Returns a face that represents the portion of the room face bounded by the boundary element. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
Syntax
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Return Value
The sub-face.Remarks
 If the spatial element's face is adjacent to multiple bounding elements (such as two different walls), there will be one sub-face for each portion of the spatial element's face where it is adjacent to one of those room-bounding elements. This is equivalent to the return of GetRoomFace() if the entire room face is created by the boundary element.