code: public void marshall(ParameterMetadata parameterMetadata, ProtocolMarshaller protocolMarshaller) {
  
          if (parameterMetadata == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(parameterMetadata.getName(), NAME_BINDING);
              protocolMarshaller.marshall(parameterMetadata.getType(), TYPE_BINDING);
              protocolMarshaller.marshall(parameterMetadata.getKeyId(), KEYID_BINDING);
              protocolMarshaller.marshall(parameterMetadata.getLastModifiedDate(), LASTMODIFIEDDATE_BINDING);
              protocolMarshaller.marshall(parameterMetadata.getLastModifiedUser(), LASTMODIFIEDUSER_BINDING);
              protocolMarshaller.marshall(parameterMetadata.getDescription(), DESCRIPTION_BINDING);
              protocolMarshaller.marshall(parameterMetadata.getAllowedPattern(), ALLOWEDPATTERN_BINDING);
              protocolMarshaller.marshall(parameterMetadata.getVersion(), VERSION_BINDING);
              protocolMarshaller.marshall(parameterMetadata.getTier(), TIER_BINDING);
              protocolMarshaller.marshall(parameterMetadata.getPolicies(), POLICIES_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }
docs: Marshall the given parameter object.