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

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