IfcConic

BACnet MVD

#### IfcConic

Natural language names

| Konische Form
| Conic
| Conique

##### Semantic definitions at the entity

Entity definition

An IfcConic is a parameterized planar curve.

> NOTE Definition according to ISO/CD 10303-42:1992
> A conic is a planar curve which could be produced by intersecting a plane with a cone. A conic is defined in terms of its intrinsic geometric properties rather than being described in terms of other geometry. A conic entity always has a placement coordinate system defined by axis2_placement; the parametric representation is defined in terms of this placement coordinate system.

> NOTE Entity adapted from conic defined in ISO 10303-42

> HISTORY New entity in IFC1.0

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
1 | Position | IfcAxis2Placement |  | The location and orientation of the conic. Further details of the interpretation of this attribute are given for the individual subtypes." |  | 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
IfcCurve
| Dim :=IfcCurveDim(SELF) | IfcDimensionCount |  | The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve. | X | X
IfcConic
1 | Position | IfcAxis2Placement |  | The location and orientation of the conic. Further details of the interpretation of this attribute are given for the individual subtypes." |  | X

##### Formal representations

XML Specification
`<xs:element name="IfcConic" type="ifc:IfcConic" abstract="true" substitutionGroup="ifc:IfcCurve" nillable="true"/>
<xs:complexType name="IfcConic" abstract="true">
<xs:complexContent>
<xs:extension base="ifc:IfcCurve">
<xs:sequence>
<xs:element name="Position">
<xs:complexType>
<xs:group ref="ifc:IfcAxis2Placement"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcConic
ABSTRACT SUPERTYPE OF(ONEOF(IfcCircle, IfcEllipse))
SUBTYPE OF (IfcCurve);
Position : IfcAxis2Placement;
END_ENTITY;

EXPRESS-G diagram

`

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