Defines the requirements for a tree node object that can change -- by adding or removing child nodes, or by changing the contents of a user object stored in the node. (inspired by javax.swing.tree.MutableTreeNode).
@author
Oliver Rossmueller
@version $Revision: 472638 $ $Date: 2006-11-08 21:54:13 +0100 (Mi, 08 Nov 2006) $