docs: private static void addProperties(EndpointReferenceType epr, SLProperties props) {
          MetadataType metadata = WSAEndpointReferenceUtils.getSetMetadata(epr);
          ServiceLocatorPropertiesType jaxbProps = SLPropertiesConverter.toServiceLocatorPropertiesType(props);
  
          JAXBElement<ServiceLocatorPropertiesType>
              slp = SL_OBJECT_FACTORY.createServiceLocatorProperties(jaxbProps);
          metadata.getAny().add(slp);
      }