docs: public void marshall(SynthesizeSpeechRequest synthesizeSpeechRequest, ProtocolMarshaller protocolMarshaller) {
  
          if (synthesizeSpeechRequest == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(synthesizeSpeechRequest.getLexiconNames(), LEXICONNAMES_BINDING);
              protocolMarshaller.marshall(synthesizeSpeechRequest.getOutputFormat(), OUTPUTFORMAT_BINDING);
              protocolMarshaller.marshall(synthesizeSpeechRequest.getSampleRate(), SAMPLERATE_BINDING);
              protocolMarshaller.marshall(synthesizeSpeechRequest.getSpeechMarkTypes(), SPEECHMARKTYPES_BINDING);
              protocolMarshaller.marshall(synthesizeSpeechRequest.getText(), TEXT_BINDING);
              protocolMarshaller.marshall(synthesizeSpeechRequest.getTextType(), TEXTTYPE_BINDING);
              protocolMarshaller.marshall(synthesizeSpeechRequest.getVoiceId(), VOICEID_BINDING);
              protocolMarshaller.marshall(synthesizeSpeechRequest.getLanguageCode(), LANGUAGECODE_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }