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 foreign 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 alternate of the newest examine ends up in facts administration. Held each years in an enticing eu place, the convention presents precise opp- tunities for database researchers, practitioners, builders, and clients to discover new principles, concepts, and instruments, and to replace studies. 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 fascinating technological and alertness developments and to plan and deal with new examine and improvement instructions for database expertise. From its early days, database know-how has been challenged and complex by way of new makes use of and purposes, and it keeps to conform besides program requisites and advances. Today’s DBMS know-how faces but numerous new demanding situations. Technological traits and new computation paradigms, and functions equivalent to 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 quite a few environments and for a few di?erent reasons. Such an in depth deployment also will require reliable, resilient database structures, in addition to easy-to-manage and ?exible ones, to which we will entrust our facts in no matter what shape they are.

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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 Databases 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?

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? Can we specify security policies in RDF? How can we solve semantic inconsistencies for the policies?

The Breadth Bloom Filter (BBF) for an XML tree T with j levels is a set of simple Bloom filters {BBF1 , BBF2 , . . BBFi }, i ≤ j. There is one simple Bloom filter, denoted BBFi , for each level i of the tree. In each BBFi , we insert the elements of all nodes at level i. To improve performance and decrease the false positive probability in the case of i < j, we may construct an additional Bloom filter denoted BBF0 , where we insert all elements that appear in any node of the tree. For example, the BBF for the XML tree in Fig.

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