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an Entity references as follows:
Part of a SQL Relation (i.e. Table) represented by a collection of rows (records), each denoted by a record (typically a Primary Key), that are associated with a class (or category) denoted by the Table name via an implicit "IsA" or "instanceOf" relationship property (playing predicate role). As a consequence, every record identifier in a given Table denotes an instance of the class (or category) denoted by the Table name.