Dear All,
I would much prefer semantically neutral keys to be assigned rather than using the text of the standard name in the URI. Standard Name texts have been revised in the past and there will probably be future changes, which destroys the permanence of the URI at a stroke.
I have arbitrarily assigned keys to the copy of the Standard Names served out by the NDG Vocabulary Server. These could be adopted or I could come into line with whatever CF decides upon. Anything in our vocab server may be referenced by the URL syntax:
http://vocab.ndg.nerc.ac.uk/term/list_id/version_number/key
At present this URL does nothing, but within a couple of months clients will be put in place to return and appropriate XML document with style sheet for browser rendering.
Cheers, Roy.
>>> Luis Bermudez <bermudez at mbari.org> 03/21/07 11:09 PM >>>
Mike..
Thanks for opening this discussion. To make this namespace official
it should be register in IANA:
http://www.iana.org/.
Also, it's OK to use ".". It will be a compliant URI.
Once we settle, I will make changes to the ontology that MMI is
making available via SEMOR (
http://marinemetadata.org:9600/semor/.)
However, there is a current discussion about using URLs vs. URNs. I
think at MMI we are moving towards using as much as possible URLs,
even if having service like the previous mentioned.
So maybe this is better:
http://www.cfconventions.org/standard_name#air_density
http://www.cfconventions.org/canonical_units#kg.m-3
And, it can resolve nicely in any web browser -:)
-Luis
___________________
Luis Bermudez Ph.D.
MMI Technical Lead -
http://marinemetadata.org
bermudez at mbari.org Tel: (831) 775-1929
MBARI 7700 Sandholdt Road, Moss Landing CA 95039-9644, USA
On Mar 21, 2007, at 3:07 PM, Godin, Michael wrote:
> Luis, Bryan, et al.,
>
> This discussion was tabled last year pending at arrival of a cf
> domain name. Now that the domain cfconventions.org exists, perhaps
> can we revisit defining namespaces for cf, such as:
>
> urn:org:cfconventions:standard_name:entry
> urn:org:cfconventions:standard_name:canonical_units
>
> and then for a particular entry we can uniquely identify it by saying:
>
> urn:org:cfconventions:standard_name:entry#air_density
> urn:org:cfconventions:standard_name:canonical_units#kg.m-3
>
> where the canonical units simply have "." substituted for " " (as
> implemented in the output of ucar.units.Unit.getDerivedUnit();
>
> What would it take to make such a set of namespaces official?
>
> Thanks, Mike
>
> _____________________________________________
> Michael A. Godin
> Software Engineer
> Monterey Bay Aquarium Research Institute
> http://www.mbari.org
>
> -----Original Message-----
> From: cf-metadata-bounces at cgd.ucar.edu [mailto:cf-metadata-
> bounces at cgd.ucar.edu] On Behalf Of Bryan Lawrence
> Sent: Monday, April 03, 2006 7:17 AM
> To: cf-metadata at cgd.ucar.edu
> Subject: Re: [CF-metadata] unique identifiers
>
>
> Hi Luis
>
> Funny you should suggest this .. .we're on the same path too.
>
> Suffice to say, if you can live with your temporary name space,
> we'll be able to propose something later this year ... (with a cf
> domain rather than ncar).
>
> Cheers
> Bryan
>
> On Thursday 30 March 2006 19:00, Luis Bermudez wrote:
>> Dear All,
>>
>> We need unique identifiers so we can better describe the information
>> we are sending in XML files. This is to support Feature catalogues,
>> ISO -19115, SensorML etc.
>>
>> Is there an official namespace for CF standard names ?
>>
>> If not then we could we create a namespace like the following:
>>
>> urn:edu:ucar:cf:standard_name:entry
>> urn:edu:ucar:cf:standard_name:canonical_units
>>
>> and then for a particular entry we can uniquely identify it by
>> saying:
>>
>> - urn:edu:ucar:cf:standard_name:entry#air_density
>> - urn:edu:ucar:cf:standard_name:entry#kg_m-3 (needs a little bit of
>> massage)
>>
>> At MMI we are using a temporal namespace (http://marinemetadata.org/
>> 2005/02/cf), but we are looking forward to have a synchronize
>> ontology
>> with your publish XML file, so we can have real time mappings with
>> other standard dictionaries.
>>
>>
>> Cheers,
>>
>> Luis
>>
>>
>> ---------------------------------------
>> Luis Bermudez Ph.D.
>> Software Engineer
>> MMI Liaison - http://marinemetadata.org bermudez at mbari.org
>> Tel: (831) 775-1929
>> Monterey Bay Aquarium Research Institute
>
> --
> Bryan Lawrence
> Director of Environmental Archival and Associated Research Head of
> the NCAS/British Atmospheric Data Centre CCLRC, Rutherford Appleton
> Laboratory Phone +44 1235 445012; Fax ... 5848; Web:
> home.badc.rl.ac.uk/lawrence
> _______________________________________________
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>
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Received on Thu Mar 22 2007 - 01:47:36 GMT
