Every document can have multiple versions, which is most useful during collaborative editing of manuscripts. The file format of each version of a document can be anything; users don’t edit things online (like Googles Apps) but rather use their favorite desktop tools — and then upload the results. Each contributed version is time-stamped upon upload so that the progression is quite clear. Each version can also be downloaded, but it is abundantly clear which version is the latest one — so people do not accidentally download and work with the wrong version.
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