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- ManPage. The [http://en.wikipedia.org/wiki/Diff Wikipedia entry] is instructive.
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- At the moment, WalaCode stores diffs for every change to a page, although only the most recent one is exposed to the user in any way. In theory you could apply these in reverse to get to any point in a page's history. In practice, that probably means "if your archive of pages & diffs is pristine rather than the end result of many changes & file operations not filtered through WalaCode".
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- The more I think about this, there ought to be real heavy-duty revision control behind any serious collection of documents.
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