Main schema-external schema interaction in hierarchically organized data bases

Authors:
A. G. Dale;N. B. Dale
Affiliations:
The University of Texas, Austin;The University of Texas, Austin
Venue:
SIGMOD '77 Proceedings of the 1977 ACM SIGMOD international conference on Management of data
Year:
1977

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Abstract

A class of external schemas derivable from a tree structured main schema is identified. It is shown that the properties of this class of schemas permit the construction of a processing interface such that predicates defined on an external schema can be evaluated in an occurrence structure disciplined by the main schema.