 | Einheit - Zuweisung |
 | Unit Assignment |
 | Assignation d'unité |
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.
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| 1 | Units | IfcUnit | S[1:?] | Units to be included within a unit assignment. | X |
| Rule | Description |
|---|---|
| WR01 | Checks that the set of globally assigned units has each unit type (either of type IfcNamedUnit,IfcDerivedUnit, or IfcMonetaryUnit) defined only once. |
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| IfcUnitAssignment | |||||
| 1 | Units | IfcUnit | S[1:?] | Units to be included within a unit assignment. | X |
<xs:element name="IfcUnitAssignment" type="ifc:IfcUnitAssignment" substitutionGroup="ifc:Entity" nillable="true"/>
<xs:complexType name="IfcUnitAssignment">
<xs:complexContent>
<xs:extension base="ifc:Entity">
<xs:sequence>
<xs:element name="Units">
<xs:complexType>
<xs:group ref="ifc:IfcUnit" maxOccurs="unbounded"/>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcUnit"/>
<xs:attribute ref="ifc:cType" fixed="set"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcUnitAssignment;
Units : SET [1:?] OF IfcUnit;
WHERE
WR01 : IfcCorrectUnitAssignment(Units);
END_ENTITY;
References: IfcContext
EXPRESS-G diagram
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