IfcDirectrixDistanceSweptAreaSolid

Item	SPF	XML	Change	Description
IFC4x2 to IFC4x3_RC1
IfcDirectrixDistanceSweptAreaSolid			ADDED

Semantic definitions at the entity

Entity definition

An abstract entity defining common information about a type of swept area solid which is the result of sweeping an area along a Directrix. The swept area is provided by a subtype of IfcProfileDef. The profile is placed by an implicit cartesian transformation operator at the start point of the sweep. The profile normal is where the profile normal agrees to the tangent of the directrix at this point. The rule of orientation of profile�s x-axis is specialized by the subtypes of IfcDirextrixDistanceSweptAreaSolid. The start of the sweeping operation is at the StartDistance, provided by IfcDistanceExpression. If no StartDistance is provided the start defaults to the begin of the directrix. The end of the sweeping operation is at the EndDistance, provided by IfcDistanceExpression. If no EndDistance is provided the end defaults to the end of the directrix.

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
3	Directrix	IfcCurve		The curve used to define the sweeping operation. The solid is generated by sweeping the SELF\IfcSweptAreaSolid.SweptArea along the Directrix.	X
4	StartDistance	IfcDistanceExpression	?	Distance expressions indicating the position where the sweeping operation starts along the Directrix. If no distance expression provided the start of the sweeping operation is at the start of the Directrix.	X
5	EndDistance	IfcDistanceExpression	?	Distance expressions indicating the position where the sweeping operation ends along the Directrix. If no distance expression provided the end of the sweeping operation is at the end of the Directrix.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcRepresentationItem
	LayerAssignment	IfcPresentationLayerAssignment @AssignedItems	S[0:1]	Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items. IFC2x3 CHANGE The inverse attribute LayerAssignments has been added. IFC4 CHANGE The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.	X
	StyledByItem	IfcStyledItem @Item	S[0:1]	Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve. IFC2x3 CHANGE The inverse attribute StyledByItem has been added.	X
IfcGeometricRepresentationItem
IfcSolidModel
	Dim :=3	IfcDimensionCount		The space dimensionality of this class, it is always 3.	X
IfcSweptAreaSolid
1	SweptArea	IfcProfileDef		The surface defining the area to be swept. It is given as a profile definition within the xy plane of the position coordinate system.	X
2	Position	IfcAxis2Placement3D	?	Position coordinate system for the resulting swept solid of the sweeping operation. The position coordinate system allows for re-positioning of the swept solid. If not provided, the swept solid remains within the position as determined by the cross section or by the directrix used for the sweeping operation. IFC4 CHANGE The attribute has been changed to OPTIONAL with upward compatibility for file-based exchange.	X
IfcDirectrixDistanceSweptAreaSolid
3	Directrix	IfcCurve		The curve used to define the sweeping operation. The solid is generated by sweeping the SELF\IfcSweptAreaSolid.SweptArea along the Directrix.	X
4	StartDistance	IfcDistanceExpression	?	Distance expressions indicating the position where the sweeping operation starts along the Directrix. If no distance expression provided the start of the sweeping operation is at the start of the Directrix.	X
5	EndDistance	IfcDistanceExpression	?	Distance expressions indicating the position where the sweeping operation ends along the Directrix. If no distance expression provided the end of the sweeping operation is at the end of the Directrix.	X

Formal representations

XML Specification

 <xs:element name="IfcDirectrixDistanceSweptAreaSolid" type="ifc:IfcDirectrixDistanceSweptAreaSolid" abstract="true" substitutionGroup="ifc:IfcSweptAreaSolid" nillable="true"/>

 <xs:complexType name="IfcDirectrixDistanceSweptAreaSolid" abstract="true">

  <xs:complexContent>

   <xs:extension base="ifc:IfcSweptAreaSolid">

    <xs:sequence>

     <xs:element name="Directrix" type="ifc:IfcCurve" nillable="true"/>

     <xs:element name="StartDistance" type="ifc:IfcDistanceExpression" nillable="true" minOccurs="0"/>

     <xs:element name="EndDistance" type="ifc:IfcDistanceExpression" nillable="true" minOccurs="0"/>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcDirectrixDistanceSweptAreaSolid

 ABSTRACT SUPERTYPE OF(IfcInclinedReferenceSweptAreaSolid)

 SUBTYPE OF (IfcSweptAreaSolid);

  Directrix : IfcCurve;

  StartDistance : OPTIONAL IfcDistanceExpression;

  EndDistance : OPTIONAL IfcDistanceExpression;

END_ENTITY;

 EXPRESS-G diagram