The property with a single value IfcPropertySingleValue defines a property object which has a single (numeric or descriptive) value assigned. It defines a property - single value combination for which the property Name, an optional Description, and an optional NominalValue with measure type is provided. In addition, the default unit as specified within the project unit context can be overridden by assigning an Unit.
The unit is handled by the Unit attribute, see Table 220.127.116.11.C for an example of various single value properties:
- If the Unit attribute is not given, then the unit is already implied by the type of IfcMeasureValue or IfcDerivedMeasureValue. The associated unit can be found at the IfcUnitAssignment globally defined at the project level (IfcProject.UnitsInContext).
- If the Unit attribute is given, then the unit assigned by the Unit attribute overrides the globally assigned unit.
|Name||NominalValue||Type (through IfcValue)||Unit|
|Description||Manufacturer "A" door||IfcLabel||-|
|HasExternalReferences||SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects||
Reference to an external reference, e.g. library, classification, or document information, that is associated to the property definition.
Name for this property. This label is the significant name string that defines the semantic meaning for the property.
URI reference to a location with semantic definition or informative text to explain the property.
|PartOfPset||SET [0:?] OF IfcPropertySet FOR HasProperties|
|PropertyForDependance||SET [0:?] OF IfcPropertyDependencyRelationship FOR DependingProperty||
The property on whose value that of another property depends.
|PropertyDependsOn||SET [0:?] OF IfcPropertyDependencyRelationship FOR DependantProperty||
The relating property on which the value of the property depends.
|PartOfComplex||SET [0:?] OF IfcComplexProperty FOR HasProperties|
|HasConstraints||SET [0:?] OF IfcResourceConstraintRelationship FOR RelatedResourceObjects||
User-defined constraints for the property.
|HasApprovals||SET [0:?] OF IfcResourceApprovalRelationship FOR RelatedResourceObjects||
User-defined approvals for the property.
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Value and measure type of this property.
Unit for the nominal value, if not given, the default value for the measure type (given by the TYPE of nominal value) is used as defined by the global unit assignment at IfcProject.
ENTITY IfcPropertySingleValue SUBTYPE OF (IfcSimpleProperty); NominalValue : OPTIONAL IfcValue; Unit : OPTIONAL IfcUnit; END_ENTITY;