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QT approved comment In 3.3.13, to be pedantic, the definition "gMonthDay represents whole calendar days that recur at the same point in each calendar year" doesn't cover the case of --02-29. The same applies to the definition of gDay, though in that case the spec mentions the fact.
"(Obviously, days beyond 28 cannot occur in all Februaries; 29 is nonetheless permitted.)" is added at the end of the first paragraph of 3.3.13.
The change proposed above was approved by the WG in its call of 1 December 2006. It is now reflected in the status quo version of the Datatypes spec. Accordingly, I am setting the disposition of this issue to RESOLVED / FIXED. If the originator of the issue would examine the change and let us know whether it satisfactorily resolves the problem or not, we'd be grateful. To signal that the resolution is acceptable, change the status of the issue to CLOSED. Otherwise, to signal that it's NOT acceptable, change the status to REOPENED (and tell us what's wrong). If we don't hear from you in the next three weeks, we'll assume that silence betokens consent, and close the issue ourselves.