The switch node is a proxy-node that uses the value of its topic-node to select an evaluation path based on evaluation of its argument list.

• Minimum number of child-nodes: 0

• Maximum number of child-nodes: no limit

1. If the topic-node has no data then the switch node's value = 0 (undetermined)
2. Otherwise:
   1. Arguments are evaluated in sequence
   2. The chosen argument is the first true argument in the argument list
   3. The chosen child-node is the n^th node where n is the index of the chosen argument
   4. If there are no true arguments and there are more child-nodes than arguments then the chosen child-node is the (n+1)^th child-node where n is the argument count.
   5. If there is a chosen child-node then the value of the chosen child-node is passed as the value of the switch node
   6. Otherwise the value of the switch node = 0 (undetermined)