To be do ST

Barack Obama   Sat Apr 24, 2010 5:51 pm GMT
"You are to take Hu Jin Tao to the USA"

what does it mean?
Guessed   Sat Apr 24, 2010 7:28 pm GMT
It is used to indicate that someone is supposed to do something.
Example   Sat Apr 24, 2010 10:26 pm GMT
You're to stop fucking around and start leading your country adequately , Obama.