IFC 4.3.x development

6.1.3.37 IfcRelConnectsPathElements

Change log

IFC4

additions where_rules NormalizedRelatedPriorities
additions where_rules NormalizedRelatingPriorities
modificationsattributes RelatedPriorities definition Changed from list[0:?] of integer to list[0:?] of IfcInteger
modificationsattributes RelatingPriorities definitionChanged from list[0:?] of integer to list[0:?] of IfcInteger

6.1.3.37.1 Semantic definitions at the entity

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 1 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 1 — Path connection geometry

wall connection  wall connection

Figure 2 — Path connection T-Type

Figure 3 — Path connection L-Type

Figure 2 illustrates using the IfcRelConnectsPathElements for a "T" type connection between two instances of IfcWallStandardCase.

Figure 3 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.

6.1.3.37.1 Attributes

#Attribute Type Description
IfcRoot
1GlobalId IfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world.
2OwnerHistory 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,

> NOTE  only the last modification in stored - either as addition, deletion or modification.

> IFC4 CHANGE  The attribute has been changed to be OPTIONAL.
3Name OPTIONAL IfcLabel 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.
4Description OPTIONAL IfcText Optional description, provided for exchanging informative comments.
IfcRelationship
IfcRelConnects
IfcRelConnectsElements
5ConnectionGeometry OPTIONAL IfcConnectionGeometryThe 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).
6RelatingElement IfcElement Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatingElement.
7RelatedElement IfcElement Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatedElement.
IfcRelConnectsPathElements
8RelatingPriorities LIST [0:?] OF IfcInteger 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].
9RelatedPriorities LIST [0:?] OF IfcInteger 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].
10RelatedConnectionType IfcConnectionTypeEnum Indication of the connection type in relation to the path of the RelatingObject.
11RelatingConnectionTypeIfcConnectionTypeEnum Indication of the connection type in relation to the path of the RelatingObject.

6.1.3.37.2 Entity inheritance

dot_inheritance IfcRelConnectsPathElements IfcRelConnectsPathElements IfcRelConnectsElements IfcRelConnectsElements IfcRelConnectsPathElements->IfcRelConnectsElements IfcRelConnectsWithRealizingElements IfcRelConnectsWithRealizingElements IfcRelConnectsWithRealizingElements->IfcRelConnectsElements IfcRelConnects IfcRelConnects IfcRelConnectsElements->IfcRelConnects IfcRelConnects_children 15 more... IfcRelConnects_children->IfcRelConnects IfcRelationship IfcRelationship IfcRelConnects->IfcRelationship IfcRelationship_children 5 more... IfcRelationship_children->IfcRelationship IfcRoot IfcRoot IfcRelationship->IfcRoot IfcObjectDefinition IfcObjectDefinition IfcObjectDefinition->IfcRoot IfcPropertyDefinition IfcPropertyDefinition IfcPropertyDefinition->IfcRoot

6.1.3.37.3 Definitions applying to General Usage

6.1.3.37.3.1 Identity

IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.

6.1.3.37.3.2 Revision Control

Ownership, history, and merge state is captured using IfcOwnerHistory.

6.1.3.37.4 Formal representations

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;