3.3.5.1.2 Sending a Printer Set XPS Mode Message

If the client printer supports XPS format, it indicates this support using the RDPDR_PRINTER_ANNOUNCE_FLAG_XPSFORMAT flag when redirecting this printer (see section 2.2.2.1). For these redirected printers, the server can choose to send print job output in XPS format.<3> If the server chooses to send print data in XPS format, the server MUST send this message to the client prior to sending any data in the Printer Write Request (section 2.2.2.9) message.