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DBPL
1993
Springer
141views Database» more  DBPL 1993»
13 years 11 months ago
Some Properties of Query Languages for Bags
In this paper we study the expressive power of query languages for nested bags. We de ne the ambient bag language by generalizing the constructs of the relational language of Brea...
Leonid Libkin, Limsoon Wong
CSL
2004
Springer
14 years 1 months ago
The Boundary Between Decidability and Undecidability for Transitive-Closure Logics
To reason effectively about programs, it is important to have some version of a transitive-closure operator so that we can describe such notions as the set of nodes reachable from ...
Neil Immerman, Alexander Moshe Rabinovich, Thomas ...
APSEC
2007
IEEE
14 years 2 months ago
1st International Workshop on Software Patterns and Quality (SPAQu'07)
Although numbers of software pattern catalogues and languages have been published, little is known about quality of patterns, quality by patterns and quality aspects of pattern ac...
Hironori Washizaki, Nobukazu Yoshioka
ICDT
2001
ACM
131views Database» more  ICDT 2001»
14 years 2 days ago
Query Evaluation via Tree-Decompositions
A number of efficient methods for evaluating first-order and monadic-second order queries on finite relational structures are based on tree-decompositions of structures or quer...
Jörg Flum, Markus Frick, Martin Grohe
ESOP
2000
Springer
13 years 11 months ago
Type Classes with Functional Dependencies
Abstract. Type classes in Haskell allow programmers to define functions that can be used on a set of different types, with a potentially different implementation in each case. For ...
Mark P. Jones