Attribute "action" missing or wrong XML structure

Question

Does anyone know what's the problem of below XML format ?   I want to triggle a stored procedure in AS/400 from SAPXI after receiving records.  But the message "No 'action' attribute found in XML document (attribute "action" missing or wrong XML structure)" is found
<?xml version="1.0" encoding="UTF-8"?>
<ns0:MT_t1 xmlns:ns0="http://cxx.xxx.hk/zxxxpxx/jdbc">
   <storedProcedurename>
      <action>EXECUTE</action>
      <table>LIBRARY.PROCNAME</table>
      <TRNX_TYPE IsInput="true" TYPE="CHAR">content 1</TRNX_TYPE>
      <TRNX_NO IsInput="true" TYPE="CHAR">content 2</TRNX_NO>
   </storedProcedurename>
</ns0:MT_t1>

Answer 1

Dear all,
Thanks for your help and now I can submit a stored procedure via SAP XI by using below XML format.  I try to define two output parameters at the end of this XML. How to get the return value ? Should I define a response message type ? and what is the XML format ?
<?xml version="1.0" encoding="UTF-8"?>
<ns0:MT_SYN_t1 xmlns:ns0="http://xxx.xxu.hk/zxxxpgs/jdbc">
   <update>
      <storedProcedurename action="EXECUTE">
         <table>LIBRARY.PANSYTEST</table>
         <TRNX_TYPE IsInput="TRUE" TYPE="CHAR">4</TRNX_TYPE>
         <TRNX_NO IsInput="TRUE" TYPE="CHAR">2</TRNX_NO>
         <ACTIN IsInput="TRUE" TYPE="CHAR">23</ACTIN>
         <RCRT_DATM IsInput="TRUE" TYPE="CHAR">3</RCRT_DATM>
         <RCRT_USER IsInput="TRUE" TYPE="CHAR">8</RCRT_USER>
         <STUD_ID IsInput="TRUE" TYPE="CHAR">8</STUD_ID>
         <AWD_SEQ IsInput="TRUE" TYPE="CHAR">6899</AWD_SEQ>
         <AW_PSDATE IsInput="TRUE" TYPE="CHAR">89</AW_PSDATE>
         <AW_PEDATE IsInput="TRUE" TYPE="CHAR">99</AW_PEDATE>
         <OUT_TRNX_TYPE IsOutput="TRUE" TYPE="CHAR">4</OUT_TRNX_TYPE>
         <OUT_TRNX_NO IsOutput="TRUE" TYPE="CHAR">2</OUT_TRNX_NO>
      </storedProcedurename>
   </update>
</ns0:MT_SYN_t1>