The reference types permitted for a number system to refer to the geometry of a stairs run. 
   Namespace:   Autodesk.Revit.DB.Architecture  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
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Members
| Member name | Description | 
|---|---|
| Center | The number system reference to stairs path. | 
| Left | The number system reference to left boundary of stairs. | 
| Right | The number system reference to right boundary of stairs. | 
| LeftQuarter | The number system reference to left quarter of stairs | 
| RightQuarter | The number system reference to right quarter of stairs |