IfcRelVoidsElement

Semantic definitions at the entity

Entity definition

Objectified relationship between an ~~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.

Figure 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.

HISTORY New entity in IFC Release 1.0

Attribute definitions

#	Attribute	Type	Cardinality	Description	A
5	RelatingBuildingElement	IfcElement	[1:1]	Reference to ~~building~~ element in which a void is created by associated ~~opening~~ feature subtraction element.	X
6	RelatedOpeningElement	IfcFeatureElementSubtraction	[1:1]	Reference to the ~~opening~~ feature subtraction element which defines a void in the associated ~~opening~~ element.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	A
IfcRoot
1	GlobalId	IfcGloballyUniqueId	[1:1]	Assignment of a globally unique identifier within the entire software world.	X
2	OwnerHistory	IfcOwnerHistory	[1:1]	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, NOTE: only the last modification in stored.	X
3	Name	IfcLabel	[0:1]	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.	X
4	Description	IfcText	[0:1]	Optional description, provided for exchanging informative comments.	X
IfcRelationship
IfcRelConnects
IfcRelVoidsElement
5	RelatingBuildingElement	IfcElement	[1:1]	Reference to ~~building~~ element in which a void is created by associated ~~opening~~ feature subtraction element.	X
6	RelatedOpeningElement	IfcFeatureElementSubtraction	[1:1]	Reference to the ~~opening~~ feature subtraction element which defines a void in the associated ~~opening~~ element.	X

Formal representations

XSD Specification

 <xs:element name="IfcRelVoidsElement" type="ifc:IfcRelVoidsElement" substitutionGroup="ifc:IfcRelConnects" nillable="true"/>

 <xs:complexType name="IfcRelVoidsElement">

  <xs:complexContent>

   <xs:extension base="ifc:IfcRelConnects">

    <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 (IfcRelConnects);

  RelatingBuildingElement : IfcElement;

  RelatedOpeningElement : IfcFeatureElementSubtraction;

END_ENTITY;

 EXPRESS-G diagram