IfcRelConnectsPathElements

Natural language names
Verbindet Elemente mit Pfaddefinition - Relation
Rel Connects Path Elements
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4 4.0.0.0
    IfcRelConnectsPathElements
      OwnerHistoryMODIFIEDInstantiation changed to OPTIONAL.
      RelatingPrioritiesXXMODIFIEDType changed from INTEGER to NUMBER.
      RelatedPrioritiesXXMODIFIEDType changed from INTEGER to NUMBER.
IFC4 Addendum 1 4.0.1.0
    IfcRelConnectsPathElements
      RelatingPrioritiesXXMODIFIEDType changed from NUMBER to IfcInteger.
      RelatedPrioritiesXXMODIFIEDType changed from NUMBER to IfcInteger.
Semantic definitions at the entity
Entity definition

The IfcRelConnectsPathElements relationship provides the connectivity information between two elements, which have path information.

The objectified relationship provides the additional information required to describe the connection between two path based elements that might have single or multiple layers of material. The connection type specifies where at the path based element a connection is given (at the start, in the middle or at the end).

The connection is described by a connection geometry, given within the object coordinate systems of the RelatingElement and of the RelatedElement. In case of IfcWallStandardCase as the RelatingElement and RelatedElement the connection geometry is provided by the subtype IfcConnectionCurveGeometry. Both curves indicate the so called "end cap", i.e. the curve that trims the wall outer edges (being parallel along the wall axis) at the end.

wall connection Figure 376 shows the application of IfcRelConnectsPathElements with the ConnectionGeometry of type IfcConnectionCurveGeometry. The example shows the connection relationship between two instances of IfcWallStandardCase using the IfcRelConnectsPathElements relationship. The ConnectionCurveGeometry defines the CurveOnReleatingElement and CurveOnRelatedElement, both are of type IfcPolyline.

Figure 376 — Path connection geometry

wall connection  wall connection

Figure 377 — Path connection T-Type

Figure 378 — Path connection L-Type

Figure 377 illustrates using the IfcRelConnectsPathElements for a "T" type connection between two instances of IfcWallStandardCase.

Figure 378 illustrates using the IfcRelConnectsPathElements for a "L" type connection between two instances of IfcWallStandardCase.

NOTE  The two wall axes connect in each case.

 

HISTORY  New entity in IFC1.5.

IFC4 CHANGE  The data type of RelatingPriorities and RelatedPriorities are restricted to a range o [0..100] to be a normalized ratio measure.

Attribute definitions
#AttributeTypeCardinalityDescription G
8RelatingPrioritiesIfcIntegerL[0:?] Overriding priorities at this connection. It overrides the standard priority given at the wall layer provided by IfcMaterialLayer.Priority. The list of RelatingProperties corresponds to the list of IfcMaterialLayerSet.MaterialLayers of the element referenced by RelatingObject.
IFC4 CHANGE  Data type changed to NUMBER and usage to hold a normalized ratio measure [0..1].
X
9RelatedPrioritiesIfcIntegerL[0:?] Overriding priorities at this connection. It overrides the standard priority given at the wall layer provided by IfcMaterialLayer.Priority. The list of RelatedProperties corresponds to the list of IfcMaterialLayerSet.MaterialLayers of the element referenced by RelatedObject.
IFC4 CHANGE  Data type changed to NUMBER and usage to hold a normalized ratio measure [0..1].
X
10RelatedConnectionTypeIfcConnectionTypeEnum Indication of the connection type in relation to the path of the RelatingObject. X
11RelatingConnectionTypeIfcConnectionTypeEnum Indication of the connection type in relation to the path of the RelatingObject. X
Formal Propositions
RuleDescription
NormalizedRelatingPrioritiesThe RelatingProperties shall all be given as a normalized integer range [0..100], where 0 is the lowest and 100 the highest priority of the material layers.
NormalizedRelatedPrioritiesThe RelatedProperties shall all be given as a normalized integer range [0..100], where 0 is the lowest and 100 the highest priority of the material layers.
Inherited definitions from supertypes
Entity inheritance IfcRelConnectsElements 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
IfcRelConnectsElements
5ConnectionGeometryIfcConnectionGeometry? The geometric shape representation of the connection geometry that is provided in the object coordinate system of the RelatingElement (mandatory) and in the object coordinate system of the RelatedElement (optionally). X
6RelatingElementIfcElement Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatingElement. X
7RelatedElementIfcElement Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatedElement. X
IfcRelConnectsPathElements
8RelatingPrioritiesIfcIntegerL[0:?] Overriding priorities at this connection. It overrides the standard priority given at the wall layer provided by IfcMaterialLayer.Priority. The list of RelatingProperties corresponds to the list of IfcMaterialLayerSet.MaterialLayers of the element referenced by RelatingObject.
IFC4 CHANGE  Data type changed to NUMBER and usage to hold a normalized ratio measure [0..1].
X
9RelatedPrioritiesIfcIntegerL[0:?] Overriding priorities at this connection. It overrides the standard priority given at the wall layer provided by IfcMaterialLayer.Priority. The list of RelatedProperties corresponds to the list of IfcMaterialLayerSet.MaterialLayers of the element referenced by RelatedObject.
IFC4 CHANGE  Data type changed to NUMBER and usage to hold a normalized ratio measure [0..1].
X
10RelatedConnectionTypeIfcConnectionTypeEnum Indication of the connection type in relation to the path of the RelatingObject. X
11RelatingConnectionTypeIfcConnectionTypeEnum Indication of the connection type in relation to the path of the RelatingObject. 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="IfcRelConnectsPathElements" type="ifc:IfcRelConnectsPathElements" substitutionGroup="ifc:IfcRelConnectsElements" nillable="true"/>
 <xs:complexType name="IfcRelConnectsPathElements">
  <xs:complexContent>
   <xs:extension base="ifc:IfcRelConnectsElements">
    <xs:attribute name="RelatingPriorities" use="optional">
     <xs:simpleType>
      <xs:restriction>
       <xs:simpleType>
        <xs:list itemType="ifc:IfcInteger"/>
       </xs:simpleType>
       <xs:minLength value="0"/>
      </xs:restriction>
     </xs:simpleType>
    </xs:attribute>
    <xs:attribute name="RelatedPriorities" use="optional">
     <xs:simpleType>
      <xs:restriction>
       <xs:simpleType>
        <xs:list itemType="ifc:IfcInteger"/>
       </xs:simpleType>
       <xs:minLength value="0"/>
      </xs:restriction>
     </xs:simpleType>
    </xs:attribute>
    <xs:attribute name="RelatedConnectionType" type="ifc:IfcConnectionTypeEnum" use="optional"/>
    <xs:attribute name="RelatingConnectionType" type="ifc:IfcConnectionTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcRelConnectsPathElements
 SUBTYPE OF (IfcRelConnectsElements);
  RelatingPriorities : LIST [0:?] OF IfcInteger;
  RelatedPriorities : LIST [0:?] OF IfcInteger;
  RelatedConnectionType : IfcConnectionTypeEnum;
  RelatingConnectionType : IfcConnectionTypeEnum;
 WHERE
  NormalizedRelatingPriorities : (SIZEOF(RelatingPriorities) = 0)
OR
(SIZEOF (QUERY (temp <* RelatingPriorities
| {0 <= temp <= 100}
)) = SIZEOF(RelatingPriorities));
  NormalizedRelatedPriorities : (SIZEOF(RelatedPriorities) = 0)
OR
(SIZEOF (QUERY (temp <* RelatedPriorities
| {0 <= temp <= 100}
)) = SIZEOF(RelatedPriorities));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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