message listCalendarsRequest
parts 
parameters
element workcal:listCalendars
used by 
Operation listCalendars in PortType WorkCalService
source 
<wsdl:message name="listCalendarsRequest">
  <wsdl:part name="parameters" element="workcal:listCalendars"/>
</wsdl:message>

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