This article is talking about the web service client.

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Firstly the SOAP message model:

?then, the message sample,

    <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 <soapenv:Body>
  <tns:scheduleRequest xmlns:tns="http://webservice.oo.oo.oo.com">
   <identifier>DSWINV1</identifier>
   <action>SET</action>
   <startDate>TODAY</startDate>
   <startTime>NOW</startTime>
   <interval>600</interval>
   <count>10</count>
   <ignoreMissed>TRUE</ignoreMissed>
   <allowOverwrite>TRUE</allowOverwrite>
  </tns:scheduleRequest>
 </soapenv:Body>
</soapenv:Envelope>
  

?next, the sample code of sending a message,

    public void sendMessage(Message message) throws MalformedURLException,
			SOAPException {
		URL endPoint = new URL(url + serviceName);
		SOAPConnectionFactory soapConnFactory = SOAPConnectionFactory.newInstance();
		SOAPConnection connection = soapConnFactory.createConnection();
		MessageFactory messageFactory = MessageFactory.newInstance();
		// create soap message
		SOAPMessage message = messageFactory.createMessage();
		MimeHeaders mh = message.getMimeHeaders();
		mh.addHeader("SOAPAction", "schedule");
		
		SOAPPart soapPart = message.getSOAPPart();
		SOAPEnvelope envelope = soapPart.getEnvelope();
		SOAPBody body = envelope.getBody();
		SOAPElement requestElement = body.addChildElement("scheduleRequest", NS_PREFIX,
				TARGET_NAMESPACE);
		SOAPElement identifierElement = requestElement.addChildElement("identifier", null);
		identifierElement.addTextNode(schedule.getIdentifier());
		SOAPElement actionElement = requestElement.addChildElement("action", null);
		actionElement.addTextNode(schedule.getAction());	
		SOAPElement startDateElement = requestElement.addChildElement("startDate", null);
		startDateElement.addTextNode(schedule.getStartDate());
		SOAPElement startTimeElement = requestElement.addChildElement("startTime", null);
		startTimeElement.addTextNode(schedule.getStartTime());
		SOAPElement intervalElement = requestElement.addChildElement("interval", null);
		intervalElement.addTextNode(String.valueOf(schedule.getInterval()));
		SOAPElement countElement = requestElement.addChildElement("count", null);
		countElement.addTextNode(String.valueOf(schedule.getCount()));
		SOAPElement ignoreMissedElement = requestElement.addChildElement("ignoreMissed", null);
		ignoreMissedElement.addTextNode(schedule.getIgnoreMissed());
		SOAPElement allowOverwriteElement = requestElement.addChildElement("allowOverwrite", null);
		allowOverwriteElement.addTextNode(schedule.getAllowOverwrite());
		message.saveChanges();
		try {
			message.writeTo(System.out);
		} catch (IOException e) {
			e.printStackTrace();
		}
		SOAPMessage reply = connection.call(message, endPoint);
		try {
			if(reply!=null) reply.writeTo(System.out);
		} catch (IOException e) {
			e.printStackTrace();
		}
		connection.close();
	}
  

Web service client