message deleteReferencesRequest
parts 
parameters
element notification:deleteReferences
used by 
Operation deleteReferences in PortType CalendarRefNotificationService
source 
<wsdl:message name="deleteReferencesRequest">
  <wsdl:part name="parameters" element="notification:deleteReferences"/>
</wsdl:message>

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