Accession Number : ADA181955

Title :   Integrated Information Support System (IISS). Volume 5. Common Data Model Subsystem. Part 7. NDDL User's Guide.

Descriptive Note : Final rept. 22 Sep 80-31 Jul 85,

Corporate Author : GENERAL ELECTRIC CO SCHENECTADY NY PRODUCTION RESOURCES CONSULTING

Personal Author(s) : Althoff,J L ; Apicella,M L ; Bernier,M P ; Singh,S ; Thompson,D B

PDF Url : ADA181955

Report Date : 01 Nov 1985

Pagination or Media Count : 139

Abstract : 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).

Descriptors :   *DATA PROCESSING EQUIPMENT, *USER MANUALS, DATA MANAGEMENT, MODELS, COMPUTER AIDED MANUFACTURING, INTEGRATED SYSTEMS, NEUTRAL, COMPUTER PROGRAMS, DATA BASES, SEMANTICS, SYNTAX, INFORMATION RETRIEVAL, DATA PROCESSING

Subject Categories : Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE