The model contains one compartment called C. There are three species called S1, S2 and S3 and two parameters called k1 and k2. Compartment C is 0-dimensional. The model contains two reactions defined as:

Reaction Rate
S1 + S2 → S3 k1 · S1 · S2
S3 → S1 + S2 k2 · S3

The model contains two events that assign values to species S2 and S1:

Trigger Delay Assignments
Event1 S1 < 0.65 8 S2 = 1
Event2 S3 > 1.2 12 S1 = 1

The initial conditions are as follows:

Value Units
Initial amount of S1 1.0 mole
Initial amount of S2 2.0 mole
Initial amount of S3 1.0 mole
Value of parameter k1 0.075 mole-1 second-1
Value of parameter k2 0.025 second-1

In this example the compartment has its spatialDimensions attribute set to zero; i.e., it represents a point and therefore cannot have size or units. The species values must be treated as amounts and not concentrations.