<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <invokeWithCallback
      xmlns="http://stax.service.cxf.apache.org/">
      <reader>
        <bleh>foo</bleh>
      </reader>
    </invokeWithCallback>
  </soap:Body>
</soap:Envelope>
