excl. | Total, exclusive: it belongs to exactly one child. |
| Tot.Over. | Total, overlapping: it belongs to at least one child. |