﻿ IfcArbitraryProfileDefWithVoids

IfcArbitraryProfileDefWithVoids

Natural language names
 Beliebiges geschlossenes Profil mit Löchern Arbitrary Profile Def With Voids
Semantic definitions at the entity
Entity 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.

HISTORY  New entity in IFC2x.

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 411 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:

• IfcSweptAreaSolid.Position

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.

 Figure 411 — Arbitrary profile with voids
Attribute definitions
#AttributeTypeCardinalityDescription G
4InnerCurvesIfcCurveS[1:?] Set of bounded curves, defining the inner boundaries of the arbitrary profile.X
Formal Propositions
RuleDescription
WR1The type of the profile shall be AREA, as it can only be involved in the definition of a swept area.
WR2All inner curves shall have the dimensionality of 2.
WR3None of the inner curves shall by of type IfcLine, as an IfcLine can not be a closed curve.
Inherited definitions from supertypes
Entity inheritance
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcProfileDef
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
HasExternalReferenceIfcExternalReferenceRelationship
@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
HasPropertiesIfcProfileProperties
@ProfileDefinition
S[0:?]Additional properties of the profile, for example mechanical properties.
IFC4 CHANGE New inverse attribute
X
IfcArbitraryClosedProfileDef
3OuterCurveIfcCurve Bounded curve, defining the outer boundaries of the arbitrary profile.X
IfcArbitraryProfileDefWithVoids
4InnerCurvesIfcCurveS[1:?] Set of bounded curves, defining the inner boundaries of the arbitrary profile.X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
IfcProfileDef
Property Sets for ObjectsProperty Sets for ObjectsGeneral Usage

Formal representations
XML Specification
``` <xs:element name="IfcArbitraryProfileDefWithVoids" type="ifc:IfcArbitraryProfileDefWithVoids" substitutionGroup="ifc:IfcArbitraryClosedProfileDef" nillable="true"/>  <xs:complexType name="IfcArbitraryProfileDefWithVoids">   <xs:complexContent>    <xs:extension base="ifc:IfcArbitraryClosedProfileDef">     <xs:sequence>      <xs:element name="InnerCurves">       <xs:complexType>        <xs:sequence>         <xs:element ref="ifc:IfcCurve" maxOccurs="unbounded"/>        </xs:sequence>        <xs:attribute ref="ifc:itemType" fixed="ifc:IfcCurve"/>        <xs:attribute ref="ifc:cType" fixed="set"/>        <xs:attribute ref="ifc:arraySize" use="optional"/>       </xs:complexType>      </xs:element>     </xs:sequence>    </xs:extension>   </xs:complexContent>  </xs:complexType> ```
EXPRESS Specification
``` ENTITY IfcArbitraryProfileDefWithVoids  SUBTYPE OF (IfcArbitraryClosedProfileDef);   InnerCurves : SET [1:?] OF IfcCurve;  WHERE   WR1 : SELF\IfcProfileDef.ProfileType = AREA;  WR2 : SIZEOF(QUERY(temp <* InnerCurves | temp.Dim <> 2)) = 0;  WR3 : SIZEOF(QUERY(temp <* InnerCurves | 'IFCGEOMETRYRESOURCE.IfcLine' IN TYPEOF(temp))) = 0;END_ENTITY;  EXPRESS-G diagram ```

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