docs: public void marshall(CaptionSelector captionSelector, ProtocolMarshaller protocolMarshaller) {
  
          if (captionSelector == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(captionSelector.getLanguageCode(), LANGUAGECODE_BINDING);
              protocolMarshaller.marshall(captionSelector.getName(), NAME_BINDING);
              protocolMarshaller.marshall(captionSelector.getSelectorSettings(), SELECTORSETTINGS_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }