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When is T designator required with duration?

From: James Clark <jjc@jclark.com>
Date: Sun, 28 Apr 2002 19:11:02 +0700
To: www-xml-schema-comments@w3.org
Message-ID: <1160995192.1020021062@[]> 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".)

Received on Sunday, 28 April 2002 08:08:46 UTC

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