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Cloned from launchpad blueprint https://blueprints.launchpad.net/swift/+spec/object-variation. Description: Allow an object to have variant versions which are derived from the original master object. The access of object can be smartly adapted for different clients (web browser, mobile app, video player) Use case: 1. A video object can have different encodings (MPEG, AVS, H.264 etc. ) and formats(mov, avi, wmv, 3gp, flv etc.) 2. An image object can have different size of images which are generated from the original master image. Specification URL (additional information): None