IfcBlossCurve

Item	SPF	XML	Change	Description
IFC4.3 RC1 to IFC4.3 RC2
IfcBlossCurve			ADDED

Semantic definitions at the entity

Entity definition

The Bloss curve is a curve definition used in particular in rail transitions. It was proposed by Dr. Ing. Bloss.

It's parametrization is as follows: X coordinate:

Y coordinate:

where Θ is the deflection angle.

Attribute definitions

#	Attribute	Type	G
1	Position	IfcAxis2Placement	X
2	CurveLength	IfcPositiveLengthMeasure	X
3	Radius	IfcPositiveLengthMeasure	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
IfcCurve
	Dim :=IfcCurveDim(SELF)	IfcDimensionCount		The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve.	X
IfcBlossCurve
1	Position	IfcAxis2Placement			X
2	CurveLength	IfcPositiveLengthMeasure			X
3	Radius	IfcPositiveLengthMeasure			X

Formal representations

XML Specification

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

 <xs:complexType name="IfcBlossCurve">

  <xs:complexContent>

   <xs:extension base="ifc:IfcCurve">

    <xs:sequence>

     <xs:element name="Position">

      <xs:complexType>

       <xs:group ref="ifc:IfcAxis2Placement"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

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

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

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcBlossCurve

 SUBTYPE OF (IfcCurve);

  Position : IfcAxis2Placement;

  CurveLength : IfcPositiveLengthMeasure;

  Radius : IfcPositiveLengthMeasure;

END_ENTITY;

 EXPRESS-G diagram