>
> A(1,14)
> |
> ------------------
> | |
> B(2,7) C(8,13)
> | |
> ---------- ----------
> | | | |
> D(3,4) E (5,6) F(9,10) G(11,12)
>
>
>where the first number in parenthesis represents left child and the second one the right child. You can extract each subtree easy by doing a query to get only nodes that are in between the left and the right numbers of a node.
>There's some manipulations to do when comes the time to insert a node but it's not so complicated.
>
François,

This makes me think to genealogy where there is a comparable system called "Soza" numbers. By giving your ancestors a Soza name you know where they are in the tree. Well, that was by the time researchers were doing their things by hand...

José