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- From: "Glassbox" <glassbox@wanadoo.fr>
- To: <xml-dev@ic.ac.uk>
- Date: Sun, 31 Jan 1999 22:46:33 +0100
>There exists a neat trick which enables simple SQL-Select queries answering
>for two given nodes, whether one is a subnode of the other, and also how
>many levels deep, in constant time, assuming you do some simple
>preprocessing on the structure. (Assigning two integers to each node in the
>tree).
Can you please explain it precisely ?
Thanks,
Guillaume
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