docs: public void marshall(RelationalDatabaseBlueprint relationalDatabaseBlueprint, ProtocolMarshaller protocolMarshaller) {
  
          if (relationalDatabaseBlueprint == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(relationalDatabaseBlueprint.getBlueprintId(), BLUEPRINTID_BINDING);
              protocolMarshaller.marshall(relationalDatabaseBlueprint.getEngine(), ENGINE_BINDING);
              protocolMarshaller.marshall(relationalDatabaseBlueprint.getEngineVersion(), ENGINEVERSION_BINDING);
              protocolMarshaller.marshall(relationalDatabaseBlueprint.getEngineDescription(), ENGINEDESCRIPTION_BINDING);
              protocolMarshaller.marshall(relationalDatabaseBlueprint.getEngineVersionDescription(), ENGINEVERSIONDESCRIPTION_BINDING);
              protocolMarshaller.marshall(relationalDatabaseBlueprint.getIsEngineDefault(), ISENGINEDEFAULT_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }