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- W2028052145 abstract "To eliminate semantic conflicts among the heterogeneous databases involved in a cooperation, a set of correspondence assertions for declaring their semantic relationships have to be constructed by DBAs or by users. Normally, four set relationships between object classes: equivalence, inclusion, intersection, and exclusion will be defined to provide knowledge about correspondences that exist among the local schemas. In this paper, we would like to introduce a new assertion, the so-called derivation assertion, to accommodate more heterogeneities, which can not be treated by the existing methodologies. As an example, consider two local object-oriented schemas: S/sub 1/ and S/sub 2/ and assume that S/sub 1/ contains two classes: parent and brother, and S/sub 2/ contains a class: uncle. A derivation assertion of the form: S/sub l/(parent, brother)/spl rarr/S/sub 2/(uncle) can specify their corresponding semantic relationship clearly, which can not be established otherwise. We claim that this kind of assertions is necessary for the following reason. Imagine a query concerning uncle, submitted to the integrated schema from S/sub 1/ and S/sub 2/. If the above assertion is not specified, the query evaluation will not take schema S/sub 1/ into account and thus the answers to the query can not be correctly computed in the sense of cooperations." @default.
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- W2028052145 date "1999-01-01" @default.
- W2028052145 modified "2023-09-23" @default.
- W2028052145 title "Integrating heterogeneous OO schemas" @default.
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- W2028052145 doi "https://doi.org/10.1109/icde.1999.754909" @default.
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