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You may be right. I just found the groups proposal much simpler and
less daunting to implement than the multi one.

Chris

On Sep 9, 2009, at 6:34 PM, Blinov,Michael wrote:

> Adding a number to the group association will duplicate multistate
> multicomponent extension and still may require explanation. Totals
> of entities can be easily computed through functions over members of
> groups. If more information is required (like number of
> phosphogroups in home- and hetero-dimers), the only proper solution
> would be to use multi-state multi-component extension. I believe
> groups in the core are necessary as supplement to functions and
> rules. I hope that people requesting speciesTypes can be satisfied
> with groups. And, because groups are not used in simulations, extra
> burden on software tools will be minimal.
>
> Michael
> ______________________________________
> Michael Blinov
> Assistant Professor
> Center for Cell Analysis and Modeling
> University of Connecticut Health Center
> http://www.ccam.uchc.edu/mblinov/ <http://www.ccam.uchc.edu/mblinov/>
>
> ________________________________
>
> From: sbml-discuss-bounces@caltech.edu on behalf of Chris J. Myers
> Sent: Wed 9/9/2009 6:30 PM
> To: SBML Discussion List
> Cc: SBML Discussion List
> Subject: Re: [sbml-discuss] Proposed addition to L3 core
>
>
>
> This is why I suggest adding a number to the group association. So
> you could have a group CIt with species CI and CI2. CI would be
> associated with group CIt with value 1 and CI2 would be associated
> with group CIt with value 2.
>
> Chris
>
> Sent from my iPod
>
> On Sep 9, 2009, at 1:13 PM, "Michael Hucka" <mhucka@caltech.edu>
> wrote:
>
>> myers> I'm not sure though how strongly I would push to
>> myers> have such a concept in the core. I would not argue
>> myers> against it, since it is useful. If this idea is
>> myers> absorbed into the groups package, then I would like
>> myers> to see it modified to accept a number which can be
>> myers> interpreted as the number molecules in a complex as
>> myers> described above.
>>
>> Hi Chris,
>>
>> Although this is an attractive idea, there is a significant
>> problem in coming up with a universal way of counting the
>> entities (or summing the amounts of all the species). Your
>> example didn't involve a simple sum of X = A + B + C ...,
>> but multipliers (X = A + 2B ...), which means there must be
>> a scheme for people to express exactly how they want things
>> counted up. That in turn means arbitrary formulas. Where
>> would such formulas go, and how would it differ from using
>> parameters and assignment rules today? (I'm not being
>> dismissive here, just trying to think the ideas through.)
>>
>> MH
>>
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