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 A, 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.
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 |
An 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 |
An optional description, provided to exchange informative comments. |
| Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes | |||
| 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. |
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 also provide a name and description for the concept. |
|
| Click to show 2 hidden inherited concepts Click to hide 2 inherited concepts | |||
5.4.3.62.5 Formal representation
ENTITY IfcRelVoidsElement
SUBTYPE OF (IfcRelDecomposes);
RelatingBuildingElement : IfcElement;
RelatedOpeningElement : IfcFeatureElementSubtraction;
END_ENTITY;
