message listMigrationRulesResponse
parts 
params
element pm:migrationRuleList
used by 
Operation listMigrationRules in PortType processManagement
source  
<wsdl:message name="listMigrationRulesResponse">
  <wsdl:part name="params" element="pm:migrationRuleList"/>
</wsdl:message>

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