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F+O 3.1 intended to delete the text specifying dayTimeDuration and yearMonthDuration and replace it with a reference to XSD 1.1, but this went wrong for some reason and the text still appears - including the Note that refers to XSD 1.1 as something that might happen in the future (section 8.1)
The WG agreed that this was editorial. Editor to fix.
Text now updated.