[Odrl-version2] Dates and times in constraints

[Myles, Stuart]

Hi Francis,

 

I just read that page and I don't agree that they are in some way
pulling back from recommendations for working with ISO Dates and Times
laid out in

 

http://www.w3.org/TR/NOTE-datetime

 

Or maybe I just missed where they said it? Can you point to where the
above document is contradiction with
http://www.w3.org/International/wiki/WorkingWithTimeZones?

But, either way, I suggest that the issue we need to decide regarding
ODRL is whether specifying the timezone offset is important.

 

To take an example, let's say that someone specifies in ODRL that the
recipient is allowed to play a video on their website after
2011-11-05T13:15:30. Because there is no timezone offset applied, this
is what the W3C wiki refers to as a "floating time". In other words,
2011-11-05T13:15:30 occurs at different instants in different timezones.
Is there really a use case for that?

 

I think there *is* a use case for "floating times" when it comes to
dates. Specifying 2011-11-05 without specifying an exact timezone makes
sense to me, because if day is the granularity that is required, then
timezone is irrelevant (even though that "day" could be cover as much as
50 hours across the various timezones around the world). And if someone
does want to specify a particular instant, then they can do so by
supplying a time, as well as a date, with a timezone offset.

 

I am not opposed to having the ODRL core model allow for floating times,
if there's a use case. And, as we've already said, we can always rely on
profiles of ODRL to tighten the requirements for making timezone offsets
required, as needed.

 

Regards,

Stuart

 

 

 

From: odrl-version2-bounces at odrl.net
[mailto:odrl-version2-bounces at odrl.net] On Behalf Of Francis Cave
Sent: Wednesday, February 09, 2011 6:39 AM
To: 'ODRL-Version2'
Subject: Re: [Odrl-version2] Dates and times in constraints

 

It seems that W3C are pulling back from making time zone offsets
mandatory:

 

http://www.w3.org/International/wiki/WorkingWithTimeZones

 

This new draft of the W3C Note is currently out for comment.

 

Regards,

 

Francis

 

 

 

 

From: odrl-version2-bounces at odrl.net
[mailto:odrl-version2-bounces at odrl.net] On Behalf Of Francis Cave
Sent: 02 February 2011 12:54
To: 'ODRL-Version2'
Subject: Re: [Odrl-version2] Dates and times in constraints

 

That makes sense to me.

 

Regards,

 

Francis

 

 

 

From: odrl-version2-bounces at odrl.net
[mailto:odrl-version2-bounces at odrl.net] On Behalf Of ri at odrl.net
Sent: 02 February 2011 12:37
To: ODRL-Version2
Subject: Re: [Odrl-version2] Dates and times in constraints

 

 

On 2 Feb 2011, at 22:14, Francis Cave wrote:

 

XML Schema dateTime supports timezones, but doesn't mandate their use.
The W3C Note recommends that their use be mandatory.

 

Ok, I see know....

 

My view is the less we make mandatory in the Common Vocab, the more
flexible we are.

 

Mandatory options are best specified in Profiles, which have real-world
use cases.

 

 

Cheers

 

Renato Iannella

ODRL Initiative

http://odrl.net

 

 



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