Once the DBMS had been chosen, then a logical model would be produced. The logical model was normally expressed as a schema in textual form. So, for instance, where the solution was to be implemented using a relational database, a relational schema would be produced. This consisted of a set of relations, the relationships expressed as foreign key constraints, and a set of domains from which the attributes of the relations would draw their values.
Once the DBMS had been chosen, then a logical model would be produced. The logical model was normally expressed as a schema in textual form. So, for instance, where the solution was to be implemented using a relational database, a relational schema would be produced. This consisted of a set of relations, the relationships expressed as foreign key constraints, and a set of domains from which the attributes of the relations would draw their values.