message openNextWorkItemRequest
parts 
request
element dto:baseRequest
used by 
Operation openNextWorkItem in PortType WorkPresentationService
source  
<wsdl:message name="openNextWorkItemRequest">
  <wsdl:part name="request" element="dto:baseRequest"/>
</wsdl:message>

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