• derived nodes inherit all messages from their base classes
  
• see reset method for default settings
  
• all children must be value nodes
  
• child value nodes of any size can be used
  
• see the value node for more information
  

constructor add

method app

1 if this node has size greater than zero

1.1 for each child node do

1.1.0.1 get the size of the child node
1.1.0.2 for each value in the child node do

1.1.0.2.1 if the element is less than the size of this node then

1.1.0.2.1.1 if the first child, initialize the element value
1.1.0.2.1.2 else, add the child value to the element value