Definition of IAI: The railing (IfcRailing) is a frame
assembly adjacent to human circulation spaces and at some space boundaries
where in lieu of walls or to compliment walls. Designed to aid humans, either
as an optional physical support, or to prevent injury by falling. A list of
references to accessory/mounting hardware for this railing might be given by
including these assessories (IfcAssessory) through the objectified
relationship IfcRelAggregates.
HISTORY New Entity in IFC Release 2.0
Geometry Use Definitions
The geometric representation of IfcRailing is given by the
IfcProductDefinitionShape, allowing multiple geometric representation.
Included are:
Local placement
The local placement for IfcRailing is defined in its supertype
IfcProduct. It is defined by the IfcLocalPlacement, which defines
the local coordinate system that is referenced by all geometric
representations.
- The PlacementRelTo relationship of IfcLocalPlacement shall point (if
given) to the same IfcSpatialStructureElement , which is used in the
ContainedInStructure inverse attribute, or to a spatial structure element at a
higher level, referenced by that.
- If the IfcRailing, however, is used by an IfcStair or IfcRamp, and
this container class defines its own local placement, than the PlacementRelTo
relationship of IfcLocalPlacement shall point (if given) to the local placement
of the aggregate.
- If the relative placement is not used, the absolute placement is
defined within the world coordinate system.
Geometric Representation
The BoundingBox, the SurfaceModel and the Brep geometric representation
of IfcRailing is defined at the supertype IfcBuildingElement.
