The base interface for data classes used when executing servers of external services. 
   Namespace:   Autodesk.Revit.DB.ExternalService  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
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Remarks
 Each and every external service defines a concrete class derived from this interface and adds data and methods as it sees fit for executions of such a particular service.