The Tree::Nary class implements N-ary trees (trees of data with any number of branches), providing the organizational structure for a tree (collection) of any number of nodes, but knowing nothing about the specific type of node used. It can be used to display hierarchical database entries in an internal application (the NIS netgroup file is an example of such a database). It offers the capability to select nodes on the tree, and attachment points for nodes on the tree. Each attachment point can support multiple child nodes. WWW: http://search.cpan.org/dist/Tree-Nary/