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Semantically I think this is fine and theoretically does not change
the meaning of connections.

It's important to highlight that software developers will need to:

1) relax the validation constraint for the existing rule (i.e. only
one connection between any two components)
2) understand that component_1 and component_2 of map_components can
change order over connection elements between the same components
(some software may have used the current notion of there being only
one connection and one order to component_1 and component_2 to
optimise in memory object references)

I think this could have some pronounced effects on some software.

I wouldn't mind reworking the connection syntax altogether ... but
that's another proposal.




On 8/29/07, Andrew Miller <ak.miller at auckland.ac.nz> wrote:
> Hi all,
>
> Are there any objections to marking this as something we should include
> in CellML 1.2?
>
> Best regards,
> Andrew
>
> cellml-tracker at cellml.org wrote:
> > Andrew Miller <ak.miller at auckland.ac.nz> has asked for
> > Include_in_CellML_1.2:
> > Tracker Item 153: Allow multiple connections between the same pair of
> > components
> > http://bowmore.elyt.com/bugzilla/show_bug.cgi?id=153
> >
> > ------- Additional Comments from Andrew Miller <ak.miller at
> > auckland.ac.nz>
> > Section 3.2.4 of CellML 1.1 states, in the second sentence of the second
> > paragraph: "Only one connection may be created between any given pair of
> > components in a model".
> >
> > This is a fairly pointless restriction from all fronts:
> > * From a model authors perspective, it creates a burden on the author to
> > consolidate all their connections which may have been created for
> > different
> > purposes, and current model authors claim that such consolidation is time
> > consuming and error prone.
> > * From a model readability perspective, it is also burdensome because
> > connections between variables may not be in a logical order (this is less
> > of an
> > issue if tools are used, but the point still holds).
> > * Implementation experience suggests that it is no harder to allow
> > multiple
> > connections between the same pair of components when writing simulation
> > software, but the extra constraint imposes more work on developers when
> > writing
> > tools which try to validate the model.
> >
> > To fix this, we could simply drop the first two sentences of the second
> > paragraph of Section 3.2.4, and perhaps replace them with a short
> > explanation.
> > _______________________________________________
> > cellml-discussion mailing list
> > cellml-discussion at cellml.org
> > http://www.cellml.org/mailman/listinfo/cellml-discussion
> >
>
> _______________________________________________
> cellml-discussion mailing list
> cellml-discussion at cellml.org
> http://www.cellml.org/mailman/listinfo/cellml-discussion
>

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• [cellml-discussion] Include_in_CellML_1.2 requested: [Tracker Item 153] Allow multiple connections between the same pair of components, cellml-tracker at cellml.org, 08/29/2007
  • [cellml-discussion] Include_in_CellML_1.2 requested: [Tracker Item 153] Allow multiple connections between the same pair of components, Andrew Miller, 08/29/2007
    • [cellml-discussion] Include_in_CellML_1.2 requested: [Tracker Item 153] Allow multiple connections between the same pair of components, Alan Garny, 08/29/2007
    • [cellml-discussion] Include_in_CellML_1.2 requested: [Tracker Item 153] Allow multiple connections between the same pair of components, Matt, 08/31/2007
  • [cellml-discussion] Include_in_CellML_1.2 requested: [Tracker Item153] Allow multiple connections between the same pair of components, David Nickerson, 08/29/2007
    • [cellml-discussion] Include_in_CellML_1.2 requested: [Tracker Item153] Allow multiple connections between the same pair of components, Andrew Miller, 08/29/2007
      • [cellml-discussion] Include_in_CellML_1.2 requested: [TrackerItem153] Allow multiple connections between the same pair of components, David Nickerson, 08/29/2007
        • [cellml-discussion] Include_in_CellML_1.2 requested: [TrackerItem153] Allow multiple connections between the same pair of components, Jonathan Cooper, 08/31/2007
    • [cellml-discussion] Include_in_CellML_1.2 requested: [Tracker Item153] Allow multiple connections between the same pair of components, Jonna Terkildsen, 08/29/2007
      • [cellml-discussion] Include_in_CellML_1.2 requested: [TrackerItem153] Allow multiple connections between the same pair of components, David Nickerson, 08/29/2007

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