| Beam.Type | 
 Represents the different types of beams. 
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| Covering.Type | 
 Represents the different types of coverings. 
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| Door | 
 Door entity represents doors in IFC models. 
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| Door.OperationType | 
 Describes the opening operation and direction of a door. 
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| Door.OperationType.OpeningSide | 
 Defines the opening side of a door when the door is viewed in the reference direction. 
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| Flight | 
 The Flight interface provides geometric information about the flight element shape. 
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| Handrail | 
Represents a handrail that can be a part of a  Flight in stairs or ramps.  
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| Handrail.Side | 
 Defines the side of the flight on which the handrail is located. 
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| Opening | 
 Opening entity represents openings in IFC models (IfcOpeningElement). 
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| RampElement | 
 Represents an element that occurs as a part of ramp, for example, a flight or a landing. 
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| RampFlight | 
 The RampFlight interface provides geometric information about the ramp flight shape. 
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| Space | 
 Door entity represents spaces in IFC models (IfcSpace). 
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| SpaceBoundary | 
The  SpaceBoundary interface provides information about the space boundary.  
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| SpaceBoundary.Type | 
 The type of the space boundary. 
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| StairElement | 
 The StairElement interface provides geometric information about the stair element shape. 
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| StairFlight | 
 The StairFlight interface provides geometric information about the stair flight shape. 
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| StairStep | 
 The StairStep interface provides 2D geometric information about the top stair step shape. 
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| Window | 
 Window entity represents windows in IFC models (IfcWindow). 
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