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| Report: | General Info | Attributes | Constraints |
| Attributes | ||||
| Signature | Optionality | Multiplicity | Constant | Documentation |
| 0..1 | -- | The value to assume if this item is not included in data, due to being part of an optional structure. | ||
| 0..1 | 0..* | Set of Reals specifying constraint | ||
| 0..1 | -- | Range of Real specifying constraint | ||
| Constraints | ||
| Name | Expression | |
| consistency | inv: list <> Void xor range <> Void | |