HP Integrated Lights-Out User Manual page 260

260 User Guide Integrated Lights-Out
PERL scripts must send the XML header before sending the body of the
script.
PERL scripts must provide script data fast enough to prevent the device from
timing out.
XML scripts cannot contain the update firmware command, which requires
extra work on the part of the PERL script to open the file containing the
firmware image and send it to the device.
Only one XML document is allowed per connection, which means one pair
of RIBCL tags.
The device will not accept additional XML tags after a syntax error occurs.
To send additional XML, a new connection must be established.