Integrated Information Support System (IISS). Volume 5. Common Data Model Subsystem. Part 7. NDDL User's Guide.
Final rept. 22 Sep 80-31 Jul 85,
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The Common Data Model Processor CDMP is a mechanism by which applications programs can retrieve and update data without knowing where or how the data are stored. The CDMP relies on three types of schemas conceptual, external, and internal and on two types of schema mappings conceptual-to-external and conceptual-to-internal. A schema is a description of data from a particular viewpoint. A mapping is a description of the correspondence between elements of one schema and those of another. The schemas and mappings are stored in a database, called the Common Data Model CDM, where they are available to the CDMP software. The Neutral Data Definition Language NDDL is the means for storing and maintaining the schemas and mappings in the CDM database. This manual explains the syntax and semantics of each NDDL command. Keywords ICAM Integrated Computer Aided Manufacturing.
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