Interpretation
of species' constant and boundaryCondition
attributes.
 
     | constantvalue
 | boundaryConditionvalue
 | Can have assignment
 or rate rule?
 | Can be reactant
 or product?
 | Species' quantity can be changed by
 | 
 
     | true | true | no | yes | (never changes) | 
 
     | false | true | yes | yes | rules and events | 
 
     | true | false | no | no | (never changes) | 
 
     | false | false | yes | yes | reactions or rules (but not both at the same time), and events |