P.S. You seems to be obsessed with an optimization of ancestor walks.
Are you sure you have a problem in the first place?
Obsessed is the wrong word - perhaps "mildly interested" is more
accurate - but yes I would say it's a problem to have to walk the
ancestor axis for every node. Why? It can be expensive depending on
the tree model and it prevents potential streaming optimisations.
And of course, when the application is large enough and used by enough
people, a slight performance tweak can save a lot of money.
If ancestor walks are what the profiling shows as a bottleneck then it's
definitely worth for an attention. I wouldn't trusted to a feeling. Besides, I
think explicit optimization can harm to an optimization that engine may perform
on itself.
--
Vladimir Nesterovsky
http://www.nesterovsky-bros.com/
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