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IMS has been working for many years on a version 2 of IMS QTI, and version 2.0 was introduced and finalized, and then a draft version 2.1. You may have seen some controversy recently as the IMS has withdrawn the draft version 2.1 of QTI, removing it from their website saying that they want to review it and change it.
Version 2.1 of QTI XML has been in draft form for a couple of years, and although Questionmark hasn’t yet supported it, very many projects have done so, and there is concern from those who have implemented it that their work might not be valid when 2.1 or 2.2 is finalized. See Rowin Young of CETIS’s blog for one perspective on this.