| add_node | Add a 'Node' to a 'Tree' | 
| add_node.Tree | Add a 'Node' to a 'Tree' | 
| as_node | Convert a 'list' into a 'Node' | 
| children | Extract the names of the children of a 'Node' | 
| children.Node | Extract the names of the children of a 'Node' | 
| get_node | Get a 'Node' using it's name from a 'Tree' | 
| get_node.Tree | Get a 'Node' using it's name from a 'Tree' | 
| get_parent | Obtain the 'Node' that is the parent of a given 'Node' in the... | 
| get_parent.Tree | Obtain the 'Node' that is the parent of a given 'Node' in the... | 
| has_parent | Does this 'Node' have a parent in the 'Tree'? | 
| has_parent.Node | Does this 'Node' have a parent in the 'Tree'? | 
| is_empty | Returns true for Trees that don't contain 'Node's | 
| is_empty.Tree | Returns true for Trees that don't contain 'Node's | 
| map_tree | Map a function over the 'Node's in a 'Tree' | 
| node | Construct a 'Node' | 
| nodes | Obtain the 'Node's that are stored in a 'Tree' | 
| nodes.Tree | Obtain the 'Node's that are stored in a 'Tree' | 
| parent_name | parent_name of a node | 
| parent_name.Node | parent_name of a node | 
| tree | Construct an empty 'Tree' | 
| update_node | Update the data that is attached to a 'Node' | 
| update_node.Node | Update the data that is attached to a 'Node' | 
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