Download e-book for kindle: Advances in Databases and Information Systems: 12th East by Paolo Atzeni, Albertas Caplinskas, Hannu Jaakkola

By Paolo Atzeni, Albertas Caplinskas, Hannu Jaakkola

This ebook constitutes the refereed complaints of the twelfth East eu convention on Advances in Databases and data structures, ADBIS 2008, held in Pori, Finland, on September 5-9, 2008.

The 22 revised papers have been rigorously reviewed and chosen from sixty six submissions. Topically, the papers span a large spectrum of the database and knowledge structures box: from question optimization, and transaction processing through layout how to software orientated subject matters like XML and information at the web.

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Extra resources for Advances in Databases and Information Systems: 12th East European Conference, ADBIS 2008, Pori, Finland, September 5-9, 2008, Proceedings (Lecture Notes ... Applications, incl. Internet/Web, and HCI)

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E. the set of attributes that may be removed) is described by the following functions: rex : ADDR∗ → REQ rvar : ADDR∗ × QName → REQ where REQ = (s : B, t : B, n : B, a : B, v : B, c : B) is a vector of Boolean requirement flags named after the attributes of the model relations (the c flag stands for the whole CC model). The Boolean flags are assigned the value 1 if the corresponding attribute (or set of attributes) is required, 0 if it may be removed. Note that we do not trace the usage of i and f attributes since they are used in every model equation.

The problem is further complicated by the definition of node identity which violates the functional nature of the XQuery language. This paper presents a novel mathematical model of XQuery execution that reflects temporary tree construction and manipulation, including navigation. Using this model as reference, an efficient algorithm of static analysis is presented that determines the level of information required at a particular place of the XQuery program. As a side effect, the algorithm also decides on the ordered/unordered context as defined by the XQuery language.

The problem is further complicated by the definition of node identity which violates the functional nature of the XQuery language. This paper presents a novel mathematical model of XQuery execution that reflects temporary tree construction and manipulation, including navigation. Using this model as reference, an efficient algorithm of static analysis is presented that determines the level of information required at a particular place of the XQuery program. As a side effect, the algorithm also decides on the ordered/unordered context as defined by the XQuery language.

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