====== Description ======
The equation node is the node that attaches a network representing an equation to a [[calculated data link]].  It is always the topmost node in a [[calculated data link]] network.

====== Constraints ======
  * Minimum number of child-nodes: 1
  * Maximum number of child-nodes: 1

====== Calculus ======
The equation node simply passes the value of its child-node.