message getOrgModelRootsResponse
parts 
response
element om:getOrgModelRootsResponse
used by 
Operation getOrgModelRoots in PortType OrgModelService
source  
<wsdl:message name="getOrgModelRootsResponse">
  <wsdl:part name="response" element="om:getOrgModelRootsResponse"/>
</wsdl:message>

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