
  extension if there is a corresponding <a href="WebServiceFeature.html" title="class in jakarta.xml.ws"><code>WebServiceFeature</code></a> or annotation.
  Similarly, a web service client can disable
  particular extension using the corresponding <code>WebServiceFeature</code> while
  creating a proxy or Dispatch instance.
  The runtime MUST also make sure that binding of
  SEI parameters/return values respect the <code>wsdl:binding</code>.
  With this feature enabled, if a required (<code>wsdl:required="