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[ontology-summit] Progressing a Units Ontology - Now

To: ontology-summit@xxxxxxxxxxxxxxxx
From: David Price <david.price@xxxxxxxxxxxx>
Date: Thu, 7 May 2009 12:09:48 +0100
Message-id: <200905071209.49340.david.price@xxxxxxxxxxxx>
All,    (01)

As part of the ballot comment resolution on OASIS PLCS Public Review Draft 1 
[1] we have a requiremend to publish support for SI units in an OWL DL 
ontology for use as "reference data" in the next couple of months. I've taken 
the action in that project to follow up on the idea of a Units ontology that 
was discussed during the summit. The "reference data" use case does not 
depend on interesting inferences to be made using the ontology, source system 
statements encoded in an exchange file that are then decoded by a target 
system are all that we require today.    (02)

While searching the Web I found email threads on this topic from 2006 and 
2007, some of which included me, and there's no visible progress on units 2-3 
years later. The PLCS team recognises that a full solution isn't feasible in 
a couple of months, but do need to push something through as a starting point 
that people can use in their implementations. We do recognize that things may 
change over the next few years, but simply cannot wait any longer.     (03)

We also plan to use the resulting units ontology with the ISO AP233 Systems 
Engineering [3] standard for the same "reference data" purposes, so the 
ontology will also be visible in the OMG as well where it will be referenced 
in the SysML/AP233 mapping specification [4].    (04)

We've been reviewing the NASA Sweet Units Ontology V1.1  [2] and would like 
comments on that as a potential starting point - at least we know it's been 
used on real engineering projects and have AP233 team members from NASA. 
Clearly the NIST UnitsML [5] work is related, but is not an ontology. I've 
seen emails threads about ontology work based on UnitsML but nothing 
published.    (05)

So, my questions are:    (06)

Anyone with recommendations other than Sweet as a starting point ontology 
(e.g. is there a UnitsML ontology somewhere) ?    (07)

Anyone interested in, or know of anyone else interested in, working to an 
interim conlcusion on this topic over the next couple of months?    (08)

I'm quite happy to set up telecons, Web meetings, etc. in support of 
progressing this topic. Of course, we're also happy if Ontolog, W3C or anyone 
else wants to support this initiative as well.    (09)

David    (010)

[1] http://docs.oasis-open.org/plcs/dexlib/oasis_cover.htm
[2] http://sweet.jpl.nasa.gov/ontology/
[3] http://www.ap233.org/
[4] http://www.omgwiki.org/OMGSysML/doku.php
[5] http://unitsml.nist.gov/    (011)

Mobile +44 7788 561308 UK +44 2087473900 Skype +1 336 283 0606    (012)

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