IfcSubedge

BACnet MVD

#### IfcSubedge

Natural language names

| Teilkante - Topologie
| Subedge
| Sous arête

##### Semantic definitions at the entity

Entity definition

> NOTE Definition according to ISO/CD 10303-42:1992
> A subedge is an edge whose domain is a connected portion of the domain of an existing edge. The topological constraints on a subedge are the same as those on an edge.

> NOTE Entity adapted from subedge defined in ISO 10303-42.

> HISTORY New entity in IFC2x2.

Informal Propositions:

1. The domain of the subedge is formally defined to be the domain of the parent edge, as trimmed by the subedge start vertex and subedge end vertex.
2. The start vertex and end vertex shall be within the union of the domains of the vertices of the parent edge and the domain of the parent edge.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
3 | ParentEdge | IfcEdge |  | The Edge, or Subedge, which contains the Subedge. |  | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

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

LayerAssignment

IfcPresentationLayerAssignment
@AssignedItems

S[0:1]

Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.

> IFC2x3 CHANGE The inverse attribute LayerAssignments has been added.

> IFC4 CHANGE The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.

X

StyledByItem

IfcStyledItem
@Item

S[0:1]

Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.

> IFC2x3 CHANGE The inverse attribute StyledByItem has been added.

X

X

IfcTopologicalRepresentationItem
IfcEdge
1 | EdgeStart | IfcVertex |  | Start point (vertex) of the edge. | X | X
2 | EdgeEnd | IfcVertex |  | End point (vertex) of the edge. The same vertex can be used for both EdgeStart and EdgeEnd. | X | X
IfcSubedge
3 | ParentEdge | IfcEdge |  | The Edge, or Subedge, which contains the Subedge. |  | X

##### Formal representations

XML Specification
`<xs:element name="IfcSubedge" type="ifc:IfcSubedge" substitutionGroup="ifc:IfcEdge" nillable="true"/>
<xs:complexType name="IfcSubedge">
<xs:complexContent>
<xs:extension base="ifc:IfcEdge">
<xs:sequence>
<xs:element name="ParentEdge" type="ifc:IfcEdge" nillable="true"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcSubedge
SUBTYPE OF (IfcEdge);
ParentEdge : IfcEdge;
END_ENTITY;

EXPRESS-G diagram

`

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