IFC 4.3.1.0 (IFC4X3_ADD1)

5.4.3.62 IfcRelVoidsElement

5.4.3.62.1 Semantic definition

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 5.4.3.62.A, the insertion of a void into a wall is represented by the relationship IfcRelVoidsElement. The opening is created within the wall by IfcWall o-- IfcRelVoidsElement --o IfcOpeningElement.

relationships for voiding
Figure 5.4.3.62.A — Relationship for element voiding

5.4.3.62.2 Entity inheritance

5.4.3.62.3 Attributes

# Attribute Type Description
IfcRoot (4)
1 GlobalId IfcGloballyUniqueId

Assignment of a globally unique identifier within the entire software world.

2 OwnerHistory OPTIONAL IfcOwnerHistory

Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object,

3 Name OPTIONAL IfcLabel

Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule.

4 Description OPTIONAL IfcText

Optional description, provided for exchanging informative comments.

Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes
IfcRelVoidsElement (2)
5 RelatingBuildingElement IfcElement

Reference to element in which a void is created by associated feature subtraction element.

6 RelatedOpeningElement IfcFeatureElementSubtraction

Reference to the feature subtraction element which defines a void in the associated element.

Table 5.4.3.62.B

5.4.3.62.4 Concept usage

Concept Usage Description
IfcRoot (2)
Revision Control General

Ownership, history, and merge state is captured using IfcOwnerHistory.

Software Identity General

IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.

Click to show 2 hidden inherited concepts Click to hide 2 inherited concepts
Table 5.4.3.62.C

5.4.3.62.5 Formal representation

ENTITY IfcRelVoidsElement
 SUBTYPE OF (IfcRelDecomposes);
	RelatingBuildingElement : IfcElement;
	RelatedOpeningElement : IfcFeatureElementSubtraction;
END_ENTITY;

5.4.3.62.6 References

5.4.3.62.7 Changelog

5.4.3.62.7.1 IFC4