IFC 4.3.x development IfcPlanarExtent Semantic definitions at the entity

The planar extent defines the extent along the two axes of the two-dimensional coordinate system, independently of its position. If the planar extent is used within a three-dimensional coordinate system, it defines the extent along the x and y axes.

NOTE  Entity adapted from planar_extent defined in ISO10303-46

HISTORY  New entity in IFC2x2. Attributes

# Attribute Type Description
LayerAssignmentSET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItemsAssignment 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.
1 SizeInX IfcLengthMeasure The extent in the direction of the x-axis.
2 SizeInY IfcLengthMeasure The extent in the direction of the y-axis. Entity inheritance

dot_inheritance IfcPlanarBox IfcPlanarBox IfcPlanarExtent IfcPlanarExtent IfcPlanarBox->IfcPlanarExtent IfcGeometricRepresentationItem IfcGeometricRepresentationItem IfcPlanarExtent->IfcGeometricRepresentationItem IfcGeometricRepresentationItem_children 24 more... IfcGeometricRepresentationItem_children->IfcGeometricRepresentationItem IfcRepresentationItem IfcRepresentationItem IfcGeometricRepresentationItem->IfcRepresentationItem IfcRepresentationItem_children 3 more... IfcRepresentationItem_children->IfcRepresentationItem Formal representations

ENTITY IfcPlanarExtent
 SUBTYPE OF (IfcGeometricRepresentationItem);
	SizeInX : IfcLengthMeasure;
	SizeInY : IfcLengthMeasure;