NDLI: A data abstraction approach to database modelling (SGMD, Vol. 11, Issue. 2)

Content Provider	ACM Digital Library
Author	Leavenworth, B.
Abstract	Attempts have been made for some time to reconcile the notions of data base modelling and data abstraction. Considering the overlapping concepts of information hiding and encapsulation from the data abstraction world, and data independence from the database world, it should not be necessary to design yet another programming language as others have done, specialized to a particular data model. Instead, the starting point for our work has been the proposition that an extant general purpose language providing data abstractions should be able to accommodate the popular data models by serving both as a data definition and manipulation language. The criticism has been made that while abstract data types hide the representation details, they also suppress the semantic structure of the data. While this may be true for “programming in the small” [2], it is not the case for “programming in the large” [2]. We will briefly indicate how a CLU-like language [4] (hereafter called XPLS) with minor extensions, plus its supporting module interconnection language (hereafter called the External Structure) can be used as a data-base definition and manipulation language. XPLS has been designed as a front end to PL/I and is supported by a preprocessor to the PL/I compiler. It turns out that XPLS plus External Structure supports and meshes more smoothly with a semantic data model (for example: [1], [3],[5], [6]) than with the older data models. Our work differs from a number of recent specialized languages which exploit data abstractions and strong type checking but which are based on the relation as a primitive data type. Our approach is not based on any particular data model.
Starting Page	147
Ending Page	149
Page Count	3
File Format	PDF
ISSN	01635808
DOI	10.1145/960126.806904
Journal	ACM SIGMOD Record (SGMD)
Volume Number	11
Issue Number	2
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1999-06-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Information Systems Software

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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