IfcOrientationExpression

Natural language names
Orientation Expression
Change log
ItemSPFXMLChangeDescription
IFC4x1 Final 4.1.0.0
    IfcOrientationExpressionADDED
IFC4x1 Final 4.1.0.0
    IfcOrientationExpressionADDED
Semantic definitions at the entity
Entity definition

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

Attribute definitions
#AttributeTypeCardinalityDescription G
1LateralAxisDirectionIfcDirection Direction of the lateral axis. X
2VerticalAxisDirectionIfcDirection Direction of the vertical axis. X
Inherited definitions from supertypes
Entity inheritance IfcGeometricRepresentationItem IfcRepresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRepresentationItem
LayerAssignmentIfcPresentationLayerAssignment
@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
StyledByItemIfcStyledItem
@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
1LateralAxisDirectionIfcDirection Direction of the lateral axis. X
2VerticalAxisDirectionIfcDirection 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;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcLinearPlacement

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