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 410 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:

The Curve attribute defines a two dimensional open bounded curve.

arbitrary profile without boundaries

Figure 410 — Arbitrary open profile

Attribute definitions
#AttributeTypeCardinalityDescription G
3CurveIfcBoundedCurve Open bounded curve defining the profile.X
Formal Propositions
WR11The 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.
WR12The dimensionality of the curve shall be 2.
Inherited definitions from supertypes
Entity inheritance IfcCenterLineProfileDef 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
3CurveIfcBoundedCurve Open bounded curve defining the 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="IfcArbitraryOpenProfileDef" type="ifc:IfcArbitraryOpenProfileDef" substitutionGroup="ifc:IfcProfileDef" nillable="true"/>
 <xs:complexType name="IfcArbitraryOpenProfileDef">
   <xs:extension base="ifc:IfcProfileDef">
     <xs:element name="Curve" type="ifc:IfcBoundedCurve" nillable="true"/>
EXPRESS Specification
ENTITY IfcArbitraryOpenProfileDef
 SUPERTYPE OF(IfcCenterLineProfileDef)
 SUBTYPE OF (IfcProfileDef);
  Curve : IfcBoundedCurve;
(SELF\IfcProfileDef.ProfileType = IfcProfileTypeEnum.CURVE);
  WR12 : Curve.Dim = 2;

Link to EXPRESS-G diagram EXPRESS-G diagram

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