====== Description ======
The division node returns the quotient of the values of its two child-nodes.

====== Constraints ======
  * Minimum number of child-nodes: 2
  * Maximum number of child-nodes: 2
  * Valid input range: second child-node must be non-zero

====== Calculus ======
The division node's value is the value of its first child-node divided by the value of its second child-node.  If the value of the second node is zero then the node returns ERROR.

<m>value=value_1/value_2 </m>