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It would be great if the reader would let the user select which version to show, but note that the spec does not provide any way to identify the different versions, other than by media-type. If you wanted, for instance to provide two alternative PDF versions, one with large font, one with smaller font, there is no way the user can know in advance which is which, even if the reader lets him/her choose between PDF 1 and PDF 2.
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