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Re: [ontolog-forum] N3+, an N3-variant for units

To: "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Ed Barkmeyer <edbark@xxxxxxxx>
Date: Thu, 19 Mar 2009 18:22:56 -0400
Message-id: <49C2C5C0.5070902@xxxxxxxx>
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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