A unified architecture for data and message management
Georges Gardarin · 1979 International Workshop on Managing Requirements Knowledge (MARK) · 1979
The ANSI/X3/SPARC study group on data bases has proposed a general architecture for a data base management system. 2 The keystone of this architecture is the conceptual schema which is an explicit description of the enterprise informations modelled in the data base. It portrays the entities, properties and relationships of interest in the enterprise and constitutes a stable platform in order to map the external schemas which describe the data, as seen by the programmers, onto the internal one which defines the data as seen by the system. Finally the ANSI/X3/SPARC DBMS study group envisions a three-level organization which induces three levels of administration functions, three levels of schema processors and three levels of data manipulation modules. This architecture is partially represented Figure 1 . It should be noted that only functions are specified, not their implementation. 24