It seems that image not posted correctly, this is an url
http://pics.livejournal.com/axyd80/pic/c9k0.
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The Composite Pattern, though trivial at first, is quite challenging when it
comes to object/relational mapping and data management. Your best bet is to try
to implement that part first, without much consideration for the UI. The UI
will then be easy to put on top.
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