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» Weighted monadic datalog
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TCS
2008
13 years 4 months ago
Weighted monadic datalog
Torsten Stüber, Heiko Vogler
LICS
2008
IEEE
13 years 10 months ago
Caterpillar Duality for Constraint Satisfaction Problems
The study of constraint satisfaction problems definable in various fragments of Datalog has recently gained considerable importance. We consider constraint satisfaction problems ...
Catarina Carvalho, Víctor Dalmau, Andrei A....
CSL
2003
Springer
13 years 9 months ago
Comparing the Succinctness of Monadic Query Languages over Finite Trees
Abstract. We study the succinctness of monadic second-order logic and a variety of monadic fixed point logics on trees. All these languages are known to have the same expressive p...
Martin Grohe, Nicole Schweikardt
PODS
2007
ACM
171views Database» more  PODS 2007»
14 years 4 months ago
Monadic datalog over finite structures with bounded treewidth
Bounded treewidth and Monadic Second Order (MSO) logic have proved to be key concepts in establishing fixed-parameter tractability results. Indeed, by Courcelle's Theorem we ...
Georg Gottlob, Reinhard Pichler, Fang Wei
PODS
2002
ACM
117views Database» more  PODS 2002»
14 years 4 months ago
Monadic Datalog and the Expressive Power of Languages for Web Information Extraction
Research on information extraction from Web pages (wrapping) has seen much activity in recent times (particularly systems implementations), but little work has been done on formal...
Georg Gottlob, Christoph Koch