#### 8.14.3.7 IfcPropertyReferenceValue

| Merkmal mit Bezugswert

The IfcPropertyReferenceValue allows a property value to be of type of an resource level entity. The applicable entities that can be used as value references are given by the IfcObjectReferenceSelect.

> HISTORY New entity in IFC1.5. Entity has been renamed from IfcObjectReference in IFC2x.

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

XSD Specification:

<xs:element name="IfcPropertyReferenceValue" type="ifc:IfcPropertyReferenceValue" substitutionGroup="ifc:IfcSimpleProperty" nillable="true"/>
<xs:complexType name="IfcPropertyReferenceValue">
<xs:complexContent>
<xs:extension base="ifc:IfcSimpleProperty">
<xs:sequence>
<xs:element name="PropertyReference" nillable="true" minOccurs="0">
<xs:complexType>
<xs:group ref="ifc:IfcObjectReferenceSelect"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcPropertyReferenceValue

| SUBTYPE OF (IfcSimpleProperty);

UsageName | : | OPTIONAL IfcStrippedOptional;
PropertyReference | : | OPTIONAL IfcObjectReferenceSelect;

END_ENTITY;

Attribute Definitions:

UsageName | : | Description of the use of the referenced value within the property. It is a descriptive text that may hold an expression or other additional information.
PropertyReference | : | Reference to another property entity through one of the select types in the IfcObjectReferenceSelect. IFC4 CHANGE The attribute has been made optional with upward compatibility for file based exchange.

Inheritance Graph:

ENTITY IfcPropertyReferenceValue

| ENTITY IfcPropertyAbstraction

| INVERSE

| ENTITY IfcProperty

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

| INVERSE

PartOfPset | : | SET OF IfcPropertySet FOR HasProperties;

| ENTITY IfcSimpleProperty

| ENTITY IfcPropertyReferenceValue

UsageName | : | OPTIONAL IfcStrippedOptional;
PropertyReference | : | OPTIONAL IfcObjectReferenceSelect;

END_ENTITY;

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