(1) prescriptions that arise from the relational model, called RM Prescriptions;
(2) prescriptions that do not arise from the relational model, called Other Orthogonal
(OO) Prescriptions (OO Prescriptions);
(3) proscriptions that arise from the relational model, called RM Proscriptions;
(4) proscriptions that do not arise from the relational model, called OO Proscriptions.