Natural language names
 | Bezug |
 | Reference |
 | Référence |
| Bezug |
| Reference |
| Référence |
| Item | SPF | XML | Change | Description | IFC2x3 to IFC4 |
|---|---|---|---|---|
| IfcReference | ADDED | IFC4 to IFC4 ADD1 | ||
| IfcReference | ||||
| ListPositions | MODIFIED | Type changed from INTEGER to IfcInteger. |
This entity is used to refer to a value of an attribute on an instance. It may refer to the value of a scalar attribute or a value within a collection-based attribute. Referenced attributes may be direct values, object references, collections, inverse object references, and inverse collections. References may be chained to form a path of object-attribute references.
| # | Attribute | Type | Cardinality | Description | B |
|---|---|---|---|---|---|
| 1 | TypeIdentifier | IfcIdentifier | [0:1] |
Optional identifier of the entity or type such as 'IfcMaterialLayerSet'. For entity, type, or select-based references within a collection, this resolves the reference to such type.
If omitted, the type is assumed to be the same as the declared referencing attribute.
EXAMPLE IfcRelAssociatesMaterial.RelatingMaterial may be resolved to IfcMaterialLayerSet. | X |
| 2 | AttributeIdentifier | IfcIdentifier | [0:1] | Optionally identifies a direct or inverse attribute within an entity such as 'MaterialLayers'. If TypeIdentifier is specified and refers to an entity, the attribute must exist within the referenced entity. A null value indicates a reference to the type or entity itself, such as for indicating that the type of a value must match a specified constraint. | X |
| 3 | InstanceName | - | This attribute is out of scope for this model view definition and shall not be set. | ||
| 4 | ListPositions | - | This attribute is out of scope for this model view definition and shall not be set. | ||
| 5 | InnerReference | IfcReference | [0:1] |
Optional reference to an inner value for ENTITY, SELECT, SET, or LIST attributes.
A path may be formed by linking IfcReference instances together.
EXAMPLE A material layer thickness may be referenced using several instances: #1=IFCREFERENCE($,'IfcSlab','HasAssociations',#2); #2=IFCREFERENCE($,'IfcMaterialLayerSet','MaterialLayers',#3); #3=IFCREFERENCE('Core','IfcMaterialLayer','LayerThickness',$); | X |
| # | Attribute | Type | Cardinality | Description | B |
|---|---|---|---|---|---|
| IfcReference | |||||
| 1 | TypeIdentifier | IfcIdentifier | [0:1] |
Optional identifier of the entity or type such as 'IfcMaterialLayerSet'. For entity, type, or select-based references within a collection, this resolves the reference to such type.
If omitted, the type is assumed to be the same as the declared referencing attribute.
EXAMPLE IfcRelAssociatesMaterial.RelatingMaterial may be resolved to IfcMaterialLayerSet. | X |
| 2 | AttributeIdentifier | IfcIdentifier | [0:1] | Optionally identifies a direct or inverse attribute within an entity such as 'MaterialLayers'. If TypeIdentifier is specified and refers to an entity, the attribute must exist within the referenced entity. A null value indicates a reference to the type or entity itself, such as for indicating that the type of a value must match a specified constraint. | X |
| 3 | InstanceName | - | This attribute is out of scope for this model view definition and shall not be set. | ||
| 4 | ListPositions | - | This attribute is out of scope for this model view definition and shall not be set. | ||
| 5 | InnerReference | IfcReference | [0:1] |
Optional reference to an inner value for ENTITY, SELECT, SET, or LIST attributes.
A path may be formed by linking IfcReference instances together.
EXAMPLE A material layer thickness may be referenced using several instances: #1=IFCREFERENCE($,'IfcSlab','HasAssociations',#2); #2=IFCREFERENCE($,'IfcMaterialLayerSet','MaterialLayers',#3); #3=IFCREFERENCE('Core','IfcMaterialLayer','LayerThickness',$); | X |
<xs:element name="IfcReference" type="ifc:IfcReference" substitutionGroup="ifc:Entity" nillable="true"/>
<xs:complexType name="IfcReference">
<xs:complexContent>
<xs:extension base="ifc:Entity">
<xs:sequence>
<xs:element name="InnerReference" type="ifc:IfcReference" nillable="true" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="TypeIdentifier" type="ifc:IfcIdentifier" use="optional"/>
<xs:attribute name="AttributeIdentifier" type="ifc:IfcIdentifier" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcReference;
TypeIdentifier : OPTIONAL IfcIdentifier;
AttributeIdentifier : OPTIONAL IfcIdentifier;
InstanceName : OPTIONAL IfcStrippedOptional;
ListPositions : OPTIONAL LIST [1:?] OF IfcStrippedOptional;
InnerReference : OPTIONAL IfcReference;
END_ENTITY;
EXPRESS-G diagram
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