message listCategoriesResponse
parts 
response
element business:listCategoriesResponse
used by 
Operation listCategories in PortType BusinessService
source 
<wsdl:message name="listCategoriesResponse">
  <wsdl:part name="response" element="business:listCategoriesResponse"/>
</wsdl:message>

WSDL documentation generated by XMLSpy WSDL Editor http://www.altova.com/xmlspy