On 12/09/11 20:30, Jonathan Cooper wrote:
Dear all,
I haven't gone through the detail of Andrew's draft, but a general point
occurred to me on reading the features list. Many tools would only
support a subset of these features (the most common being just ODEs with
no events). Does it make sense to require a secondary specification for
each combination of features, or should secondary specifications allow
for being combined to build up a desired feature set? In other words,
should the example instead be 3 specs (ODEs, DAEs, events) that can be
combined as a model author wishes?
Hi Jonathan,
I think the features potentially interact to some extent, so I don't
think they are entirely directly composable. However, it would certainly
be possible to build one secondary specification on top of one or more
other specifications with same manual work to sort out some semantics.
I think we certainly could produce an ODEs spec, and a DAEs spec (so
that software which suppports the DAEs spec would also support all
models coded to ODEs), and a DAEs + events spec that would support
models coded to the former two specs, as well as the infinitesimally
delayed / boolean variables features needed for events.
Best wishes,
Andrew
Also, I can't recall whether there will be any mechanism for a model
document to declare which secondary specification(s) it uses, if any?
Best wishes,
Jonathan
On 12/09/2011 03:27, Andrew Miller wrote:
Hi all,
The draft CellML 1.2 specification I sent out last week
(http://www.cellml.org/Members/miller/draft-normative-spec-andrews-preferred/toplevel.xhtml)
is very generic and delegates the responsibility for narrowing down the
scope of CellML to something that can be implemented to secondary
specifications.
To get an idea of what a secondary specification might look like, I've
created a draft for models with the following features:
* Differential algebraic equations (including ODEs) are supported.
* There can be multiple dependent variables, but only one independent
variable.
* Basic events can be handled using boolean variables and piecewise
based rules to make changes when events happen.
The draft is available at:
http://www.cellml.org/Members/miller/draft-secondary-spec-dae-events/toplevel.xhtml
It is also up on GitHub:
https://github.com/A1kmm/cellml-dae-events-secondary
Best wishes,
Andrew
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