8.11.3.11 IfcUnitAssignment
RV ⓘ
AbV ⓘ
8.11.3.11.1 Semantic definition
IfcUnitAssignment indicates a set of units which may be assigned. Within an IfcUnitAssignment each unit definition shall be unique; that is, there shall be no redundant unit definitions for the same unit type such as length unit or area unit. For currencies, there shall be only a single IfcMonetaryUnit within an IfcUnitAssignment.
A IfcProject has a unit assignment which establishes a set of units which will be used globally within the project, if not otherwise defined. Other objects may have local unit assignments if there is a requirement for them to make use of units which do not fall within the project unit assignment. New entity in IFC1.5.1.8.11.3.11.2 Entity inheritance
8.11.3.11.3 Attributes
| # | Attribute | Type | Description |
|---|---|---|---|
| IfcUnitAssignment (1) | |||
| 1 | Units | SET [1:?] OF IfcUnit |
Units to be included within a unit assignment. |
8.11.3.11.4 Formal propositions
| Name | Description |
|---|---|
| WR01 |
Checks that the set of globally assigned units has each unit type (either of type IfcNamedUnit,IfcDerivedUnit, or IfcMonetaryUnit) defined only once. |
|
|
8.11.3.11.5 Formal representation
ENTITY IfcUnitAssignment;
Units : SET [1:?] OF IfcUnit;
WHERE
WR01 : IfcCorrectUnitAssignment(Units);
END_ENTITY;