message scheduleWorkItemRequest
parts 
scheduleWorkItemDoc
element dto:scheduleWorkItem
used by 
Operation scheduleWorkItem in PortType WorkItemSchedulerService
source  
<wsdl:message name="scheduleWorkItemRequest">
  <wsdl:part name="scheduleWorkItemDoc" element="dto:scheduleWorkItem"/>
</wsdl:message>

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