By Elisa Bertino, Stavros Christodoulakis, Dimitris Plexousakis, Christophides Vassilis

This publication constitutes the refereed court cases of the ninth foreign convention on Extending Database expertise, EDBT 2004, held in Heraklion, Crete, Greece, in March 2004. The forty two revised complete papers awarded including 2 business program papers, 15 software program demos, and three invited contributions have been rigorously reviewed and chosen from 294 submissions. The papers are equipped in topical sections on allotted, cellular and peer-to-peer database structures; facts mining and information discovery; reliable database platforms; cutting edge question processing innovations for XML information; info and knowledge on the internet; question processing recommendations for spatial databases; foundations of question processing; complex question processing and optimization; question processing thoughts for info and schemas; multimedia and quality-aware structures; indexing thoughts; and obscure series development queries.

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These data sources may be databases managed by Database Management Systems (DBMSs), or they could be data warehoused in a repository from multiple data sources. The advent of the World Wide Web (WWW) in the mid 1990s has resulted in even greater demand for managing data, information, and knowledge effectively. There is now so much data on the web that managing them with conventional tools is becoming almost impossible. As a results, to provide interoperability as well as warehousing between multiple data sources and systems, and to extract information from the databases and warehouses on the web, various tools are being developed.

In addition, due to the large volumes of data, techniques for integrating database management technology with mass storage technology are also needed. Maintaining the integrity of the data is critical. Since the data may originate from multiple sources around the world, it will be difficult to keep tabs on the accuracy of the data. Appropriate data quality maintenance techniques need thus be developed. Other data management functions include integrating heterogeneous databases, managing multimedia data, and mining.

The next step is securing RDF. Now with RDF not only do we need secure XML, we also need security for the interpretations and semantics. For example, under certain contexts, portions of the document may be Unclassified while under certain other context the document may be Classified. As an example, one could declassify an RDF document, once the war is over. Once XML and RDF have been secured the next step is to examine security for ontologies and interoperation. That is, ontologies may have security levels attached to them.

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