Chronological Thread 

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I have what I *think* is a bug in the CellML API, but I want to check to
make sure it's not a misunderstanding first.

I am reading the model
terkildsen_niederer_crampin_hunter_smith_2008/Pandit_Hinch_Niederer.cellml

which, in turn, imports Pandit_et_al_2001_endo.cellml

The first model imports a bunch of components from the second, and then
makes some connections between two components that it imported from that
second model:

<!-- These components are imported from the Pandit et al endocardial cell
model -->
<import xmlns:xlink="http://www.w3.org/1999/xlink";
xlink:href="Pandit_et_al_2001_endo.cellml">
<units name="mV" units_ref="millivolt"/>
<units name="uF" units_ref="microF"/>
<units name="mM" units_ref="millimolar"/>
<units name="mJ_per_mole_K"
units_ref="millijoule_per_mole_kelvin"/>
<units name="C_per_mole" units_ref="coulomb_per_mole"/>

<component component_ref="sodium_current"
name="pandit_sodium_current"/>
<component
component_ref="Ca_independent_transient_outward_K_current"
name="pandit_Ca_independent_transient_outward_K_current"/>
<component component_ref="steady_state_outward_K_current"
name="pandit_steady_state_outward_K_current"/>
<component component_ref="inward_rectifier"
name="pandit_inward_rectifier"/>
<component
component_ref="hyperpolarisation_activated_current"
name="pandit_hyperpolarisation_activated_current"/>
<component component_ref="background_currents"
name="pandit_background_currents"/>
<component component_ref="standard_ionic_concentrations"
name="pandit_standard_ionic_concentrations"/>
</import>

And, later:

<connection>
<map_components component_1="pandit_sodium_current"
component_2="pandit_background_currents"/>
<map_variables variable_1="E_Na" variable_2="E_Na"/>
</connection>


Now, you'll notice that the imported components have been given new
names--what used to be the component 'sodium_current' is now
'pandit_sodium_current'. So when I get to the connection in question, I
need to know which model it came from--if it came from the main model
(which it does), the components to connect will be 'pandit_sodium_current'
and 'pandit_background_currents', while if that connection was present in
the submodel, the component names will be 'sodium_current' and
'background_currents'. So, I ask the connection which model it came from:

rv = connection->GetModelElement(getter_AddRefs(topmodel));

...and this is where the API fails me, because 'topmodel' is
'pandit_et_al_2001_endo' instead of 'Pandit_Hinch_Niederer_Model'.

Presumably, it's lying to me because both of the variables it wants to
connect are in the first and not directly in the latter, but since the
names have changed, I can no longer find the varibles in question.

On the positive side, this is the first time the issue's come up when
going through all the models on cellml.org alphabetically, so making it to
the p's is pretty good!

-Lucian

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• [cellml-dev] The model of a connection, Lucian Smith, 03/30/2010

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