IfcPlanarExtent

BACnet MVD

#### IfcPlanarExtent

Natural language names

| Flächiges Ausmaß
| Planar Extent
| Extension planaire

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcPlanarExtent |  |  | MOVED | Schema changed from IFCPRESENTATIONRESOURCE to IFCPRESENTATIONDEFINITIONRESOURCE.

##### Semantic definitions at the entity

Entity definition

The planar extent defines the extent along the two axes of the two-dimensional coordinate system, independently of its position. If the planar extent is used within a three-dimensional coordinate system, it defines the extent along the x and y axes.

> NOTE Entity adapted from planar_extent defined in ISO10303-46

> HISTORY New entity in IFC2x2.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
1 | SizeInX | IfcLengthMeasure |  | The extent in the direction of the x-axis. |  | X
2 | SizeInY | IfcLengthMeasure |  | The extent in the direction of the y-axis. |  | 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

IfcGeometricRepresentationItem
IfcPlanarExtent
1 | SizeInX | IfcLengthMeasure |  | The extent in the direction of the x-axis. |  | X
2 | SizeInY | IfcLengthMeasure |  | The extent in the direction of the y-axis. |  | X

##### Formal representations

XML Specification
`<xs:element name="IfcPlanarExtent" type="ifc:IfcPlanarExtent" substitutionGroup="ifc:IfcGeometricRepresentationItem" nillable="true"/>
<xs:complexType name="IfcPlanarExtent">
<xs:complexContent>
<xs:extension base="ifc:IfcGeometricRepresentationItem">
<xs:attribute name="SizeInX" type="ifc:IfcLengthMeasure" use="optional"/>
<xs:attribute name="SizeInY" type="ifc:IfcLengthMeasure" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcPlanarExtent
SUPERTYPE OF(IfcPlanarBox)
SUBTYPE OF (IfcGeometricRepresentationItem);
SizeInX : IfcLengthMeasure;
SizeInY : IfcLengthMeasure;
END_ENTITY;

EXPRESS-G diagram

`

References: IfcTextLiteralWithExtent

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