IfcRelInterferesElements

Natural language names
Kollision zwischen Elementen - Relation
Rel Interferes Elements
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcRelInterferesElementsADDED
Semantic definitions at the entity
Entity definition

The IfcRelInterferesElements objectified relationship indicates that two elements interfere. Interference is a spatial overlap between the two elements. It is a 1 to 1 relationship. The concept of two elements interfering physically or logically is described independently from the elements. The interference may be related to the shape representation of the entities by providing an interference geometry.

The RelatingElement and RelatedElement define the two elements in the relationship, that may have different roles. This is controlled by the attribute ImpliedOrder.

HISTORY  New entity in IFC4.
Attribute definitions
#AttributeTypeCardinalityDescription G
5RelatingElementIfcElement Reference to a subtype of IfcElement that is the RelatingElement in the interference relationship. Depending on the value of ImpliedOrder the RelatingElement may carry the notion to be the element from which the interference geometry should be subtracted.X
6RelatedElementIfcElement Reference to a subtype of IfcElement that is the RelatedElement in the interference relationship. Depending on the value of ImpliedOrder the RelatedElement may carry the notion to be the element from which the interference geometry should not be subtracted.X
7InterferenceGeometryIfcConnectionGeometry? The geometric shape representation of the interference geometry that is provided in the object coordinate system of the RelatingElement (mandatory) and in the object coordinate system of the RelatedElement (optionally).X
8InterferenceTypeIfcIdentifier? Optional identifier that describes the nature of the interference. Examples could include 'Clash', 'ProvisionForVoid', etc.X
9ImpliedOrderLOGICAL Logical value indicating whether the interference geometry should be subtracted from the RelatingElement (if TRUE), or whether it should be either subtracted from the RelatingElement or the RelatedElement (if FALSE), or whether no indication can be provided (if UNKNOWN).X
Formal Propositions
RuleDescription
NoSelfReferenceThe instance of the RelatingElement shall not be the same instance as the RelatedElement.
Inherited definitions from supertypes
Entity inheritance IfcRelConnects IfcRelationship IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRoot
1GlobalIdIfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory? 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 - either as addition, deletion or modification.
IFC4 CHANGE  The attribute has been changed to be OPTIONAL.
X
3NameIfcLabel? 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
4DescriptionIfcText? Optional description, provided for exchanging informative comments.X
IfcRelationship
IfcRelConnects
IfcRelInterferesElements
5RelatingElementIfcElement Reference to a subtype of IfcElement that is the RelatingElement in the interference relationship. Depending on the value of ImpliedOrder the RelatingElement may carry the notion to be the element from which the interference geometry should be subtracted.X
6RelatedElementIfcElement Reference to a subtype of IfcElement that is the RelatedElement in the interference relationship. Depending on the value of ImpliedOrder the RelatedElement may carry the notion to be the element from which the interference geometry should not be subtracted.X
7InterferenceGeometryIfcConnectionGeometry? The geometric shape representation of the interference geometry that is provided in the object coordinate system of the RelatingElement (mandatory) and in the object coordinate system of the RelatedElement (optionally).X
8InterferenceTypeIfcIdentifier? Optional identifier that describes the nature of the interference. Examples could include 'Clash', 'ProvisionForVoid', etc.X
9ImpliedOrderLOGICAL Logical value indicating whether the interference geometry should be subtracted from the RelatingElement (if TRUE), or whether it should be either subtracted from the RelatingElement or the RelatedElement (if FALSE), or whether no indication can be provided (if UNKNOWN).X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcRelInterferesElements" type="ifc:IfcRelInterferesElements" substitutionGroup="ifc:IfcRelConnects" nillable="true"/>
 <xs:complexType name="IfcRelInterferesElements">
  <xs:complexContent>
   <xs:extension base="ifc:IfcRelConnects">
    <xs:sequence>
     <xs:element name="RelatingElement" type="ifc:IfcElement" nillable="true"/>
     <xs:element name="RelatedElement" type="ifc:IfcElement" nillable="true"/>
     <xs:element name="InterferenceGeometry" type="ifc:IfcConnectionGeometry" nillable="true" minOccurs="0"/>
    </xs:sequence>
    <xs:attribute name="InterferenceType" type="ifc:IfcIdentifier" use="optional"/>
    <xs:attribute name="ImpliedOrder" type="ifc:logical" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcRelInterferesElements
 SUBTYPE OF (IfcRelConnects);
  RelatingElement : IfcElement;
  RelatedElement : IfcElement;
  InterferenceGeometry : OPTIONAL IfcConnectionGeometry;
  InterferenceType : OPTIONAL IfcIdentifier;
  ImpliedOrder : LOGICAL;
 WHERE
  NoSelfReference : RelatingElement :<>: RelatedElement;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcElement

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