message queryProcessInstanceCountRequest
parts 
params
element pm:queryString
used by 
Operation queryProcessInstanceCount in PortType processManagement
source  
<wsdl:message name="queryProcessInstanceCountRequest">
  <wsdl:part name="params" element="pm:queryString"/>
</wsdl:message>

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