Determines if this frame's basis vectors are orthonormal. 
   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
True if this frame's basis vectors are orthonormal, false if not.Remarks
 "Orthonormal" means that the three vectors are orthogonal and each of them has unit length.