Technical Reports (CIS)

Document Type

Technical Report

Date of this Version

April 1971


University of Pennsylvania Department of Computer and Information Science Technical Report No. MS-CIS-71-20.


A Data Description Language (DDL) for describing the organizations of data in files and data bases, is specified. This language has been developed as part of a utility which will process data bases or data files, with existing formats and organizations, and which will produce these data in new desired forms.

The DDL is sufficiently rich and expressive to be readily used to describe the organization of existing data bases, the structure of desired data bases and the transformations between the existing ones to the desired ones. The DDL is specified in the form of an extensive manual containing specifications and a set of detailed examples of the use of the DDL.


data description, data structure, storage structure, interfacing, file integration, data extraction, data base, data conversion, file, record



Date Posted: 08 January 2008