[Nml-wg] NML base in the rnc schema

[Aaron Brown]

On Apr 27, 2011, at 4:09 AM, Jeroen van der Ham wrote:

> On 26/04/2011 16:11, Roman Łapacz wrote:
>> W dniu 2011-04-22 23:40, Aaron Brown pisze:
>>> Hey Roman,
>> 
>> Hi Aaron,
>> 
>>> 
>>> Overall, it looks good. A few questions on the schema.
>>> 
>>> 1. It'd be good if StartTime/EndTime/Duration were specified
>>> explicitly instead of being anyElement* (e.g. an xsd:string that
>>> contains a unix timestamp)
>> 
>> I did this way to have it very generic. The UML diagram from
>> nml-base.pdf does not define too much details. For Lifetime it has only
>> "sequence of (start,end)".
> 
> I agree that we could do with a better specification of those dates and
> the duration. Iirc there are some standard types in XML that can handle
> that.

Looks like there are some defined in http://www.w3schools.com/Schema/schema_dtypes_date.asp . They're kinda verbose, and don't seem to offer sub-second granularity, but I'm not sure either is all that important.

>>>    - Relatedly, is there any reason to have both Duration and EndTime
>>> instead of just one or the other?
> 
> I think there are some scenarios where you'd use one or the other, or
> perhaps even both where you ask for a link that you will use for some
> duration, but it has to be before endTime.

I'm not sure the semantics all that intuitive. e.g.

<lifetime>
    <duration>3600</duration>
    <endTime>1304510973</endTime>
</lifetime>

Does the above mean "the circuit finishes at time 1304510973 and was active for 3600 seconds", or "the circuit is valid no later than time 1304510973, but was active for 3600 seconds sometime before then". Does this change if startTIme is specified as well?

> 
>>> 2. Apparently, in the US, zip codes can have a different form than
>>> just an integer. 5 digits, a hyphen and 4 digits (e.g. 20037-8001):
>>> http://en.wikipedia.org/wiki/ZIP_code#ZIP.2B4
>> 
>> I took it from
>> https://svn.internet2.edu/svn/nmwg/trunk/nmwg/schema/rnc/topo/nmtopo_base.rnc.
>> This can be updated.
> 
> Zipcode would be a good place to have just an xsd:string. Who knows what
> crazy scheme some countries come up with :)

I'm sure the US can come up with a crazier scheme. I'll write my congress critters :)

Cheers,
Aaron

Summer 2011 ESCC/Internet2 Joint Techs
Hosted by the University of Alaska-Fairbanks
http://events.internet2.edu/2011/jt-uaf

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