IfcUnitAssignment indicates a set of units which may be assigned. Within an IfcUnitAssigment 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.
NOTE 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.
HISTORY New entity in IFC1.5.1.
|1||Units||SET [1:?] OF IfcUnit||Units to be included within a unit assignment.|
ENTITY IfcUnitAssignment; Units : SET [1:?] OF IfcUnit; WHERE WR01 : IfcCorrectUnitAssignment(Units); END_ENTITY;