6.1.3.31 IfcRelConnectsPathElements

Verbindet Elemente mit Pfaddefinition - Relation

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.

HISTORY  New entity in IFC1.5.
IFC4 CHANGE  The data type of RelatingPriorities and RelatedPriorities has been changed to NUMBER and its usage to a normalized ratio measure.

 

wall connection Figure 204 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 204 — Path connection geometry

wall connection  wall connection

Figure 205 — Path connection T-Type

Figure 206 — Path connection L-Type

Figure 205 illustrates using the IfcRelConnectsPathElements for a "T" type connection between two instances of IfcWallStandardCase.

Figure 206 illustrates using the IfcRelConnectsPathElements for a "L" type connection between two instances of IfcWallStandardCase.

NOTE  The two wall axes connect in each case.

XSD 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="xs:double"/>
       </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="xs:double"/>
       </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 OF NUMBER;
RelatedPriorities : LIST OF NUMBER;
RelatedConnectionType : IfcConnectionTypeEnum;
RelatingConnectionType : IfcConnectionTypeEnum;
WHERE
NormalizedRelatingPriorities : (SIZEOF(RelatingPriorities) = 0) OR (SIZEOF (QUERY (temp <* RelatingPriorities | {0.0 <= temp <= 1.0} )) = SIZEOF(RelatingPriorities));
NormalizedRelatedPriorities : (SIZEOF(RelatedPriorities) = 0) OR (SIZEOF (QUERY (temp <* RelatedPriorities | {0.0 <= temp <= 1.0} )) = SIZEOF(RelatedPriorities));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

RelatingPriorities : 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].
RelatedPriorities : 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].
RelatedConnectionType : Indication of the connection type in relation to the path of the RelatingObject.
RelatingConnectionType : Indication of the connection type in relation to the path of the RelatingObject.

Formal Propositions:

NormalizedRelatingPriorities : The RelatingProperties shall all be given as a normalized ratio measure [0..1].
NormalizedRelatedPriorities : The RelatedProperties shall all be given as a normalized ratio measure [0..1].

Inheritance Graph:

ENTITY IfcRelConnectsPathElements
ENTITY IfcRoot
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcRelationship
ENTITY IfcRelConnects
ENTITY IfcRelConnectsElements
ConnectionGeometry : OPTIONAL IfcConnectionGeometry;
RelatingElement : IfcElement;
RelatedElement : IfcElement;
ENTITY IfcRelConnectsPathElements
RelatingPriorities : LIST OF NUMBER;
RelatedPriorities : LIST OF NUMBER;
RelatedConnectionType : IfcConnectionTypeEnum;
RelatingConnectionType : IfcConnectionTypeEnum;
END_ENTITY;

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