A utility class containing functions related to external file references. 
   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
 Elements which are external file references refer to files outside of the base .rvt file. Examples include Revit links, CAD links, the element which stores the location of the keynote file, and rendering decals.