IfcRelConnectsPathElements

BACnet MVD

#### IfcRelConnectsPathElements

Natural language names

| Verbindet Elemente mit Pfaddefinition - Relation
| Rel Connects Path Elements

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcRelConnectsPathElements |  |  |  |
OwnerHistory |  |  | MODIFIED | Instantiation changed to OPTIONAL.
RelatingPriorities | X | X | MODIFIED | Type changed from INTEGER to NUMBER.
RelatedPriorities | X | X | MODIFIED | Type changed from INTEGER to NUMBER.
IFC4 Addendum 1
IfcRelConnectsPathElements |  |  |  |
RelatingPriorities | X | X | MODIFIED | Type changed from NUMBER to IfcInteger.
RelatedPriorities | X | X | MODIFIED | Type 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.

| Figure 222 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 222 — Path connection geometry |

Figure 223 — Path connection T-Type | Figure 224 — Path connection L-Type
Figure 223 illustrates using the IfcRelConnectsPathElements for a "T" type connection between two instances of IfcWallStandardCase. | Figure 224 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

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---

8

RelatingPriorities

IfcInteger

L[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

X

9

RelatedPriorities

IfcInteger

L[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

X

10 | RelatedConnectionType | IfcConnectionTypeEnum |  | Indication of the connection type in relation to the path of the RelatingObject. | X | X
11 | RelatingConnectionType | IfcConnectionTypeEnum |  | Indication of the connection type in relation to the path of the RelatingObject. | X | X

Formal Propositions

Rule | Description
--- | ---
NormalizedRelatingPriorities | The 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.
NormalizedRelatedPriorities | The 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
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcRoot
1 | GlobalId | IfcGloballyUniqueId |  | Assignment of a globally unique identifier within the entire software world. | X | X

2

OwnerHistory

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.

X

X

3 | Name | 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. | X | X
4 | Description | IfcText | ? | Optional description, provided for exchanging informative comments. |  | X
IfcRelationship
IfcRelConnects
IfcRelConnectsElements
5 | ConnectionGeometry | IfcConnectionGeometry | ? | 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 | X
6 | RelatingElement | IfcElement |  | Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatingElement. | X | X
7 | RelatedElement | IfcElement |  | Reference to a subtype of IfcElement that is connected by the connection relationship in the role of RelatedElement. | X | X
IfcRelConnectsPathElements

8

RelatingPriorities

IfcInteger

L[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

X

9

RelatedPriorities

IfcInteger

L[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

X

10 | RelatedConnectionType | IfcConnectionTypeEnum |  | Indication of the connection type in relation to the path of the RelatingObject. | X | X
11 | RelatingConnectionType | IfcConnectionTypeEnum |  | Indication of the connection type in relation to the path of the RelatingObject. | X | X

##### Definitions applying to Design Transfer View

Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View

##### Definitions applying to BACnet View

Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View

##### 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;

EXPRESS-G diagram

`

Link to this page