IFC (IFC4X3_ADD2) official IfcRelVoidsElement

AbRV ⓘ
RV ⓘ 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, the insertion of a void into a wall is represented by the relationship IfcRelVoidsElement. The opening within the wall is defined by the pattern IfcWall - IfcRelVoidsElement - IfcOpeningElement.

relationships for voiding
Figure — Relationship for element voiding Entity inheritance 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.

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IfcRelVoidsElement (2)
5 RelatingBuildingElement IfcElement

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

6 RelatedOpeningElement IfcFeatureElementSubtraction

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

Table 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.

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Table Examples Formal representation

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

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