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Delta compression

A topic of great interest to me which is related to the Xanadu project
is "delta compression, the algorithmic task of finding common strings
between versions of data and using the commonality between versions to
compactly encode one version by describing it as a set of changes from
its companion."

Read more about it on the web site of my former employer, IBM Almaden
Resarch Center Computer Science Dept:

     - Rich