Advances in Database Technology - EDBT 2004: 9th by Richard Hull (auth.), Elisa Bertino, Stavros
By Richard Hull (auth.), Elisa Bertino, Stavros Christodoulakis, Dimitris Plexousakis, Vassilis Christophides, Manolis Koubarakis, Klemens Böhm, Elena Ferrari (eds.)
The ninth overseas convention on Extending Database expertise, EDBT 2004, used to be held in Heraklion, Crete, Greece, in the course of March 14–18, 2004. The EDBT sequence of meetings is a longtime and prestigious discussion board for the trade of the most recent study leads to info administration. Held each years in an enticing ecu situation, the convention offers special opp- tunities for database researchers, practitioners, builders, and clients to discover new rules, options, and instruments, and to interchange reports. the former occasions have been held in Venice, Vienna, Cambridge, Avignon, Valencia, Konstanz, and Prague. EDBT 2004 had the topic “new demanding situations for database technology,” with the objective of encouraging researchers to take a better curiosity within the present interesting technological and alertness developments and to plan and tackle new study and improvement instructions for database expertise. From its early days, database know-how has been challenged and complicated through new makes use of and purposes, and it keeps to conform besides program specifications and advances. Today’s DBMS expertise faces but a number of new demanding situations. Technological developments and new computation paradigms, and purposes reminiscent of pervasive and ubiquitous computing, grid computing, bioinformatics, belief administration, digital groups, and electronic asset administration, to call quite a few, require database expertise to be deployed in various environments and for a few di?erent reasons. Such an intensive deployment also will require reliable, resilient database structures, in addition to easy-to-manage and ?exible ones, to which we will entrust our information in no matter what shape they are.
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Extra resources for Advances in Database Technology - EDBT 2004: 9th International Conference on Extending Database Technology, Heraklion, Crete, Greece, March 14-18, 2004
Thuraisingham documents are secure. This would involve securing XML from a syntactic point of view. However with RDF we also need to ensure that security is preserved at the semantic level. The issues include the security implications of the concepts resource, properties and statements that are part of the RDF speciﬁcation. That is, how is access control ensured? How can one provide access control at a ﬁne granularity level? What are the security properties of the container model? How can bags, lists and alternatives be protected?
Furthermore, the ﬁlter comparison operation is more eﬃcient than a direct comparison between sets of documents. As our experimental results show, the content-based organization is very eﬃcient in retrieving a large number of relevant documents, since it beneﬁts from the content clusters that are created when forming the network. In summary, the contribution of this paper is twofold: (i) it proposes using ﬁlters for routing path queries over distributed collections of schema-less XML documents and (ii) it introduces overlay networks over XML documents that cluster nodes with similar documents, where similarity between documents is related to the similarity between their ﬁlters.
Unstructured P2P systems can be further distinguished between systems that use indexes and those that are based on ﬂooding and its variations. With ﬂooding (such as in Gnutella ), a node searching for a document contacts its neighbor nodes which in turn contact their own neighbors until a matching node is reached. Flooding incurs large network overheads. In the case of indexes, these can be either centralized (as in Napster ), or distributed among the nodes (as in routing indexes ) providing for each node a partial view of the system.