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Hi Bernard,

I have thought about this a little. The biggest problem with using an
ontology is that there doesn't seem to be any possibility of a mechanism for
allowing user-defined units. The units ontology at present also doesn't
appear to contain enough information to perform units conversions.

It would certainly be beneficial to have a single units language across all
COMBINE standards. Given that the SBML world has considered CellML's units to
be too complicated, I'm not sure what they'd think of UnitsML! But producing
our own version of such a standard does seem rather foolish. I wonder if
there's scope for a 'lite' version of UnitsML that could be incorporated?

From the very brief look I had, UnitsML does seem pretty comprehensive. I
wasn't too enamoured of their approach to defining conversions though - you
ought in most cases to be able to deduce appropriate conversions from the
units definition, so it may be that they're lacking detail there.

Best wishes,
Jonathan

On 28/09/11 10:34, Bernard de Bono wrote:
> Hi,
>
> Is, alternatively, the use of an ontology for units also a consideration?
> Terms from such an ontology could be applied to the annotation of semantic
> metadata associated both with (i) model variables, as well as (ii) related
> datasets.
>
> Thoughts most welcome.
>
> All the best,
>
> Bernard
>
>
> On 28 September 2011 09:49, Steve McKeever <Steve.McKeever at cs.ox.ac.uk
> <mailto:Steve.McKeever at cs.ox.ac.uk>> wrote:
>
> Hi,
> Only had a quick read through but it looks good, perhaps a bit too
> comprehensive for CellML and FieldML. Hard to tell if it will become
> *the* standard for units though.
> Steve
>
> On 27 Sep 2011, at 01:04, David Brooks wrote:
>
>> Hi,
>>
>> I've come across the Units Markup Language (UnitsML,
>> http://unitsml.nist.gov/), which is a project of the National
>> Institute of Standards and Technology for encoding scientific units of
>> measure in XML. It is currently being standardised by OASIS (the
>> Working Draft is at
>>
>> http://www.oasis-open.org/committees/download.php/42538/UnitsML-Guide-v1.0-wd01.pdf).
>>
>> Should UnitsML be embedded in a future version of CellML? In FieldML?
>> To become the preferred way to specify units in the various MLs??
>>
>>
>> Regards,
>> Dave
>> _______________________________________________
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>> cellml-discussion at cellml.org <mailto:cellml-discussion at
>> cellml.org>
>> http://lists.cellml.org/mailman/listinfo/cellml-discussion
>
>
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• [cellml-discussion] UnitsML, David Brooks, 09/27/2011
  • [cellml-discussion] UnitsML, Steve McKeever, 09/28/2011
    • [cellml-discussion] UnitsML, Bernard de Bono, 09/28/2011
      • [cellml-discussion] UnitsML, Jonathan Cooper, 09/28/2011
        • [cellml-discussion] UnitsML, David Brooks, 09/29/2011

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