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Inferring the Principal Type and the Schema Requirements of an OQL Query

By A. Trigoni and G.M. Bierman


In this paper, we present an inference algorithm for OQL which both identifies the most general type of a query in the absence of schema type information, and derives the minimum type requirements a schema should satisfy to be compatible with this query. Our algorithm is useful in any database application where heterogeneity is encountered, for example, schema evolution, queries addressed against multiple schemata, inter-operation or reconciliation of heterogeneous schemata

Publisher: Springer Verlag
Year: 2001
OAI identifier: oai:CiteSeerX.psu:
Provided by: CiteSeerX
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