PEARtree

Salut everybody , I am working on a project which implements an online version of some Yellow Pages. We have addresses of companies which are assigned to business sectors. The business sectors in turn are arranged in a tree structure. More generally spoken, the business sectors are nodes of a tree and the addresses (or any other information objects with properties) the leaves. This is why I consider implementing a library for maintaining such hierarchical information trees. It shall be PEAR compliant (not only because it then might qualify for a really nice name: PEARtree :) The idea is this: 3 main classes: Tree, Tree_node and Tree_leaf - each extending DB_storage. Tree will take care of all modifying/adding/deleting of Tree_node and Tree_leaf objects which belong to this particular tree. Perhaps such a library already exists? If so it would be very nice if you could tell me the name of it. An example I know is the library from Ratschiller/Gerken: "Web Application Development with PHP 4.0" Any comments are very appreciated. Yours Jens Wolk -- Jens Wolk Torfstrasse 19 D-13353 Berlin +49 (030) 440 173 18 +49 (030) 440 173 19