Hi Nimrod
This discussion has peaked my interest in MPTT implementations. I am working on an object system for a CMS based on CakePHP and the object tree is implemented using MPTT. I did a "textbook" implementation of the thing, which means using a recursive algorithm to reorder the tree traversal data (lft and rgt) for each tree node in for inserts and deletes.
Tree traversal methods are not in my area of expertise unfortunately (I am better at using the tools given to me), so excuse me if I can't add much to this sub thread. I am however very interested to hear what you have to say on the subject :-)
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