XML query engines: was RE: Is XML dead already or what?

[Glassbox]

>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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