From the following code:

Serializer=CREATEOBJECT('MSSOAP.SoapSerializer')
Connector=CREATEOBJECT('MSSOAP.HTTPConnector')
Reader=CREATEOBJECT('MSSOAP.SoapReader')

Connector.Property("EndPointURL") = "https://..."
Connector.Connect
Connector.Property("SoapAction") = 'http://tempuri.org/...'
Connector.BeginMessage
Serializer.Init(Connector.InputStream)
Serializer.startEnvelope

Serializer.startBody

Serializer.startElement("MyMethod", "http://tempuri.org/...", , "m")

Serializer.startElement('FirstField')
Serializer.writeString('')
Serializer.endElement

Serializer.startElement('SecondField')
Serializer.writeString('')
Serializer.endElement

Serializer.startElement('ThirdField')
Serializer.writeString('')
Serializer.endElement

Serializer.startElement('Username')
Serializer.writeString('something')
Serializer.endElement

Serializer.startElement('Password')
Serializer.writeString('something')
Serializer.endElement

Serializer.startElement('City')
Serializer.writeString('Something')
Serializer.endElement

Serializer.endElement

Serializer.endBody

Serializer.endEnvelope

Connector.EndMessage

The first three parameters are passed by reference. This is a request from the server application. Can someone tell me how in Visual FoxPro I can pass such element by reference?