By Elisa Bertino, Stavros Christodoulakis, Dimitris Plexousakis, Christophides Vassilis
This ebook constitutes the refereed complaints of the ninth overseas convention on Extending Database know-how, EDBT 2004, held in Heraklion, Crete, Greece, in March 2004. The forty two revised complete papers awarded including 2 commercial software papers, 15 software program demos, and three invited contributions have been conscientiously reviewed and chosen from 294 submissions. The papers are prepared in topical sections on allotted, cellular and peer-to-peer database platforms; facts mining and data discovery; reliable database structures; leading edge question processing options for XML facts; information and data on the internet; question processing options for spatial databases; foundations of question processing; complex question processing and optimization; question processing concepts for information and schemas; multimedia and quality-aware platforms; indexing strategies; and obscure series development queries.
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In addition, we advocate building a hierarchical organization of nodes by clustering together nodes with similar content. Similarity between nodes is related to the similarity between the corresponding filters. We also present an efficient method for update propagation. Our experimental results show that multi-level Bloom filters outperform the classical Bloom filters in routing path queries. Furthermore, the content-based hierarchical grouping of nodes increases recall, that is, the number of documents that are retrieved.
A formal version has been proposed [Je99]. 2 Agents There is an interesting research area concerning the generality or specificity of agents. Agents could be specialised for a particular task or generalised and configured dynamically for the task by metadata. Furthermore, agents may well need to be reactive and dynamically reconfigured by events / messages. This would cause a designer to lean towards general agents with dynamic configuration, but there are performance, reliability and security issues.