SOAP Query Method Greater Than

Hi all
Anybody Knows how to indicate in SOAP query method a filter greater than. For example in ITM object do a query where ITMREF > "50000". How ishould be specified in:


<objectKeys xsi:type="wss:ArrayOfCAdxParamKeyValue">
<keys>


<key>ITMREF</key>
<value>???????????</value>


</keys>
</objectKeys>