xml parameter for soap webservice request in iphone

Question

Hello everybody. I want to send a soap request to a webservice method. Now i want to send the parameter as an xml input for that request. so plz can anybody give me an idea of how to do it in iphone? Right now i am sending the request in following way :

NSString *soapMessage =
@"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
"<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope\"&gt;\n"
"<soap:Body>\n"
"<GetCustomerInfoXML xmlns=\"http://qa2.alliancetek.com/phpwebservice\"&gt;\n"
"<id><customer><id>1</id></customer></id>"
"</GetCustomerInfoXML>"
"</soap:Body>\n"
"</soap:Envelope>";
NSLog(@"%@",soapMessage);

NSURL *url = [NSURL URLWithString:@"http://qa2.alliancetek.com/phpwebservice/index.php"];
NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMessage length]];

[theRequest addValue: @"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
[theRequest addValue: @"http://qa2.alliancetek.com/phpwebservice/index.php//GetCustomerInfoXML" forHTTPHeaderField:@"SOAPAction"];
[theRequest addValue: msgLength forHTTPHeaderField:@"Content-Length"];
[theRequest setHTTPMethod:@"POST"];
[theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];

But i want to send the parameters in xml format. so how do i do it????