Hi,
> If you don't want to update, but you do want to query for entire
> subtrees, do give nested sets more consideration.

But as Jay pointed out: Nested sets only work with one parent. Do they?
> 
> The best encoding for intervals I've yet seen is here:
> http://arxiv.org/pdf/0806.3115v1
> 
> Best wishes,
> Hamish
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