18. The method of claim 17 , wherein the class-specific stored procedure is generated by an initialization module, the initialization module being configured to: use the referential integrity metadata framework to automatically create the table in the relational database system, the table including a column for the identifying attribute, a column for the relationship attribute, and a column for the object data document; and use the referential integrity metadata framework to automatically create referential integrity structures for the table in the relational database system.
18. The method of claim 17 , wherein the class-specific stored procedure is generated by an initialization module, the initialization module being configured to: use the referential integrity metadata framework to automatically create the table in the relational database system, the table including a column for the identifying attribute, a column for the relationship attribute, and a column for the object data document; and use the referential integrity metadata framework to automatically create referential integrity structures for the table in the relational database system. 19. The method of claim 18 , wherein the referential integrity structures include foreign keys and database triggers.