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)
Cheers,
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)
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