Why restrict the modelling capability of CODASYL data structure sets?

Authors:
Charles W. Bachman
Affiliations:
Honeywell Information Systems, Billerica, Massachusetts
Venue:
AFIPS '77 Proceedings of the June 13-16, 1977, national computer conference
Year:
1977

Citing 2
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Data structure diagrams

ACM SIGMIS Database
A general purpose programming system for random access memories

AFIPS '64 (Fall, part I) Proceedings of the October 27-29, 1964, fall joint computer conference, part I

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Abstract

Several issues have been raised concerning changes to the capabilities of the CODASYL Data Description Language specifications for data structure sets. The paper argues against new restrictions suggested and for removal of existing restrictions. The issues are: allow recursive set declaration keep multiple member declaration allow alternate owner declarations The concept of "record-roles" is introduced to justify the need for these capabilities. The expanded capabilities described offer an alternate means of achieving the same end result without the need to introduce the "record-role" into the CODASYL Data Description Language.