IfcBoundedSurface

BACnet MVD

#### IfcBoundedSurface

Natural language names

| Begrenzte Oberfläche
| Bounded Surface
| Surface englobée

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcBoundedSurface |  |  | MODIFIED | Instantiation changed to ABSTRACT.

##### Semantic definitions at the entity

Entity definition

An IfcBoundedSurface is a surface of finite area.

> NOTE Definition according to ISO/CD 10303-42:1992
> A bounded surface is a surface of finite area with identifiable boundaries.

> NOTE Entity adapted from bounded_surface defined in ISO10303-42.

> HISTORY New entity in IFC2x

> IFC4 CHANGE Entity made abstract.

Informal Propositions:

1. A bounded surface has finite non-zero surface area.
2. A bounded surface has boundary curves.

##### 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
IfcSurface

Dim
:=3

IfcDimensionCount

The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item.

> IFC4 CHANGE Derived attribute promoted from subtypes.

X

X

IfcBoundedSurface

##### Formal representations

XML Specification
`<xs:element name="IfcBoundedSurface" type="ifc:IfcBoundedSurface" abstract="true" substitutionGroup="ifc:IfcSurface" nillable="true"/>
<xs:complexType name="IfcBoundedSurface" abstract="true">
<xs:complexContent>
<xs:extension base="ifc:IfcSurface"/>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcBoundedSurface
ABSTRACT SUPERTYPE OF(ONEOF(IfcBSplineSurface, IfcCurveBoundedPlane, IfcCurveBoundedSurface, IfcRectangularTrimmedSurface))
SUBTYPE OF (IfcSurface);
END_ENTITY;

EXPRESS-G diagram

`

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