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Stephen D. Williams <sdw@l...> wrote:
>One other subject that I haven't mentioned, but need for another
architecture that I designed
>a while ago is a mechanism for 'parallel inheritance' overlay tree
processing. Has anyone
>else worked on this? The idea is to have one or more base trees and work
with a delta tree
>which represents changes from the underlying trees. This last part is a
basic data structure
>for a rule engine and metadata application environment I designed last
year.
For general XML trees, I think you'll find that the only way to describe a
'delta' on a tree is using an XSL stylesheet, or something as complex, so
you might as well stick with XSL. We use "delta trees" very heavily, but in
a somewhat specialized form suitable for our application - the input trees
have to be in a very strict format and the set of operations is much
narrower then allowed in XSL.
Have fun,
Oren Ben-Kiki
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