IfcElementarySurface

Semantic definitions at the entity

Entity definition

An IfcElementarySurface in the common supertype of analytical surfaces.

NOTE Definition according to ISO/CD 10303-42:1992
An elementary surface (IfcElementarySurface) is a simple analytic surface with defined parametric representation.

NOTE Entity adapted from elementary_surface defined in ISO 10303-42.

HISTORY New entity in IFC1.5

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
1	Position	IfcAxis2Placement3D		The position and orientation of the surface. This attribute is used in the definition of the parameterization of the surface.	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
IfcSurface
	Dim :=3	IfcDimensionCount		The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item. IFC4 CHANGE Derived attribute promoted from subtypes.	X
IfcElementarySurface
1	Position	IfcAxis2Placement3D		The position and orientation of the surface. This attribute is used in the definition of the parameterization of the surface.	X

Formal representations

XML Specification

 <xs:element name="IfcElementarySurface" type="ifc:IfcElementarySurface" abstract="true" substitutionGroup="ifc:IfcSurface" nillable="true"/>

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

  <xs:complexContent>

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

    <xs:sequence>

     <xs:element name="Position" type="ifc:IfcAxis2Placement3D" nillable="true"/>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcElementarySurface

 ABSTRACT SUPERTYPE OF(ONEOF(IfcCylindricalSurface, IfcPlane, IfcSphericalSurface, IfcToroidalSurface))

 SUBTYPE OF (IfcSurface);

  Position : IfcAxis2Placement3D;

END_ENTITY;

 EXPRESS-G diagram

	elementare Fläche
	Elementary Surface
	Surface élémentaire