By Elisa Bertino, Stavros Christodoulakis, Dimitris Plexousakis, Christophides Vassilis
This ebook constitutes the refereed court cases 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 provided 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 disbursed, cellular and peer-to-peer database platforms; facts mining and data discovery; reliable database structures; leading edge question processing ideas for XML info; information and data on the internet; question processing innovations for spatial databases; foundations of question processing; complicated question processing and optimization; question processing innovations for facts and schemas; multimedia and quality-aware platforms; indexing options; and vague series development queries.
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Some issues on developing a secure semantic web will be discussed in Section 5. The paper is concluded in Section 6. 2 Background on Web Database and Services This paper focuses on security and privacy for web databases and services and therefore in this section we provide some background information about them. 1 Web Data Management A major challenge for web data management is coming up with an appropriate data representation scheme. The question is: is there a need for a standard data model? Is it at all possible to develop such a standard?
For example, query rpocessing algorithms may need to take into consideration the access control policies. We also need to examine the trust that must be placed in the modules of the query processor. Transaction management algorithms may also need to consider the security policies. For example, the transaction will have to ensure that the integrity as well as security constraints are satisfied. We need to examine the security impact in various indexing and storage strategies. For example, how Security and Privacy for Web Databases and Services 21 do we store the databases on the web that will ease the enforcement of security policies?
If a third-party architecture is adopted, the access control mechanism must reside at the discovery agency site. However, the drawback of this solution is that the discovery agency must be trusted. An alternative approach to relax this assumption is that of using a technique similar to the one proposed in  for the secure broadcasting of XML documents. Basically, the idea is that the service provider encrypts the entries to be published in an UDDI registry according to its access control policies: all the entry portions to which the same policies apply are encrypted with the same key.