. A node class is a class that,
. Relies on the base class for services and implementation,
. Provides a wider interface to te users than its base class,
. Relies primarily on virtual functions in its public interface
. Depends on all its direct and indirect base class
. Can be understood only in the context of the base class
. Can be used as base for further derivation
. Can be used to create objects.
A node class is a class that has added new services or functionality beyond the services inherited from its base class.