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<payloadfactory><payloadFactory>
      <format>
           <m:checkpriceresponse xmlns:m="http://services.samples/xsd">
               <m:code>$1</m:code>
               <m:price>$2</m:price>
           </m:checkpriceresponse>
      </format>
      <args>
           <arg expression="//m0:symbol" xmlns:m0="http://services.samples/xsd">
           <arg expression="//m0:last" xmlns:m0="http://services.samples/xsd">
      </arg></arg></args>
</payloadfactory>payloadFactory>

<payloadfactory><payloadFactory>
    <format ../>
	<args>       
		<arg (value="string" | expression=" {xpath} ")/>* 
    </args> 
</payloadfactory>payloadFactory>