IfcOrientationExpression

Item	SPF	XML	Change	Description
IFC4x1 Release Candidate 3
IfcOrientationExpression			ADDED

Semantic definitions at the entity

Entity definition

An IfcOrientationExpression encapsulates horizontal and vertical directions for describing linear placement.

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
1	LateralAxisDirection	IfcDirection		Direction of the lateral axis.	X
2	VerticalAxisDirection	IfcDirection		Direction of the vertical axis.	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
IfcOrientationExpression
1	LateralAxisDirection	IfcDirection		Direction of the lateral axis.	X
2	VerticalAxisDirection	IfcDirection		Direction of the vertical axis.	X

Formal representations

XML Specification

 <xs:element name="IfcOrientationExpression" type="ifc:IfcOrientationExpression" substitutionGroup="ifc:IfcGeometricRepresentationItem" nillable="true"/>

 <xs:complexType name="IfcOrientationExpression">

  <xs:complexContent>

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

    <xs:sequence>

     <xs:element name="LateralAxisDirection" type="ifc:IfcDirection" nillable="true"/>

     <xs:element name="VerticalAxisDirection" type="ifc:IfcDirection" nillable="true"/>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcOrientationExpression

 SUBTYPE OF (IfcGeometricRepresentationItem);

  LateralAxisDirection : IfcDirection;

  VerticalAxisDirection : IfcDirection;

END_ENTITY;

 EXPRESS-G diagram