A utility class containing functions related to external resource references. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2015 
Syntax
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Remarks
 Elements which are external resource references refer to data outside of the base .rvt file.