code: def register_classes():
      
      CopyBaseROI.register_class()
      CopyBaseROI_SG.register_class()
      SimulateROI.register_class()
      SimulateROI_SG.register_class()
      RandomDirGen.register_class()
      RandomDirGen_SG.register_class()
docs: Register these classes with the `LinkFactory`