IFC (IFC4X3) development IfcArbitraryProfileDefWithVoids Semantic definition

The IfcArbitraryProfileDefWithVoids defines an arbitrary closed two-dimensional profile with holes. It is given by an outer boundary and inner boundaries. A common usage of IfcArbitraryProfileDefWithVoids is as the cross section for the creation of swept surfaces or swept solids.

Informal Propositions:

  1. The outer curve and all inner curves shall be closed curves.
  2. The outer curve shall enclose all inner curves.
  3. No inner curve shall intersect with the outer curve or any other inner curve. That is, no two curves of the profile definition shall have a point or segment in common, taken into account the geometric precision factor of the geometric representation context. In other words, curves must neither cross nor touch each other.
  4. No inner curve may enclose another inner curve.

Figure illustrates the arbitrary closed profile definition with voids. The OuterCurve, defined at the supertype IfcArbitraryClosedProfileDef and the inner curves are defined in the same underlying coordinate system. The common underlying coordinate system is defined by the swept area solid that uses the profile definition. It is the xy plane of:

or in case of sectioned spines the xy plane of each list member of IfcSectionedSpine.CrossSectionPositions. The OuterCurve attribute defines a two dimensional closed bounded curve, the InnerCurves define a set of two dimensional closed bounded curves.

arbitrary profile with inner boundaries
Figure — Arbitrary profile with voids Entity inheritance 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.

HasProperties SET [0:?] OF IfcProfileProperties FOR ProfileDefinition

Additional properties of the profile, for example mechanical properties.

IfcArbitraryClosedProfileDef (1)
3 OuterCurve IfcCurve

Bounded curve, defining the outer boundaries of the arbitrary profile.

Click to show 5 hidden inherited attributes Click to hide 5 inherited attributes
IfcArbitraryProfileDefWithVoids (1)
4 InnerCurves SET [1:?] OF IfcCurve

Set of bounded curves, defining the inner boundaries of the arbitrary profile.

Table Formal propositions

Name Description

The type of the profile shall be AREA, as it can only be involved in the definition of a swept area.

SELF\IfcProfileDef.ProfileType = AREA

All inner curves shall have the dimensionality of 2.

SIZEOF(QUERY(temp <* InnerCurves | temp.Dim <> 2)) = 0

None of the inner curves shall by of type IfcLine, as an IfcLine can not be a closed curve.

SIZEOF(QUERY(temp <* InnerCurves | 'IFC4X3_DEV_64d1fa4d.IFCLINE' IN TYPEOF(temp))) = 0
Table Property sets

  • Pset_ProfileArbitraryDoubleT
    • OverallWidth
    • LeftFlangeWidth
    • RightFlangeWidth
    • OverallDepth
    • FlangeDepth
    • FlangeDraft
    • FlangeChamfer
    • FlangeBaseFillet
    • FlangeTopFillet
    • StemBaseWidth
    • StemTopWidth
    • StemBaseChamfer
    • StemTopChamfer
    • StemBaseFillet
    • StemTopFillet
  • Pset_ProfileArbitraryHollowCore
    • OverallWidth
    • OverallDepth
    • EdgeDraft
    • DraftBaseOffset
    • DraftSideOffset
    • BaseChamfer
    • KeyDepth
    • KeyHeight
    • KeyOffset
    • BottomCover
    • CoreSpacing
    • CoreBaseHeight
    • CoreMiddleHeight
    • CoreTopHeight
    • CoreBaseWidth
    • CoreTopWidth
    • CenterCoreSpacing
    • CenterCoreBaseHeight
    • CenterCoreMiddleHeight
    • CenterCoreTopHeight
    • CenterCoreBaseWidth
    • CenterCoreTopWidth
    • NumberOfCores
  • 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 Concept usage

Concept Usage Description
IfcProfileDef (1)
Property Sets for Profiles General

This concept can be applied to the following resources:

IfcArbitraryClosedProfileDef (1)
Property Sets for Profiles General

This concept can be applied to the following resources:

Click to show 2 hidden inherited concepts Click to hide 2 inherited concepts
IfcArbitraryProfileDefWithVoids (1)
Property Sets for Profiles General

This concept can be applied to the following resources:

Table Formal representation

ENTITY IfcArbitraryProfileDefWithVoids
 SUBTYPE OF (IfcArbitraryClosedProfileDef);
	InnerCurves : SET [1:?] OF IfcCurve;
	WR1 : SELF\IfcProfileDef.ProfileType = AREA;
	WR2 : SIZEOF(QUERY(temp <* InnerCurves | temp.Dim <> 2)) = 0;
	WR3 : SIZEOF(QUERY(temp <* InnerCurves | 'IFC4X3_DEV_64d1fa4d.IFCLINE' IN TYPEOF(temp))) = 0;
END_ENTITY; References

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