IfcPropertyListValue

Definition from IAI: An IfcPropertyListValue defines a property that has several (numeric or descriptive) values assigned, these values are given by an ordered list.

An IfcPropertyListValue is a list of values. The order in which values appear is significant. Each value in the list is unique i.e. no duplicate values are allowed. All list members should be of the same type.

The unit applicable to all values is handled by the Unit attribute:

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.

Example of a property with list value is:

Name	ListValues	Type (through IfcValue)	Unit
ApplicableSizes	1200	IfcPositiveLengthMeasure	-
-	1600	IfcPositiveLengthMeasure	-
-	2400	IfcPositiveLengthMeasure	-

HISTORY: New Entity in Release IFC 2x Edition 2.

EXPRESS specification:

ENTITY IfcPropertyListValue

SUBTYPE OF (

IfcSimpleProperty);

ListValues

LIST [1:?] OF IfcValue;

Unit

OPTIONAL IfcUnit;

WHERE

WR31

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

END_ENTITY;

Attribute definitions:

ListValues	:	List of values.
Unit	:	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.

Formal Propositions:

WR31

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

Inheritance graph

ENTITY IfcPropertyListValue;

ENTITY IfcProperty;

Name

IfcIdentifier;

Description

OPTIONAL IfcText;

INVERSE

PropertyForDependance

SET OF IfcPropertyDependencyRelationship FOR DependingProperty;

PropertyDependsOn

SET OF IfcPropertyDependencyRelationship FOR DependantProperty;

PartOfComplex