Determines whether this Element represents an external file. 
   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 element contains information about some external file, false if it does not.Remarks
 Linked files are references to external files, but imported files are not, as their data is brought wholly into Revit.