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I. Feinerer, R. Pichler, E. Sallinger, V. Savenkov:
"On the undecidability of the equivalence of second-order tuple generating dependencies";
Information Systems, 48 (2015), 113 - 129.

Second-order tuple generating dependencies (SO tgds) were introduced by Fagin et al. to capture the composition of simple schema mappings. Testing the equivalence of SO tgds would be important for applications like model management and mapping optimization. However, we prove the undecidability of the logical equivalence of SO tgds. Moreover, under weak additional assumptions, we also show the undecidability of a relaxed notion of equivalence between two SO tgds, namely the so-called conjunctive query equivalence.

Schema mapping optimization; Database dependencies; Data integration; Data exchange

http://dx.doi.org/10.1016/j.is.2014.09.003

Project Head Reinhard Pichler:
Heterogene Information Integration

Project Head Reinhard Pichler:
SEE: SPARQL Evaluation and Extensions