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138
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DEDUCTIVE
1994
15 years 4 months ago
1994
Non-deterministic operators are needed in First-Order relational languages and Datalog to extend the expressive power of such languages and support efficient formulations of lowco...
157
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ICDT
1997
ACM
15 years 7 months ago
1997
ACM
Abstract. The goal of this paper is to study tractable iteration mechanisms for bags. The presence of duplicates in bags prevents iteration mechanisms developed in the context of s...
151
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ICGI
2000
Springer
15 years 7 months ago
2000
Springer
A subpansive tree is a rooted tree that gives a partial order of nonterminal symbols of a context-free grammar. We formalize subpansive trees as background knowledge of CFGs, and i...
126
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ICLP
2007
Springer
15 years 9 months ago
2007
Springer
Abstract. The system presented in this paper aims at using Contextual Logic Programming as a computational hub for knowledge modeled by web ontologies and enable querying that repr...
134
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ICDE
1997
IEEE
15 years 7 months ago
1997
IEEE
In this paper we propose a data model for representing moving objects in database systems. It is called the Moving Objects Spatio-Temporal (MOST) data model. We also propose Futur...