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Dear Matt,

Just a quick thought on your suggestion...

I have yet to go through the CellML 1.1 specification. As far as I can
remember from CellML 1.0, each variable must have a unit associated to it
and, in our software, we re-inforce that rule by having all the standard
units "hard coded". In other words, the user can use them straight away and
there is no need to declare them in the first place or, for instance, to
import them (using CellML 1.1).

Now, from your second example, I can see a reason why one would do as you
suggest. This said, any software that currently implements the standard
units the way we do it will have to be amended, so that the standard units
don't appear as being re-declared. Another concern is that someone may not
have your latest version of the standard units. How do you deal with that?

In conclusion, though I appreciate your original concern, I would personally
stick to the way we have done it so far. Our software being CellML 1.0
conformant, the user knows that s/he has access to these standard units, no
matter what, and doesn't need to think about importing them, or make sure
that s/he has the latest standard units file. Should that list of standard
units get new additions, I would expect that to be done through the release
of a new version of the CellML specification.

Cheers, Alan.

> -----Original Message-----
> From:
> cellml-discussion-bounces AT cellml.org
>
> [mailto:cellml-discussion-bounces AT cellml.org]
> On Behalf Of
> Matt Halstead
> Sent: 06 August 2004 00:50
> To: For those interested in contributing to the development of CellML.
> Subject: [cellml-discussion] cellml units
>
> Section 5.2.1 of the cellml 1.1 specification
> (http://www.cellml.org/public/specification/20030930/
> cellml_specification.html#tab_units_cellml_units_dictionary)
> describes the dictionary of standard units. Since we now
> have imports, is there any reason not to create a SI base
> unit library that declares each of these units in this table
> as a base_unit, and which modellers should probably import by default?
>
> A case example where this is useful in application
> development is an editor application that forces a user to
> select a units for each
> variable. If these units in table 2 were represented as a
> library and
> imported, then we can simplify the method for building units
> available for a variable.
>
> Another use-case is providing a mechanism to curate this
> table of units, we would be free to add new definitions,
> annotate them with RDF, and then argue about them.
>
> just a thought.
>
> cheers
> Matt
>
> _______________________________________________
> cellml-discussion mailing list
> cellml-discussion AT cellml.org
> http://www.cellml.org/mailman/listinfo/cellml-discussion

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• [cellml-discussion] cellml units, Alan Garny, 08/06/2004
  • [cellml-discussion] cellml units, Matt Halstead, 08/06/2004
    • [cellml-discussion] cellml units, Alan Garny, 08/06/2004
      • [cellml-discussion] cellml units, Matt Halstead, 08/07/2004
        • [cellml-discussion] cellml units, Alan Garny, 08/07/2004
  • <Possible follow-up(s)>
  • [cellml-discussion] cellml units, Warren Hedley, 08/07/2004

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