I think that they are not suitable each other, due the lack of rewind of datastore cursors, i.e you can seek to the next offset but you are not allowed to move back. To do that you have to make some kind of hack that keeps all previous cursor positions. For more information about paging you can take a look at http://sites.google.com/site/io/building-scalable-web-applications-with-google-app-engine (Slide 33-34).
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