By Jan Van den Bussche (auth.), Jürgen Dix, Stephen J. Hegner (eds.)
This booklet constitutes the refereed complaints of the 4th overseas Symposium on Foundations of knowledge and data structures, FoIKS 2006 held in Budapest, Hungary in February 2006.
The 14 revised complete papers awarded including 3 revised brief papers and one invited paper have been conscientiously reviewed and chosen from fifty four submissions.
Among the subjects lined are the theoretical foundations of knowledge and information structures, in addition to mathematical fields similar to discrete arithmetic, combinatorics, logics and finite version idea, and functions thereof for learn on database and data base theory.
Read or Download Foundations of Information and Knowledge Systems: 4th International Symposium, FoIKS 2006, Budapest, Hungary, Februrary 14-17, 2006. Proceedings PDF
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J. Chomicki and D. Toman. Temporal logic in information systems. In J. Chomicki and G. Saake, editors, Logics for Databases and Information Systems, chapter 1. Kluwer, 1998. 11. O. Etzion, A. Gal, and A. Segev. Extended update functionality in temporal databases. In O. Etzion, S. Jajodia, and S. Sripada, editors, Temporal Databases - Research and Practice, Lecture Notes in Computer Science, pages 56–95. Springer-Verlag, 1998. 12. M. Finger and P. McBrien. Temporal conceptual-level databases. In D.
DEXC1 ,C2 ⊕ ¬ DEXC1 ,C2 ¬DEXC1 ,C2 (similar for DEVC1 ,C2 ) B(t) B(t) B(t+1) B(t+1) Indeed, let o ∈ DEXC1 ,C2 , then o ∈ C2 and o ∈ C2 , thus o ∈ DEXC1 ,C2 B(t−1) 2. 3. 4. 5. 6. B(t) and o ∈ DEXC1 ,C2 . Note that, the time t such that o ∈ DEXC1 ,C2 records when the transition event happens. Similar considerations apply for DEVC1 ,C2 . Objects in the classes DEXC1 ,C2 and DEVC1 ,C2 cannot be disabled as C2 . e. objects in DEXC1 ,C2 are active in C2 starting from the next point in time, then by property (D ISAB 3), DEXC1 ,C2 ¬Disabled-C2 .
A knowledge base is a finite set Σ of DLRU S axioms of the form C1 C2 and R1 R2 , with R1 and R2 being relations of the same arity. e. C1 ⊆ C2 (R1 ⊆ R2 ), for all t ∈ T . Various reasoning services can be defined in DLRU S . A knowledge base, Σ, is satisfiable if there is an interpretation that satisfies all the axioms in Σ (in symbols, I |= Σ). A class C (or relation R) is satisfiable if there is I such that C I(t) = ∅ (respectively, RI(t) = ∅), for some time point t. A knowledge base, Σ, logically implies an axiom, C1 C2 , and write Σ |= C1 C2 , if we have I |= C1 C2 whenever I |= Σ.