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Published in:
2005 | OriginalPaper | Chapter
On Modal Deductive Databases
Author : Linh Anh Nguyen
Published in: Advances in Databases and Information Systems
Publisher: Springer Berlin Heidelberg
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We present a query language called MDatalog, which is an extension of Datalog for multimodal deductive databases. We define modal relational algebras and give the seminaive evaluation algorithm and the magic-set transformation for MDatalog queries. Results of this paper are proved for the multimodal logics of belief
KDI
4
s
5,
KDI
45,
KD
4
s
5
s
,
KD
45
(
m
)
, which are extensions of the monomodal logic
KD
45. We show that MDatalog has PTIME data complexity in these logics.