If you use the wsdl for discovery, then you are doing something that's rather dangerous as there are no guarantees what that method does or that it is correct -

If you use the wsdl for discovery, then you are doing something that's rather dangerous as there are no guarantees what that method does or that it is correct -> use documentation instead. If the call is something important (e.g. money transfer) "exploring" rather than knowing is grounds for firing someone.