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Section D.1 says "A value of 60 or more is allowed only in the case of leap seconds". Is the "or more" just intended to cover a fractional second or is it intended to allow values >= 61? The specs for Java and ISO C allow a value of 61, but as far as I can see the official spec for UTC only allows a single leap second. See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002AprJun/0048.html
Clarification without erratum: http://www.w3.org/XML/Group/2003/07/xml-schema-ftf-minutes.html#d0e488 See the reply: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002AprJun/0066.html