IfcArbitraryOpenProfileDef

BACnet MVD

#### IfcArbitraryOpenProfileDef

Natural language names

| Beliebiges offenes Profil
| Arbitrary Open Profile Def

##### Semantic definitions at the entity

Entity definition

The open profile IfcArbitraryOpenProfileDef defines an arbitrary two-dimensional open profile for the use within the swept surface geometry. It is given by an open boundary from which the surface can be constructed.

> HISTORY New entity in IFC2x.

Informal Propositions:

1. The Curve has to be an open curve.

Figure 356 illustrates the arbitrary open profile definition. The Curve is defined in the underlying coordinate system. The underlying coordinate system is defined by the swept surface that uses the profile definition. It is the xy plane of:

- IfcSweptSurface.Position

The Curve attribute defines a two dimensional open bounded curve.

Figure 356 — Arbitrary open profile

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
3 | Curve | IfcBoundedCurve |  | Open bounded curve defining the profile. |  | X

Formal Propositions

Rule | Description
--- | ---

WR11

The profile type is a .CURVE., an open profile can only be used to define a swept surface.

> Note This does not apply to the subtype IfcCentreLineProfileDef.

WR12 | The dimensionality of the curve shall be 2.

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcProfileDef
1 | ProfileType | IfcProfileTypeEnum |  | Defines the type of geometry into which this profile definition shall be resolved, either a curve or a surface area. In case of curve the profile should be referenced by a swept surface, in case of area the profile should be referenced by a swept area solid. | X | X
2 | ProfileName | IfcLabel | ? | Human-readable name of the profile, for example according to a standard profile table. As noted above, machine-readable standardized profile designations should be provided in IfcExternalReference.ItemReference. | X | X

HasExternalReference

IfcExternalReferenceRelationship
@RelatedResourceObjects

S[0:?]

Reference to external information, e.g. library, classification, or document information, which is associated with the profile.

> IFC4 CHANGE New inverse attribute

X

HasProperties

IfcProfileProperties
@ProfileDefinition

S[0:?]

Additional properties of the profile, for example mechanical properties.

> IFC4 CHANGE New inverse attribute

X

IfcArbitraryOpenProfileDef
3 | Curve | IfcBoundedCurve |  | Open bounded curve defining the profile. |  | X

##### Formal representations

XML Specification
`<xs:element name="IfcArbitraryOpenProfileDef" type="ifc:IfcArbitraryOpenProfileDef" substitutionGroup="ifc:IfcProfileDef" nillable="true"/>
<xs:complexType name="IfcArbitraryOpenProfileDef">
<xs:complexContent>
<xs:extension base="ifc:IfcProfileDef">
<xs:sequence>
<xs:element name="Curve" type="ifc:IfcBoundedCurve" nillable="true"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcArbitraryOpenProfileDef
SUPERTYPE OF(IfcCenterLineProfileDef)
SUBTYPE OF (IfcProfileDef);
Curve : IfcBoundedCurve;
WHERE
WR11 : ('IFCPROFILERESOURCE.IfcCenterLineProfileDef' IN TYPEOF(SELF)) OR
(SELF\IfcProfileDef.ProfileType = IfcProfileTypeEnum.CURVE);
WR12 : Curve.Dim = 2;
END_ENTITY;

EXPRESS-G diagram

`

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