What is the function of "staff"?

MiaoXiYong in "the general was buried by the wing, pour the rod," said: "pour rod, was buried at set point put the final message to method also."Rod put the coffin, is a key link in geomantic art by angry last, even if have good shape potential, dangchang a mistake, is wasted.Shanhaijing summarized "was buried by the" call "acupuncture point to bury bad, with his", which refers to this.Is set point put the coffin, avoid injury of arteries and veins, away from the arteries and veins, dry wet depth not bian, low depth is measured from the breach, otherwise not only there is no target, and there is also fierce.