IfcPropertyListValue

BACnet MVD

#### IfcPropertyListValue

Natural language names

| Merkmal mit Listenwert
| Property List Value
| Propriété à liste de valeurs

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcPropertyListValue |  |  |  |
ListValues |  |  | MODIFIED | Instantiation changed to OPTIONAL.
IFC4 Addendum 1
IfcPropertyListValue |  |  |  |
HasConstraints |  |  | ADDED |
HasApprovals |  |  | ADDED |

##### Semantic definitions at the entity

Entity 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 44 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 44 — 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.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---

3

ListValues

IfcValue

? L[1:?]

List of property values.

> IFC4 CHANGE The attribute has been made optional with upward compatibility for file based exchange.

X

X

4 | Unit | 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. |  | X

Formal Propositions

Rule | Description
--- | ---
WR31 | All values within the list of values shall be of the same measure type.

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcPropertyAbstraction

HasExternalReferences

IfcExternalReferenceRelationship
@RelatedResourceObjects

S[0:?]

Reference to an external reference, e.g. library, classification, or document information, that is associated to the property definition.

> IFC4 CHANGE New inverse attribute.

X

IfcProperty
1 | Name | IfcIdentifier |  | Name for this property. This label is the significant name string that defines the semantic meaning for the property. | X | X
2 | Description | IfcText | ? | Informative text to explain the property. | X | X

PartOfPset

IfcPropertySet
@HasProperties

S[0:?]

Reference to the IfcPropertySet by which the IfcProperty is referenced.

> IFC4 CHANGE New inverse attribute to navigate from IfcProperty to IfcPropertySet with upward compatibility for file based exchange.

X

| PropertyForDependance | IfcPropertyDependencyRelationship @DependingProperty | S[0:?] | The property on whose value that of another property depends. |  | X
| PropertyDependsOn | IfcPropertyDependencyRelationship @DependantProperty | S[0:?] | The relating property on which the value of the property depends. |  | X

PartOfComplex

IfcComplexProperty
@HasProperties

S[0:?]

Reference to the IfcComplexProperty in which the IfcProperty is contained.

> IFC4 CHANGE The cardinality has changed to 0..n to allow reuse of instances of IfcProperty in several IfcComplexProperty with upward compatibility for file based exchange.

X

| HasConstraints | IfcResourceConstraintRelationship @RelatedResourceObjects | ? S[0:?] | User-defined constraints for the property. |  | X
| HasApprovals | IfcResourceApprovalRelationship @RelatedResourceObjects | ? S[0:?] | User-defined approvals for the property. |  | X
IfcSimpleProperty
IfcPropertyListValue

3

ListValues

IfcValue

? L[1:?]

List of property values.

> IFC4 CHANGE The attribute has been made optional with upward compatibility for file based exchange.

X

X

4 | Unit | 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. |  | X

##### Formal representations

XML 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:sequence>
<xs:element name="ListValues" nillable="true" minOccurs="0">
<xs:complexType>
<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:complexType>
</xs:element>
<xs:element name="Unit" nillable="true" minOccurs="0">
<xs:complexType>
<xs:group ref="ifc:IfcUnit"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`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;

EXPRESS-G diagram

`

Link to this page