xml diff?

[Pavel Velikhov]

Mark D. Anderson wrote:
> 
> Suppose I want the "diff" between two xml files.
> 
> I can imagine a few approaches:

> - graph-theoretic:
> surely there must be some CS work on algorithms for finding
> the least cost path between two trees, expressed as a sequence
> of operations? the simplest is with just the operations of
> add/delete of subtrees, but move and copy are interesting too.
> 
> -mda

Here is a great paper on edit distance between trees (includes rather fancy edit commands, the result in an NP-complete problem however. But
you can choose any subset that seems useful and efficient):

S. Chawathe, H. Garcia-Molina "Meaningful Change Detection in Structured Data", SIGMOD 1997, http://www-db.stanford.edu/pub/papers/bbdiff.ps 

Pavel

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