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In 10.4: >This proposal uses the reference xs:dateTime >1972-12-31T00:00:00 in the description of the >comparison operators. >The reference xs:dateTime used must meet the >following constraints: when used to supply >missing components into xs:time values the date >must allow for leap seconds; Schema is removing any consideration of leap-seconds. Dave Peterson for the XML Schema WG
The WGs agreed to remove support for and mention of leap seconds in the F&O document during the meeting in Redmond WA on July 19, 2006. Michael Sperberg-McQueen and Ashok Malhotra were charged with crafting appropriate wording.