Applications access data using data management programs generated from data definitions and business rules held in the repository.
2.
There was also a Word Processor and a data management program which was also accessible from the Control Program.
3.
Applications are independent of data structures, formats and locations and access the data by issuing requests to the data management programs.
4.
When definitions and rules change the data management programs require regeneration but the applications that use the data require no change.
5.
The data management programs know about the structure and relationships of the database and the business rules that control create, read, update and delete actions.
6.
But all the rest are either mainframe software providers dragged kicking and screaming into the new world order; or vendors of relational database software offering client-server applications to run atop their data management programs.
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