#### 5.4.3.24 IfcRelVoidsElement

| Relation de percement
| Abzug / Subtraktion von Teil aus Element - Relation

IfcRelVoidsElement is an objectified relationship between a building element and one opening element that creates a void in the element. It is a one-to-one relationship. This relationship implies a Boolean operation of subtraction between the geometric bodies of the element and the opening.

As shown in Figure 93, the insertion of a void into a wall is represented by the relationship IfcRelVoidsElement. The opening is created within the wall by IfcWall(StandardCase) o-- IfcRelVoidsElement --o IfcOpeningElement.

Figure 93 — Relationship for element voiding

> HISTORY New entity in IFC1.0

XSD Specification:

<xs:element name="IfcRelVoidsElement" type="ifc:IfcRelVoidsElement" substitutionGroup="ifc:IfcRelDecomposes" nillable="true"/>
<xs:complexType name="IfcRelVoidsElement">
<xs:complexContent>
<xs:extension base="ifc:IfcRelDecomposes">
<xs:sequence>
<xs:element name="RelatingBuildingElement" type="ifc:IfcElement" nillable="true"/>
<xs:element name="RelatedOpeningElement" type="ifc:IfcFeatureElementSubtraction" nillable="true"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcRelVoidsElement

| SUBTYPE OF (IfcRelDecomposes);

RelatingBuildingElement | : | IfcElement;
RelatedOpeningElement | : | IfcFeatureElementSubtraction;

END_ENTITY;

Attribute Definitions:

RelatingBuildingElement | : | Reference to element in which a void is created by associated feature subtraction element. IFC2x CHANGE The data type has been changed from IfcBuildingElement to IfcElement with upward compatibility for file based exchange.
RelatedOpeningElement | : | Reference to the feature subtraction element which defines a void in the associated element. IFC2x CHANGE The data type has been changed from IfcOpeningElement to IfcFeatureElementSubtraction with upward compatibility for file based exchange.

Inheritance Graph:

ENTITY IfcRelVoidsElement

| ENTITY IfcRoot

GlobalId | : | IfcGloballyUniqueId;
OwnerHistory | : | OPTIONAL IfcOwnerHistory;
Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcText;

| ENTITY IfcRelationship

| ENTITY IfcRelDecomposes

| ENTITY IfcRelVoidsElement

RelatingBuildingElement | : | IfcElement;
RelatedOpeningElement | : | IfcFeatureElementSubtraction;

END_ENTITY;

Link to this page