Download e-book for iPad: Foundations of Information and Knowledge Systems: Third by Georg Gottlob (auth.), Dietmar Seipel, José María

By Georg Gottlob (auth.), Dietmar Seipel, José María Turull-Torres (eds.)

ISBN-10: 3540209654

ISBN-13: 9783540209652

ISBN-10: 3540246274

ISBN-13: 9783540246275

This publication constitutes the refereed complaints of the 3rd foreign Symposium on Foundations of data and data platforms, FoIKS 2004 held at Wilheminenburg fortress, Austria in February 2004.

The 18 revised complete papers offered including 2 invited papers have been conscientiously reviewed and chosen from sixty four submissions. one of the issues coated are facts integration, info defense, good judgment programming and databases, relational reasoning, database queries, higher-order info types, updates, database perspectives, OLAP, trust modeling, fixpoint computations, interplay schemes, plan databases, etc.

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Additional resources for Foundations of Information and Knowledge Systems: Third International Symposium, FoIKS 2004 Wilheminenburg Castle, Austria, February 17-20, 2004 Proceedings

Example text

1. Let Σ be a weakest precondition of constraint theory Γ with respect to an update U . Then Optimize∆ (Σ), ∆ a constraint theory, is a ∆OCWP of Γ with respect to U . The operators introduced so far can be combined to define a procedure for simplification of integrity constraints, where the updates always take place from a consistent state. 12. For a constraint theory Γ and an update U , we define SimpU (Γ ) = OptimizeΓ (AfterU (Γ )). As a consequence of the previous results, Simp enjoys the following property.

1 = (sp : t, sq : f ) and ν2 = (sp : f, sq : t). The database updates that are induced by these valuations are, respectively, Rν1 = ({}, {p}) and Rν2 = ({q}, {}). 1 below, these are the only ≤i -preferred repairs of DB. 1. Let DB = (D, IC) be a database and IC = {ψ | ψ ∈ IC}. Then: a) if R is an ≤i -preferred repair of DB then ν R is a model of IC ∪ ΨDB , b) if ν is a model of IC ∪ ΨDB then Rν is an ≤i -preferred repair of DB. Proof. Suppose that R = (Insert, Retract) is an ≤i -preferred repair of DB.

A test that can be checked in the present state but indicating properties of the prospective new state. 36 H. Christiansen and D. 4 (Weakest precondition, strongest postcondition). Let Γ and Σ be constraint theories and U an update. Σ is a weakest precondition of Γ with respect to U and Γ is a strongest postcondition of Σ with respect to U whenever D(Σ) ≡ (D ∪ U )(Γ ) for any database state D. Weakest preconditions [14,18] resemble the standard axiom for defining assignment statements in a programming language, whose side effects are analogous to a database update.

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Foundations of Information and Knowledge Systems: Third International Symposium, FoIKS 2004 Wilheminenburg Castle, Austria, February 17-20, 2004 Proceedings by Georg Gottlob (auth.), Dietmar Seipel, José María Turull-Torres (eds.)


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