IfcLinearSpanPlacement

Item	SPF	XML	Change	Description
IFC4.2 to IFC4.3 RC1
IfcLinearSpanPlacement			ADDED
IFC4.3 RC1 to IFC4.3 RC2
IfcLinearSpanPlacement			MODIFIED	Status changed to Deprecated.
PlacementMeasuredAlong			MODIFIED	Status changed to Deprecated.
Distance	X	X	MODIFIED	Status changed to Deprecated. Type changed from IfcDistanceExpression to IfcPointByDistanceExpression.
RelativePlacement	X	X	MODIFIED	Name changed from Orientation to RelativePlacement. Type changed from IfcOrientationExpression to IfcAxis2PlacementLinear. Instantiation changed from OPTIONAL.

Semantic definitions at the entity

Entity definition

A kind of linear placement that places an object along a linear section of a curve from Distance to Distance + Span.

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
6	Span	IfcPositiveLengthMeasure		The length of the span.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcObjectPlacement
1	PlacementRelTo	IfcObjectPlacement	?	Reference to object placement that provides the relative placement with its placement in a grid, local coordinate system or linear referenced placement. If it is omitted, then in the case of linear placement it is established by the origin of horizontal alignment of the referenced IfcAlignment Axis. In the case of local placement it is established by the geometric representation context.	X
	PlacesObject	IfcProduct @ObjectPlacement	S[0:?]	The IfcObjectPlacement shall be used to provide a placement and an object coordinate system for instances of IfcProduct. If an IfcObjectPlacement is shared by many instances of IfcProduct it does not apply a semantic meaning of being a shared placement that needs to be maintained. The same instance of IfcObjectPlacement could simply be used to reduce exchange file size. IFC2x3 CHANGE New inverse attribute. IFC4 CHANGE The cardinality has changed to 0..n to allow reuse of instances of IfcObjectPlacement as placement object in one to many products. It takes also into account that it can act as a placement for IfcStructuralAnalysisModel.	X
IfcLinearPlacement
2	PlacementMeasuredAlong	IfcCurve			X
3	Distance	IfcPointByDistanceExpression			X
4	RelativePlacement	IfcAxis2PlacementLinear			X
5	CartesianPosition	IfcAxis2Placement3D	?		X
IfcLinearSpanPlacement
6	Span	IfcPositiveLengthMeasure		The length of the span.	X

Formal representations

XML Specification

 <xs:element name="IfcLinearSpanPlacement" type="ifc:IfcLinearSpanPlacement" substitutionGroup="ifc:IfcLinearPlacement" nillable="true"/>

 <xs:complexType name="IfcLinearSpanPlacement">

  <xs:complexContent>

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

    <xs:attribute name="Span" type="ifc:IfcPositiveLengthMeasure" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcLinearSpanPlacement

 SUBTYPE OF (IfcLinearPlacement);

  Span : IfcPositiveLengthMeasure;

END_ENTITY;

 EXPRESS-G diagram