IFC 4.3.0.1 (IFC4X3) development

8.16.3.10 IfcPropertyListValue

8.16.3.10.1 Semantic definition

An IfcPropertyListValue defines a property that has several (numeric or descriptive) values assigned, these values are given by an ordered list. It defines a property - list value combination for which the property Name, an optional Description, the optional ListValues with measure type and optionally an Unit is given. An IfcPropertyListValue is a list of values. The order in which values appear is significant. All list members shall be of the same type.

The unit is handled by the Unit attribute, see Table 8.16.3.10.A for an example of a list property:

  • 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 ListValues Type(through IfcValue) Unit
ApplicableSizes 1200 IfcPositiveLengthMeasure -
- 1600 IfcPositiveLengthMeasure -
- 2400 IfcPositiveLengthMeasure -
Table 8.16.3.10.A — List property with values, measure types and units

8.16.3.10.2 Entity inheritance

8.16.3.10.3 Attributes

# Attribute Type Description
IfcPropertyAbstraction (1)
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.

IfcProperty (8)
1 Name IfcIdentifier

Name for this property. This label is the significant name string that defines the semantic meaning for the property.

2 Specification OPTIONAL IfcText

URI reference to a location with semantic definition or informative text to explain the property.

PartOfPset SET [0:?] OF IfcPropertySet FOR HasProperties

Reference to the IfcPropertySet by which the IfcProperty is referenced.

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

Reference to the IfcComplexProperty in which the IfcProperty is contained.

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.

Click to show 9 hidden inherited attributes Click to hide 9 inherited attributes
IfcPropertyListValue (2)
3 ListValues OPTIONAL LIST [1:?] OF IfcValue

List of property values.

4 Unit OPTIONAL IfcUnit

Unit for the list values, 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.

Table 8.16.3.10.B

8.16.3.10.4 Formal propositions

Name Description
WR31

All values within the list of values shall be of the same measure type.

SIZEOF(QUERY(temp <* SELF.ListValues | 
  NOT(TYPEOF(SELF.ListValues[1]) = TYPEOF(temp))
  )) = 0
Table 8.16.3.10.C

8.16.3.10.5 Formal representation

ENTITY IfcPropertyListValue
 SUBTYPE OF (IfcSimpleProperty);
	ListValues : OPTIONAL LIST [1:?] OF IfcValue;
	Unit : OPTIONAL IfcUnit;
 WHERE
	WR31 : SIZEOF(QUERY(temp <* SELF.ListValues | 
  NOT(TYPEOF(SELF.ListValues[1]) = TYPEOF(temp))
  )) = 0;
END_ENTITY;

8.16.3.10.6 References

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8.16.3.10.7 Changelog

  • attribute ListValues optional, Is now optional