<wsdl:message name="someMessageRequest">
    <wsdl:part name="parameters" element="ns0:someMessageRequest"/>
</wsdl:message>
<wsdl:message name="someMessageResponse">
    <wsdl:part name="parameters" element="ns0:someMessageResponse"/>
</wsdl:message>

... SNIP ...

<soap:operation style="document" soapAction="someMessage"/>
<wsdl:input>
     <soap:body use="literal" parts="parameters"/>
</wsdl:input>
<wsdl:output>
     <soap:body use="literal" parts="parameters"/>
</wsdl:output>

<wsdl:message name="someMessageRequest">
    <wsdl:part name="parametersRequest" element="ns0:someMessageRequest"/>
</wsdl:message>
<wsdl:message name="someMessageResponse">
    <wsdl:part name="parametersResponse" element="ns0:someMessageResponse"/>
</wsdl:message>

... SNIP ...

<soap:operation style="document" soapAction="someMessage"/>
<wsdl:input>
     <soap:body use="literal" parts="parametersRequest"/>
</wsdl:input>
<wsdl:output>
     <soap:body use="literal" parts="parametersResponse"/>
</wsdl:output>