The following objects represent quantities in a model:
Scoping refers to which object another object is contained in. Scoping affects compartments, species, parameters, and rules.
A compartment is scoped to (or contained in) a model or another compartment.
Although a model can contain multiple compartments, each species is scoped to only one compartment.
A parameter is scoped to a model or a kinetic law.
Note the following when naming objects within a model:
Compartment names must be unique within a model.
Species in different compartments can have the same name.