message authenticateUserResponse
parts 
response
element security:authenticateUserResponse
used by 
Operation authenticateUser in PortType SecurityService
source  
<wsdl:message name="authenticateUserResponse">
  <wsdl:part name="response" element="security:authenticateUserResponse"/>
</wsdl:message>

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