XML message about terminal upgrade status
<UpgradeTerminalStatus version="2.0" xmlns="http://www.isapi.org/ver20/XMLSchema">
<UpgradeTerminalList><!--required, terminals to be upgraded-->
<UpgradeTerminal><!--required, terminal upgrade-->
<terminalNo><!--required, int, terminal ID--></terminalNo>
<currentStatus><!--required, string, upgrade status: upgrading, failed, "success"-upgraded--></currentStatus>
<percent><!--dependent, int, upgrade progress, range: [0,100], this field is required only when currentStatus> is "upgrading"--></percent>
</UpgradeTerminal>
<UpgradeTerminalList>
</UpgradeTerminalStatus>