#### 8.14.3.6 IfcPropertyListValue

| Propriété à liste de valeurs
| Merkmal mit Listenwert

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 185 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.

> NOTE An IfcPropertyListValue may be exchanged with no values assigned yet. In this case the ListValues are set to NIL.

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

> Table 185 — List property with values, measure types and units

> HISTORY New entity in IFC2x2.

> IFC4 CHANGE Attribute ListValues has been made OPTIONAL with upward compatibility for file based exchange.

XSD Specification:

<xs:element name="IfcPropertyListValue" type="ifc:IfcPropertyListValue" substitutionGroup="ifc:IfcSimpleProperty" nillable="true"/>
<xs:complexType name="IfcPropertyListValue">
<xs:complexContent>
<xs:extension base="ifc:IfcSimpleProperty"/>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcPropertyListValue

| SUBTYPE OF (IfcSimpleProperty);

ListValues | : | OPTIONAL LIST [1:?] OF IfcStrippedOptional;
Unit | : | OPTIONAL IfcStrippedOptional;

| WHERE

WR31 | : | SIZEOF(QUERY(temp <* SELF.ListValues | NOT(TYPEOF(SELF.ListValues[1]) = TYPEOF(temp)) )) = 0;

END_ENTITY;

Attribute Definitions:

ListValues | : | List of property values. IFC4 CHANGE The attribute has been made optional with upward compatibility for file based exchange.
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 IfcPropertyAbstraction

| INVERSE

| ENTITY IfcProperty

Name | : | IfcIdentifier;
Description | : | OPTIONAL IfcStrippedOptional;

| INVERSE

PartOfPset | : | SET OF IfcPropertySet FOR HasProperties;

| ENTITY IfcSimpleProperty

| ENTITY IfcPropertyListValue

ListValues | : | OPTIONAL LIST [1:?] OF IfcStrippedOptional;
Unit | : | OPTIONAL IfcStrippedOptional;

END_ENTITY;

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