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Subject: Re: [xri] Datetime for ds:Signature

agreed, that makes a lot of sense.  Not sure where I got the "must not  
be used" language... I may have added that myself.


On Aug 11, 2009, at 12:21 AM, RL 'Bob' Morgan wrote:

> On Mon, 10 Aug 2009, John Bradley wrote:
>> XRD spec 2.2.2
>>    2.2.2. Element <Expires>
>> This xs:dateTime value indicates the time instant after which the  
>> document is no longer valid and must not be used.
> This may already have been discussed, but the "must not be used"  
> there makes me nervous, as there is a typical issue with this kind  
> of thing.
> It may be taken to mean:  after this time the party relying on this  
> document must assume the info in the document is no longer true and  
> must purge any record of this information from local storage.  That  
> is a tall order, and probably not what the signing party intends.   
> Usually such an element means:  the signer no longer guarantees the  
> information in the signed document is true after this time, so the  
> RP uses it at its own risk.
> To avoid getting into what "guarantees" means etc, it's pragmatic  
> for a spec, rather than saying "must not be used", to say something  
> like "the document does not validate after this time", as a  
> processing rule.  If that's what we want to say I suggest just  
> removing the "and must not be used" from this sentence.
> - RL "Bob"
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