IfcElementarySurface

Natural language names
elementare Fläche
Elementary Surface
Surface élémentaire
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
#AttributeTypeCardinalityDescription G
1PositionIfcAxis2Placement3D 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 IfcCylindricalSurface IfcPlane IfcSphericalSurface IfcToroidalSurface IfcSurface 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
IfcSurface
Dim
:=3
IfcDimensionCountThe space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item.
IFC4 CHANGE Derived attribute promoted from subtypes.
X
IfcElementarySurface
1PositionIfcAxis2Placement3D 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;

Link to EXPRESS-G diagram EXPRESS-G diagram

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