[UR-WG] Comment on duration format for WallDuration and CpuDuration

[Thomas Soddemann]

Donal K. Fellows wrote:
> Thomas Soddemann wrote:
>   
>> I guess the XSD Spec is a little vague here. They state that for the 
>> element "duration" ISO8601 is applied which also allows the kind of 
>> durations you refer to as time periods, but their examples are only in 
>> the [-]P... format.
>>     
>
> Both of these references:
>    http://www.w3schools.com/schema/schema_dtypes_date.asp
>    http://books.xmlschemata.org/relaxng/ch19-77073.html
> state that xsd:duration is to use the [-]P... format, as does the core
> spec at:
>    http://www.w3.org/TR/REC-xmlschema-2/#duration
> It's in the first paragraph of section 3.2.6.1.
>
> Donal.
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>   
Yep, that's what I meant. ISO 8601 defines durations plus the optional 
reference date. In the spec 
http://www.w3.org/TR/REC-xmlschema-2/#duration it is defined that the 
duration is in the format of ISO8601 which would allow to specify that 
optional date in front of the [-]P.
But a discussion on if the XSD spec is precise enough or not does not 
cover Bart's point.

Anyway, I agree with you, that the format [-]P... allows to express a 
duration in a very precise way, which should cover all or at least most 
of the requirements of implementors.

Thomas

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