This is the most common message style (and is the default message style for InterSystems IRIS web services).
<SOAP-ENV:Envelope xmlns:SOAP-ENV='https://schemas.xmlsoap.org/soap/envelope/'
xmlns:xsi='https://www.w3.org/2001/XMLSchema-instance'
xmlns:s='https://www.w3.org/2001/XMLSchema'>
<SOAP-ENV:Body>
<MyMethod xmlns="https://www.demoservice.org">
<A>stringA</A>
<B>stringB</B>
<C>stringC</C>
</MyMethod>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
