The tree::simple::visitorfactory module contains a number of visitor objects which can perform various tasks on tree::simple objects.

the following visitors are included:
* pathtoroot: find the path back to the tree's root node
* findbypath: find the node specified by a path
* findbyuid: find the node with the same uid
* findbynodevalue: find the node with the same node value
* breadthfirsttraversal: implements a breadth-first traversal
* postordertraversal: implements a post-order traversal
* preordertraversal: implements a pre-order traversal
* loaddirectorytree: load a directory tree into a tree::simple hierarchy
* createdirectorytree: create a set of directories and files from a
tree::simple hierarchy
* fromnestedarray: create a tree::simple hierarchy from nested arrays
* tonestedarray: create a nested array construct from a tree::simple hierarchy
* tree::simple::visitor::variabledepthclone: clone parts of tree hierarchies
* fromnestedhash: create a tree::simple hierarchy from nested hashes
* tonestedhash: create a nested hash construct from a tree::simple hierarchy
* loadclasshierarchy: create a tree::simple hierarchy which models the classes
inheritance heirarchy
* getalldescendents: return all the descendents recursively on down the
hierarchy
* sort: implements a multi-level sort of a tree::simple heirarchy