Partial compartment model with variable volume. Note that the model is underdetermined. An equation defining the dynamics of the variable "V" needs to be added as an equation in the "Text View" of the compartment model.
The model also includes a SBML-specific parameter "mainCompartment" used to specify whether or not the compartment is a main (top-level) compartment. The parameter is found under the "SBML" tab.
Description: Specifies whether the compartment is a main (top-level) compartment. Used in SBML import/export.