IfcOpenCrossProfileDef

Natural language names
Change log
ItemSPFXMLChangeDescription
IFC4x2 to IFC4x3_RC1
    IfcOpenCrossProfileDefADDED
Semantic definitions at the entity
Entity definition

A two-dimensional open profile defined by widths and slopes for the use within the swept surface geometry, in SectionedSurface in particular. The underlying coordinate system is defined by the swept surface that uses the profile definition; when used in SectionedSurface it is the XY plane of each list member of SectionedSurface.CrossSectionPositions where the profile X axis is oriented perpendicularly to the left of the Directrix (same direction as positive LateralOffset at IfcDistanceExpression) as facing forward along the directrix, and the profile Y axis is oriented upwards or vertically perpendicular to the Directrix depending on the usage in the SectionedSurface. The behaviour of OpenCrossProfileDef in sweeping operation can be controlled by attribute Tags. Tags allow two consecutive cross sections to have different number of break points: points with the same tag value are connected either by assuming linear longitudinal breakline between them, or by a guide curve identified by the same Tag value as the cross section points. ***Formal propositions: The profile type shall be CURVE.

IfcOpenCrossProfileDef-1

Attribute definitions
#AttributeTypeCardinalityDescription G
3HorizontalWidthsIfcBoolean Indicates if the widths shall be measured horizontally or along the slopes. X
4WidthsIfcNonNegativeLengthMeasureL[1:?] The horizontal widths (when HorizontalWidths=.T.) or distances along the Slope (when HorizontalWidths=.F.) for the segments in the profile. And if Horizontal=.T. the Slopes shall not be = +/- 90 deg. X
5SlopesIfcPlaneAngleMeasureL[1:?] The slope measure. X
6TagsIfcLabel? L[2:?] X
Inherited definitions from supertypes
Entity inheritance IfcProfileDef
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
IfcOpenCrossProfileDef
3HorizontalWidthsIfcBoolean Indicates if the widths shall be measured horizontally or along the slopes. X
4WidthsIfcNonNegativeLengthMeasureL[1:?] The horizontal widths (when HorizontalWidths=.T.) or distances along the Slope (when HorizontalWidths=.F.) for the segments in the profile. And if Horizontal=.T. the Slopes shall not be = +/- 90 deg. X
5SlopesIfcPlaneAngleMeasureL[1:?] The slope measure. X
6TagsIfcLabel? L[2:?] 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="IfcOpenCrossProfileDef" type="ifc:IfcOpenCrossProfileDef" substitutionGroup="ifc:IfcProfileDef" nillable="true"/>
 <xs:complexType name="IfcOpenCrossProfileDef">
  <xs:complexContent>
   <xs:extension base="ifc:IfcProfileDef">
    <xs:attribute name="HorizontalWidths" type="ifc:IfcBoolean" use="optional"/>
    <xs:attribute name="Widths" use="optional">
     <xs:simpleType>
      <xs:restriction>
       <xs:simpleType>
        <xs:list itemType="ifc:IfcNonNegativeLengthMeasure"/>
       </xs:simpleType>
      </xs:restriction>
     </xs:simpleType>
    </xs:attribute>
    <xs:attribute name="Slopes" use="optional">
     <xs:simpleType>
      <xs:restriction>
       <xs:simpleType>
        <xs:list itemType="ifc:IfcPlaneAngleMeasure"/>
       </xs:simpleType>
      </xs:restriction>
     </xs:simpleType>
    </xs:attribute>
    <xs:attribute name="Tags" use="optional">
     <xs:simpleType>
      <xs:restriction>
       <xs:simpleType>
        <xs:list itemType="ifc:IfcLabel"/>
       </xs:simpleType>
       <xs:minLength value="2"/>
      </xs:restriction>
     </xs:simpleType>
    </xs:attribute>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcOpenCrossProfileDef
 SUBTYPE OF (IfcProfileDef);
  HorizontalWidths : IfcBoolean;
  Widths : LIST [1:?] OF IfcNonNegativeLengthMeasure;
  Slopes : LIST [1:?] OF IfcPlaneAngleMeasure;
  Tags : OPTIONAL LIST [2:?] OF IfcLabel;
 WHERE
  CorrectProfileType : SELF\IfcProfileDef.ProfileType = IfcProfileTypeEnum.CURVE;
  CorrespondingSlopeWidths : SIZEOF(Slopes) = SIZEOF(Widths);
  CorrespondingTags : (NOT EXISTS (Tags)) OR (SIZEOF(Tags) = (SIZEOF(Slopes) + 1));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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