Returns a new XYZ whose coordinates are the normalized values from this vector. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Return Value
The normalized XYZ or zero if the vector is almost Zero.Remarks
 Normalized indicates that the length of this vector equals one (a unit vector).