Remote WS calls can be executed using a single parameter ( wrapping all input into a single object ) or sending individual objects.
See reference in:

• https://cxf.apache.org/docs/wsdl-to-java.html
• https://cxf.apache.org/docs/http-binding.html

So the request here is that WS Handler allows to work with both methods, depending on the configuration, users can send parameters either way, wrapped or not.