8.6.1 Format
<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
<!DOCTYPE COMMAND_LIST SYSTEM "espcommand.dtd">
<COMMAND_LIST>
<ESP_NAME/>
<COMMAND>
<USER_COMMAND_ID>user-defined-service-ID</USER_COMMAND_ID>
<USER_COMMAND>user-defined-command</USER_COMMAND>
<EXECUTION_TIME></EXECUTION_TIME>
</COMMAND>
...
</COMMAND_LIST>