Parametric stoichiometry coefficients are not sbml elements

[janursa]

Following on the previous issue, i try this with the new version, and it works,
model = """
x = 1;
y = 10;
k = .1;
x_y = 0;
n=10;
x + n y -> x_y; kxy^n
"""
but, the following gives error,
model['n'] = 2
saying that 'No sbml element exists for symbol 'n''

[luciansmith]

I haven't forgotten this! I'm moving it to the roadrunner issue tracker, as this particular issue involves how roadrunner decides what's a relevant SBML element to provide user access to.