Dimensionality is a very tough one though, unless you agree to limit yourself
to discrete value sets.
On the original question of having URIs for certain SI unit types, there are a
number of other questions not touched upon here, concerned with governance:
unless someone is prepared to stick a stake in the ground and assume
responsibility (e.g. the maintenance authorities for the respective ISO
standards), it is difficult to say what the value of any URI set would be.
After all, anybody can (and probably will or already has) create such a list if
it serves a purpose: theirs. The objective here is surely to make such URIs
functionally useful to anyone, hence the issue of governance and visibility.
Some standards organisations make a public commitment not only to sustain their
standards online with permanent URIs (OASIS, W3C, etc) but we need a way of
getting them to recognise the related problem of the value sets used and have
permanent identifiers for them too: we did this in OASIS a few years back for
the ISO standards for languages and countries but I don't think anyone did this
for any other sets.
For our own work, we are using the ISO 13250 Topic Map standard's "Published
Subject Identifier", designed for exactly this, and using URIs as the
identifier string. Our partner company will shortly be launching a service that
will load, manage and provide URIs for use in Topic Maps, RDF and OWL, but I
don't have the details yet... (01)
Regards,
Peter (02)
Peter F Brown
Managing Director
Pensive S.A. (03)
Pensive S.A. is registered in Belgium, N° 895.677.610 (RPM Brussels)
Registered Office: Avenue de Mercure 13/13, B-1180 Brussels
Correspondence/Visits: Avenue Brugmann, 382, B-1180 Brussels (04)
-----Original Message-----
From: ontology-summit-bounces@xxxxxxxxxxxxxxxx
[mailto:ontology-summit-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Olken, Frank
Sent: 20 March 2009 17:28
To: steve@xxxxxxxxxxx; ontology-summit@xxxxxxxxxxxxxxxx; David Leal
Cc: Howard.Mason@xxxxxxxxxxxxxx; jjb5@xxxxxxxxxxx
Subject: Re: [ontology-summit] URIs for quantities, units and scales (05)
David, Steve, (06)
I am VERY INTERESTED in measurement units and dimensionality ontologies
and have been for some time. Dimensionalities form a very interesting
type system with an algebra (multiply/divide quantities and you can
infer
the dimensionality / units of the result). (07)
Frank Olken (08)
National Science Foundation
Computer and Information Science and Engineering Directorate
Intelligent Information Systems Division
Information Integration and Informatics Program
Suite 1125
4201 Wilson Blvd.
Arlington, VA 22230 (09)
Tel: 703-292-8930 (main)
Tel: 703-292-7350 (direct)
Email: folken@xxxxxxx
Twitter: http://twitter.com/frankolken (010)
-----Original Message-----
From: ontology-summit-bounces@xxxxxxxxxxxxxxxx
[mailto:ontology-summit-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Steve Ray
Sent: Friday, March 20, 2009 10:28 AM
To: 'David Leal'
Cc: Howard.Mason@xxxxxxxxxxxxxx; ontology-summit@xxxxxxxxxxxxxxxx;
jjb5@xxxxxxxxxxx
Subject: Re: [ontology-summit] URIs for quantities, units and scales (011)
David,
Very interesting document. I have a question. Shouldn't a
self-consistent
ontology be created for units and quantities before the URIs are
created?
And would the creation of such an ontology be a good target for this
community (arm in arm with TC12 and others)? (012)
- Steve (013)
-----Original Message-----
From: David Leal [mailto:david.leal@xxxxxxxxxxxxxxxxxxx]
Sent: Friday, March 20, 2009 2:33 AM
To: steve@xxxxxxxxxxx
Cc: jjb5@xxxxxxxxxxx; Howard.Mason@xxxxxxxxxxxxxx; Radack@xxxxxxx;
dr.matthew.west@xxxxxxxxx; nicolas.figay@xxxxxxxx;
david.price@xxxxxxxxxxxx;
michel.bohms@xxxxxx
Subject: URIs for quantities, units and scales (014)
Dear Steve, (015)
The attached document attempts to explain the need for URIs for
quantities
units and scales to the standardisation community. The document results
from
work within ISO TC184/SC4 and within the W3C Product Modelling XG, which
identified the handling of units of measure on the Web as a key
priority. (016)
There has been initial contact with Anders Thor the chair of ISO TC12,
and
with ISO CS, but it is difficult to make further progress because it
impinges upon so many aspects of standardisation. (017)
The document has consensus as a summary, but David Price points out that
dereferencing URIs for quantities, units and scales is a secondary
issue,
and that mentioning it may "frighten the horses". (018)
Best regards,
David (019)
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