message listOrganizationsRequest
parts 
parameters
element browse:listOrganizations
used by 
Operation listOrganizations in PortType BrowseModelService
source  
<wsdl:message name="listOrganizationsRequest">
  <wsdl:part name="parameters" element="browse:listOrganizations"/>
</wsdl:message>

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