Where are the SBML Level 1 models?
There aren’t any. Because SBML Level 1 doesn’t have the “hasOnlySubstanceUnits” flag on the species element, there isn’t really a nice way to represent discrete stochastic models correctly and unambiguously in a clean way in SBML Level 1. We recommend that people interested in discrete stochastic simulation forget about SBML Level 1 and concentrate support on SBML Level 2 and beyond.