use Deserialize;
use Serialize;
use crateEntity;
// Cluster the entities and value objects into aggregates and define boundaries around each.
// Choose one entity to be the root of each aggregate, and allow external objects to hold
// references to the root only (references to internal members passed out for use within
// a single operation only). Define properties and invariants for the aggregate as a whole and
// give enforcement responsibility to the root or some designated framework mechanism.