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	C
1	Position	IfcAxis2Placement3D	[1:1]	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	C
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.	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.	X
IfcGeometricRepresentationItem
IfcSurface
	Dim :=3	IfcDimensionCount	[1:1]	The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item.	X
IfcElementarySurface
1	Position	IfcAxis2Placement3D	[1:1]	The position and orientation of the surface. This attribute is used in the definition of the parameterization of the surface.	X

Formal representations

XSD 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))

 SUBTYPE OF (IfcSurface);

  Position : IfcAxis2Placement3D;

END_ENTITY;

 EXPRESS-G diagram

	elementare Fläche
	Elementary Surface
	Surface élémentaire