Kubla Khan represents an individual misdirected by his passions, urges, temptations, commits massacre and bloodshed for expansion of his empire.
It's clairvoyance or insight powerful enough to stand juxtapose Kubla Khan , the prominent and powerful ruler of Mongol Dynasty .
Xanadu is abmigous. It's a state of trance or meditation or the throne. One leads to inner conscience, intuition and clairvoyance while the other to autocratic or tyranny ruling.
It's austerity or penance. Its mentality at which noble deeds are performed therefore , it is holy but it demands sacrifice
The term milk of paradise is divine pleasure which is felt just after an act in benevolence is done.
Poets are clairvoyant people who only can feel different than the worldly in their trance , they observe and watch .