Model class for the tree component. It provides random access to nodes in a tree made up of instances of the {@link TreeNode} class.
@author Sean Schofield
@author Hans Bergsten (Some code taken from an example in his O'Reilly JavaServer Faces book. Copied with permission)
@version $Revision: 168205 $ $Date: 2005-05-04 18:59:21 -0400 (Wed, 04 May 2005) $
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