Joel Bender wrote: (01)
> the "I call this property/you call this an attribute" discussions, there
> is a common understand of "measure", and yet I have not found a
> consistent and strong way of representing it. (02)
We have made some effort at ontologies in this area, based in part on
the International Vocabulary for Measurement, a publication of the
Bureau Internationale des Poids et Mesures (BIPM):
http://www.bipm.org/en/publications/guides/vim.html (03)
It is, as you say, a difficult problem. (04)
> For the purpose of this discussion I going to define a variant of N3 off
> the top of my head, I'll call it N3+ (if there is already an N3+
> language out there, I apologize). N3+ is just like N3 except that the
> data type can be a unit of measure.
>
> :joel ex:height "2.0"^^si:meter . (05)
> So just like "2.0"^^xsd:float maps the character string "2.0" into the
> number 2.0, "si:meter" not only maps it to same numeric space as
> xsd:float but also to si:length as the UnitsML quantity "length" (which
> doesn't have a URI that I've been able to find). (06)
We had this same problem with SI quantity(type) "time". Technically,
these terms should have URIs beginning with urn:iso:std:... that are
identifiers for terms defined in ISO 31 and ISO 1000. But between the
W3C insistence on using http: to begin URIs and the ITU-T insistence on
using urn:oid:<magic numbers>, I don't know what became of the iso
prefix (I never saw the registration of the ISO URN on the IANA or IETF
site). (07)
> So my mission is to describe si:meter, using rdf/rdfs/owl serialization,
> that captures those concepts. (08)
I applaud your effort. Let us know when you have success. (09)
-Ed (010)
--
Edward J. Barkmeyer Email: edbark@xxxxxxxx
National Institute of Standards & Technology
Manufacturing Systems Integration Division
100 Bureau Drive, Stop 8263 Tel: +1 301-975-3528
Gaithersburg, MD 20899-8263 FAX: +1 301-975-4694 (011)
"The opinions expressed above do not reflect consensus of NIST,
and have not been reviewed by any Government authority." (012)
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