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3.2.6.1 says: "The designator 'T' shall be absent if all of the time items are absent" Shouldn't this be "if and only if" rather than "if"? I don't think something like P24H can be allowed since there would be an ambiguity whether M meant months or minutes. (The use of "shall" here feels rather ISO-ish; tt would be more stylistically consistent to use "must".) See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002AprJun/0082.html
http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002AprJun/0086.html Resolution: Discussed at the May 31 telecon. Errata text proposed at: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002May/0151.html was approved. Erratum E2-24 was added.