james at zephyr.org.uk
Thu Dec 31 17:56:42 GMT 2009
ian <londonperlmongers at iandocherty.com> wrote:
> * Every node has a left and a right value and a level
> * For any given node, all of it's descendents left values lie between
>the nodes left and right values.
> * For a leaf node, it's right value equals it's left value + 1
> * All children of a parent will therefore be those with node numbers
>between the parents left and right values and one level deeper.
Some discussion here, although without giving a proper name to the
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