{{{
<wsstm:StreamSource>
  <wsstm:StreamDescriptions targetNamespace="xs:anyURI" ...>
    <wsstm:streamType name="xs:QName" ...>
      xs:any*
    </wsstm:streamType>+
    xs:any*
  </wsstm:StreamDescriptions>
  xs:any*
</wsstm:StreamSource>
}}}