Prefixing arguments with namespaces (without WSDL)

I am using PEAR SOAP 0.8RC2. The following WSDL-based code works great (I get a response from the server indicating that yes, Lorne Greene is dead.) $wsdl = new SOAP_WSDL('http://www.abundanttech.com/webservices/deadoralive/deadoralive.w sdl'); $client = $wsdl->getProxy(); $ret = $client->getDeadOrAlive('Lorne Greene'); The following non-WSDL-based code doesn't work (I get back an empty envelope) $client = new SOAP_Client('http://www.abundanttech.com/webservices/deadoralive/deadoralive .asmx'); $options = array('namespace' => 'http://www.abundanttech.com/webservices/deadoralive', 'soapaction' => 'http://www.abundanttech.com/webservices/deadoralive/getDeadOrAlive'); $args = array('sFullName' => 'Lorne Greene'); $ret = $client->call('getDeadOrAlive', $args, $options); Both the WSDL and non-WSDL versions include the app-specific namespace in the envelope with an attribute like this: xmlns:ns4="http://www.abundanttech.com/webservices/deadoralive" inside the <SOAP-ENV:Envelope> tag. The crucial difference seems to be that the WSDL version correctly includes a namespace for the argument to the method, while the non-WSDL version doesn't. The WSDL version sends this as the body of the envelope: <SOAP-ENV:Body> <ns4:getDeadOrAlive> <ns4:sFullName>Lorne Greene</ns4:sFullName></ns4:getDeadOrAlive> </SOAP-ENV:Body> The non-WSDL version sends this body: <SOAP-ENV:Body> <ns4:getDeadOrAlive> <sFullName xsi:type="xsd:string">Lorne Greene</sFullName></ns4:getDeadOrAlive> </SOAP-ENV:Body> If I specify "ns4:sFullName" as the name of the argument instead of just "sFullName" in the non-WSDL version, then I get back a successful response just like in the WSDL version. But I only know that ns4 is the right namespace from examining the wire output from unsucessful requests, so this isn't really a scalable or pretty way to do it. In circumstances where I can't use WSDL, how can I make sure that the correct namespace prefix is prepended to my argument names? Thanks, David