webservice

In webservice scenario (/people/shabarish.vijayakumar/blog/2006/03/23/rfc--xi--webservice--a-complete-walkthrough-part-1) author has created xsd for the soap response,can anybody explain me why it is required?? can't we create the data type with "getDistanceReturn" field directly ?? bcoz from the webservice message we can directly take the response.

Thanks

kumar