An interface for custom handlers of duplicate type names encountered during a paste operation. When the destination document contains types that have the same names as the types being copied, but different internals, a decision must be made on how to proceed - whether to cancel the operation or continue, but only copy types with unique names. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
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