|LayerAssignment||SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems||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.
|StyledByItem||SET [0:1] OF IfcStyledItem FOR Item||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.
|Dim||INVALID||The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve.|
|2||CoefficientsX||OPTIONAL LIST [2:?] OF IfcReal|
|3||CoefficientsY||OPTIONAL LIST [2:?] OF IfcReal|
ENTITY IfcPolynomialCurve SUBTYPE OF (IfcCurve); Position : IfcPlacement; CoefficientsX : OPTIONAL LIST [2:?] OF IfcReal; CoefficientsY : OPTIONAL LIST [2:?] OF IfcReal; CoefficentsZ : OPTIONAL LIST [2:?] OF IfcReal; END_ENTITY;