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208
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PODS
2010
ACM
16 years 6 days ago
2010
ACM
Both semantic and type-based query optimization rely on the idea that queries often exhibit non-trivial rewritings if the state space of the database is restricted. Despite their ...
204
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COLCOM
2009
IEEE
15 years 12 months ago
2009
IEEE
— Sharing personal information and documents is pervasive in Web 2.0 environments, which creates the need for properly controlling shared data. Most existing authorization and po...
223
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ER
2001
Springer
15 years 11 months ago
2001
Springer
Abstract. Conceptual models are formal descriptions of application domains that are used in early stages of system development to support requirements analysis. The Unified Modeli...
158
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SEMWEB
2001
Springer
15 years 11 months ago
2001
Springer
New approaches in the Web environment are underway. These new methodologies try to leverage it from an information medium to a knowledgeable level, from a machine point of view. Th...
196
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AGENTCL
2000
Springer
15 years 11 months ago
2000
Springer
Intelligent agents in the agent language 3APL are computational entities consisting of beliefs and goals which make up their mental state. In this paper, we integrate communicatio...