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Re: data expression of date information

From: Al Gilman <asgilman@iamdigex.net>
Date: Thu, 19 Dec 2002 10:09:58 -0500
Message-Id: <5.1.0.14.2.20021219090550.02325e60@pop.iamdigex.net>
To: Wendy A Chisholm <wendy@w3.org>, w3c-wai-er-ig@w3.org
Cc: John Cowan <jcowan@reutershealth.com>

At 09:16 PM 2002-12-18, Wendy A Chisholm wrote:

>8. date.  TO DO.
>I have an action item from last week to do some research.

As it happens, John Cowan and I were reminiscing about this as our cocktail
party conversation at XML2002.

1. Standard practice that EARL should adhere to:

- Base semantics on the ISO standard.

- Define 'date' as a subset of dateTime, which you define first.

2. Precedents you should check before deciding on subsets and encoding:

XML Schema (types)

IETF Calendaring and Scheduling - RFC3339

3. Personal recommendation:  In your 'date' subset do not allow, or at least
discourage, the omission of a localOffset indication.  Actually, for 
logging purposes of observations related to the Internet, a full dateTime 
should be preferred anyway.

4. Warning: omitting localOffset is legitimate in planDateTime if a location
is given in geographic terms.  This is the "when it's noon in Boston" usage
as opposed to "17:00 UTC" or "12:00 -05" usage.  But I don't think that this
needs to be anything more than a remark in defining how to express past events
in EARL.

Al



>Best,
>--wendy
>
>[1] http://lists.w3.org/Archives/Public/w3c-wai-er-ig/2002Dec/0015.html
>
>
>--
>wendy a chisholm
>world wide web consortium
>web accessibility initiative
>http://www.w3.org/WAI/
>/--
Received on Thursday, 19 December 2002 10:03:16 GMT

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