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Subject: RE: [plcs] Classification of SI Units


Title: RE: [plcs] Classification of SI Units

I think the problem has another related aspect.  Use of classification can also cover another key feature within the modules for units, namely derived units.  If one has the unit "m/s^2" does one classify as is or does one use the drived unit feature to build the unit from the constituent units?  My preference would be to build the derived unit because this supports full dimensional analysis for validation of calculations.  However, for those who do not see the benefit of this capability, quite clearly classification offers an attractive "short cut" that circumvents the complexity that is necessary to represent the full derivation.  If we end up with a "mixed economy" then we will not be able fully to harmonise and compare data sets.

Cheers,
Tim.


-----Original Message-----
From: Ian Bailey [mailto:ian.bailey@eurostep.com]
Sent: 28 July 2004 21:55
To: plcs@lists.oasis-open.org; plcs-dex@lists.oasis-open.org
Subject: [plcs] Classification of SI Units


Hi Folks,

I've been working on  the "representing_properties_numerically" capability,  where an issue has been raised by Tom Hendrix. We have been classifying (i.e reference data) the units which are used with properties. Tom has pointed out that the STEP models have a full breakdown of SI units already and there could be a conflict between the value set there and what is classified. Has anyone looked into this issue ?

Regards
--
Ian Bailey
Eurostep Limited - www.eurostep.com
t&f: +44 (0) 20 7378 1894
  m: +44 (0) 7768 892362 


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