SOAP and WSDL are supported in the Remoting package
(see http://www.appinf.com/poco/wiki/tiki-index.php?page=Remoting).
It allows you to generate a WSDL description for a RemoteObject, a C# client can then use this file to successfully communicate with a poco server.
In addition to SOAP we currently support NetConf and a fast (proprietary) binary protocol
