Ubiquitous Computing and Communication Journal
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Abstract
Title: A SET-THEORETIC DATA MODEL FOR EVOLVING DATABASE ENVIRONMENTS
Authors: Mr. E. J. Yannakoudakis, Mr. P. K. Andrikopoulos
Abstract:
The paper presents an integrated set-theoretic data model that offers a framework
for defining a unified schema for any database environment. We utilise the concepts
”entity” in its classical meaning, ”tag” as a set of properties (attributes) which can
describe an entity, ”subtag” as a set of simple atomic attributes which cannot be
decomposed further, ”domain” as a set of well-defined values that can be derived
from pre-specified data types, ”language”, ”vocabulary” and ”message” as strings
or coded values that represent human languages and corresponding messages. The
model described can manage efficiently changes that occur at the logical level and
supports operations and functions that offer solutions to well-known problems faced
by database designers and programmers alike. Typical problems solved include the
retention of multiple schema versions, the maintenance of authority files, the support
of repeatable attributes, the processing of multilingual databases (at both data and
interface levels).