I guess the description in User Guide about Wrapped and Bare document are confusing, and examples are kind of misleading.
For bare document the example is:
@WebMethod public SubmitBareResponse submitPO(SubmitBareRequest poRequest)
public String submitPO(String product, int quantity)
Thanks for the feedback. Please feel free to improve the userguide in that area. Contributions to the WIKI are always welcome...