Example message

<soap:Envelope
    xmlns:soap="http://www.w3.org/2003/05/soap-envelope"      
    xmlns:wsa="http://www.w3.org/2005/03/addressing">
  <soap:Header>
    <wsa:To>
      http://example.com/fabrikam/Purchasing
    </wsa:To>
    <wsa:Action>
      http://example.com/fabrikam/SubmitPO
    </wsa:Action>
    <wsa:MessageID>
      http://example.com/6B29FC40-CA47-1067
    </wsa:MessageID>
    <wsa:RelatesTo
        RelationshipType="http://www.w3.org/2005/03/addressing/reply">
      http://example.com/fabrikam/mid/1234
    </wsa:RelatesTo>
    <wsa:ReplyTo>
      <wsa:Address>
        mailto:client1@example.com
      </wsa:Address>
    </wsa:ReplyTo>
  </soap:Header>
  <soap:Body>
    …
  </soap:Body>
</soap:Envelope>