In SBML Level 3 Version 1,
RateRules are used to assign values or change of values respectively to variables of a model, that are
SpeciesReference, or global
Parameters. In order to assign the value of a specific type of species,
RateRules in multi Version 1 also contain an element
SpeciesTypeInstanceChange. The assignment sets the quantity of instances that fulfill a certain selection using the mathematical expression provided.
In order to assign values, or value evolutions, to entity subpools, defined by specific state and connectivity, the elements
RateRule of SBML Level 3 Version 1 core are linked to a
For a definition of
SpeciesTypeInstanceChange, see section 2.5.2.