https://bugzilla.wikimedia.org/show_bug.cgi?id=21860

John Erling Blad <[email protected]> changed:

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--- Comment #14 from John Erling Blad <[email protected]> 2010-07-12 20:13:52 UTC 
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An additional field for one or more digests would be very useful for analysis
purposes. Examples are WikiDasboard-like gadgets that shows who wrote the bulk
of the content [1] (screendump from Norwegian (bokmål) Wikipedia [2]), history
trees showing revert activity [3], identification of type of action, etc. This
will have uses at least on the history page, the user contributions page and
the recent changes page.

For some types of analysis the size of the content is sufficient, and if better
identification is necessary the content for the revisions that seems similar
because of the size can be downloaded, yet it would be better to have a digest
instead. By using digests it won't be necessary to branch out to some special
code to download additional information, the information would be readily
available.

Calculating the value in the server each time they are used does not seems to
be viable, yet it could be calculated if it is missing and then stored in the
database. Different use may need different digests, but a MD5-like digest of
the complete article and a Nilsimsa-like digest should be sufficient for most
purposes. Not sure how Nilsimsa would turn out for large articles... 

[1] http://blog.wikimedia.org/2010/wikidashboard-revisited/
[2] http://no.wikipedia.org/wiki/Fil:Skjermdump-history-graphic.png 
[3] http://www.grouplens.org/node/427

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