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I'm interested in this too. Would it be easier to simply make a "snapshot" of the original, change it, and store it? I don't know how memory intensive this would be for large chucks of text but if it's not much then it sounds like the easiest way to do it. You can even compare the changes from the most current version with the previous versions with a simple character-by-character comparison I would believe.

 

Or maybe for each revision, the original document is only changed with dated tags around the original part. Subsequent changes to that part would result in more tags like so...

 

Original

[010120071201]1st revision to [/010120071201]original (Jan. 1, 2007 12:01am)

[010120071201][010220071201:2]1[/010220071201]nd revision to [/010120071201]original (Jan. 2, 2007 12:01am with change from 1 to 2)

 

Output:

Original

1st revision to original

2nd revision to original

 

and so forth. Then we can parse the timestamped tags and show the most recent changes (if the user requests that) or an earlier version. Well... scratch that... this looks too complicated ;D I'm sure there's an easier way.

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