Natural language names
Beliebiges geschlossenes Profil
Arbitrary Closed Profile Def
Semantic definitions at the entity
Entity definition

The closed profile IfcArbitraryClosedProfileDef defines an arbitrary two-dimensional profile for the use within the swept surface geometry, the swept area solid or a sectioned spine. It is given by an outer boundary from which the surface or solid can be constructed.

HISTORY  New entity in IFC1.5. Entity has been renamed from IfcArbitraryProfileDef in IFC2x.

Informal Propositions:

  1. The OuterCurve has to be a closed curve.
  2. The OuterCurve shall not intersect.

Figure 409 illustrates the arbitrary closed profile definition. The OuterCurve is defined in the underlying coordinate system. The underlying coordinate system is defined by the swept surface or swept area solid that uses the profile definition. It is the xy plane of either:

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.

arbitrary profile without boundaries

Figure 409 — Arbitrary closed profile

Attribute definitions
#AttributeTypeCardinalityDescription G
3OuterCurveIfcCurve Bounded curve, defining the outer boundaries of the arbitrary profile.X
Formal Propositions
WR1The curve used for the outer curve definition shall have the dimensionality of 2.
WR2The outer curve shall not be of type IfcLine as IfcLine is not a closed curve.
WR3The outer curve shall not be of type IfcOffsetCurve2D as it should not be defined as an offset of another curve.
Inherited definitions from supertypes
Entity inheritance IfcArbitraryProfileDefWithVoids IfcProfileDef
Attribute inheritance
1ProfileTypeIfcProfileTypeEnum 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
2ProfileNameIfcLabel? 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
S[0:?]Reference to external information, e.g. library, classification, or document information, which is associated with the profile.
IFC4 CHANGE New inverse attribute
S[0:?]Additional properties of the profile, for example mechanical properties.
IFC4 CHANGE New inverse attribute
3OuterCurveIfcCurve Bounded curve, defining the outer boundaries of the arbitrary profile.X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
Property Sets for ObjectsProperty Sets for ObjectsGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcArbitraryClosedProfileDef" type="ifc:IfcArbitraryClosedProfileDef" substitutionGroup="ifc:IfcProfileDef" nillable="true"/>
 <xs:complexType name="IfcArbitraryClosedProfileDef">
   <xs:extension base="ifc:IfcProfileDef">
     <xs:element name="OuterCurve" type="ifc:IfcCurve" nillable="true"/>
EXPRESS Specification
ENTITY IfcArbitraryClosedProfileDef
 SUPERTYPE OF(IfcArbitraryProfileDefWithVoids)
 SUBTYPE OF (IfcProfileDef);
  OuterCurve : IfcCurve;
  WR1 : OuterCurve.Dim = 2;

Link to EXPRESS-G diagram EXPRESS-G diagram

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