Natural language names
Ebene Fläche
Semantic definitions at the entity
Entity definition

The planar surface is an unbounded surface in the direction of x and y. Bounded planar surfaces are defined by using a subtype of IfcBoundedSurface with BasisSurface being a plane.

NOTE  Definition according to ISO/CD 10303-42:1992
A plane is an unbounded surface with a constant normal. A plane is defined by a point on the plane and the normal direction to the plane. The data is to be interpreted as follows:
   C = Position.Location
   x = Position.P[1]
   y = Position.P[2]
   z = Position.P[3] => normal to plane
and the surface is parameterized as:
where the parametric range is -∞ < u,v < ∞. In the above parameterization the length unit for the unit vectors x and y is derived from the context of the plane.
NOTE  A rectangular bounded planar surface can be defined by an IfcRectangularTrimmedSurface with BasisSurface being the plane and U1 = left bound in x, U2 = right bound in x, V1 = lower bound in y, V2 = upper bound in y if viewed into the direction of the negative normal. (assuming the Usense and Vsense agree to the sense of the basis surface).

The inherited attributes are interpreted as

NOTE  Entity adapted from plane in ISO 10303-42.
HISTORY  New entity in IFC1.5
Inherited definitions from supertypes
Entity inheritance IfcElementarySurface IfcSurface IfcGeometricRepresentationItem IfcRepresentationItem
Attribute inheritance
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.
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.
IfcDimensionCountThe space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item.
IFC4 CHANGE Derived attribute promoted from subtypes.
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="IfcPlane" type="ifc:IfcPlane" substitutionGroup="ifc:IfcElementarySurface" nillable="true"/>
 <xs:complexType name="IfcPlane">
   <xs:extension base="ifc:IfcElementarySurface"/>
EXPRESS Specification
 SUBTYPE OF (IfcElementarySurface);

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcCurveBoundedPlane

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