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 691 for an example of a list property:

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)
ApplicableSizes 1200 IfcPositiveLengthMeasure -
- 1600 IfcPositiveLengthMeasure -
- 2400 IfcPositiveLengthMeasure -

Table 691 — 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:extension base="ifc:IfcSimpleProperty">
     <xs:element name="ListValues" nillable="true" minOccurs="0">
       <xs:group ref="ifc:IfcValue" maxOccurs="unbounded"/>
       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcValue"/>
       <xs:attribute ref="ifc:cType" fixed="list"/>
       <xs:attribute ref="ifc:arraySize" use="optional"/>
     <xs:element name="Unit" nillable="true" minOccurs="0">
       <xs:group ref="ifc:IfcUnit"/>

EXPRESS Specification:

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

Link to EXPRESS-G diagram EXPRESS-G diagram

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
HasExternalReferences : SET OF IfcExternalReferenceRelationship FOR RelatedResourceObjects;
ENTITY IfcProperty
Name : IfcIdentifier;
Description : OPTIONAL IfcText;
PartOfPset : SET OF IfcPropertySet FOR HasProperties;
PropertyForDependance : SET OF IfcPropertyDependencyRelationship FOR DependingProperty;
PropertyDependsOn : SET OF IfcPropertyDependencyRelationship FOR DependantProperty;
PartOfComplex : SET OF IfcComplexProperty FOR HasProperties;
ENTITY IfcSimpleProperty
ENTITY IfcPropertyListValue
ListValues : OPTIONAL LIST [1:?] OF IfcValue;
Unit : OPTIONAL IfcUnit;

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