8.15.3.2 IfcArbitraryOpenProfileDef

8.15.3.2.1 Semantic 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.

Informal Propositions

The Curve has to be an open curve.

Figure 8.15.3.2.A 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 8.15.3.2.A — Arbitrary open profile

8.15.3.2.2 Entity inheritance

8.15.3.2.3 Attributes

#	Attribute	Type	Description
IfcProfileDef (4)
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.
2	ProfileName	OPTIONAL 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.
	HasExternalReference	SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects	Reference to external information, e.g. library, classification, or document information, which is associated with the profile. IFC4-CHANGE New inverse attribute
	HasProperties	SET [0:?] OF IfcProfileProperties FOR ProfileDefinition	Additional properties of the profile, for example mechanical properties. IFC4-CHANGE New inverse attribute
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IfcArbitraryOpenProfileDef (1)
3	Curve	IfcBoundedCurve	Open bounded curve defining the profile.

Table 8.15.3.2.B

8.15.3.2.4 Formal propositions

Name	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 IfcCenterLineProfileDef.
`('IFC4X3_DEV_20bdb3d.IFCCENTERLINEPROFILEDEF' IN TYPEOF(SELF)) OR (SELF\IfcProfileDef.ProfileType = IfcProfileTypeEnum.CURVE)`
WR12	The dimensionality of the curve shall be 2.
`Curve.Dim = 2`

Table 8.15.3.2.C

8.15.3.2.5 Property sets

Pset_ProfileMechanical
- MassPerLength
- CrossSectionArea
- Perimeter
- MinimumPlateThickness
- MaximumPlateThickness
- CentreOfGravityInX
- CentreOfGravityInY
- ShearCentreZ
- ShearCentreY
- MomentOfInertiaY
- MomentOfInertiaZ
- MomentOfInertiaYZ
- TorsionalConstantX
- WarpingConstant
- ShearDeformationAreaZ
- ShearDeformationAreaY
- MaximumSectionModulusY
- MinimumSectionModulusY
- MaximumSectionModulusZ
- MinimumSectionModulusZ
- TorsionalSectionModulus
- ShearAreaZ
- ShearAreaY
- PlasticShapeFactorY
- PlasticShapeFactorZ

8.15.3.2.6 Concept usage

Concept	Usage	Description
IfcProfileDef (1)
Property Sets for Profiles	General	This concept can be applied to the following resources: Pset_ProfileMechanical
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Concept

Usage

Description

IfcProfileDef (1)

Property Sets for Profiles

General

This concept can be applied to the following resources:

Pset_ProfileMechanical

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Table 8.15.3.2.D

8.15.3.2.7 Formal representation

ENTITY IfcArbitraryOpenProfileDef
 SUPERTYPE OF (ONEOF
	(IfcCenterLineProfileDef))
 SUBTYPE OF (IfcProfileDef);
	Curve : IfcBoundedCurve;
 WHERE
	WR11 : ('IFC4X3_DEV_20bdb3d.IFCCENTERLINEPROFILEDEF' IN TYPEOF(SELF)) OR 
 (SELF\IfcProfileDef.ProfileType = IfcProfileTypeEnum.CURVE);
	WR12 : Curve.Dim = 2;
END_ENTITY;