Creates a new instance of a set specifically for holding category objects. 
   Namespace:   Autodesk.Revit.Creation  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Return Value
A new instance of a Category Set.Remarks
 This type of set is used during the creation of instance and type bindings.