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This mail is in response to the WG's decision on R-173. John Mercado asked what the canonical lexical representation of duration is; the WG decided that there is no need to specify it, since there is only one lexical representation per value. This reply seems to contradict the recommendation: If the number of years, months, days, hours, minutes, or seconds in any expression equals zero, the number and its corresponding designator may be omitted. [section 3.2.6.1] Thus, for example, "P1Y" and "P1Y0M" are alternative lexical representations for the same value. Furthermore, according to erratum E2-23, leading zeroes are permitted in each field, making "P01Y" a third alternative. Mercado's question is pertinent. See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002OctDec/0131.html
Discussed and classified at the 2003-11-21 telecon. Ashok to prepare text. Resolution: Proposed text: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2003Nov/0053.html DaveP's comments: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2003Dec/0011.html