Tree::Persist::File::XML is a handler for Tree persistence.
This class requires no additional parameters than are specified by its parent, Tree::Persist::File.
The XML used is very simple. Each element is called "node". The node contains two attributes - "class", which represents the Tree class to build this node for, and "value", which is the serialized value contained in the node (as retrieved by the value() method.) Parent-child relationships are represented by the parent containing the child.
NOTE: This plugin will currently only handle values that are strings or have a stringification method.