Represents a coordinate frame of reference. 
   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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Remarks
 A Frame consists of three vectors at a base point in 3D space. The vectors need not be orthogonal, have unit length, or even be linearly independent, although in practice Frames will usually have linearly independent vectors.