Information capability of a database schema. (English) Zbl 0649.68117

Summary: The power set of the attribute set \(\{A_ 1,...,A_ m\}\), where \(A_ 1,...,A_ m\) constitute “the kernel” of the conceptual schema of a database, can be partially ordered so that
(i) the power set with this partial ordering creates a lattice,
(ii) two other lattices can be derived if the kernel is enriched with attribute sets “informationally equivalent” with subsets of the kernel, and an analogous partial ordering is applied to the resulting set of equivalence classes of attribute sets,
(iii) the partial ordering in all the three above kinds of lattice can be paralleled with the partial ordering of “semantic information”.


68P20 Information storage and retrieval of data
68P05 Data structures
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