Download Advances in Databases and Information Systems: 12th East by Paolo Atzeni, Albertas Caplinskas, Hannu Jaakkola PDF

By Paolo Atzeni, Albertas Caplinskas, Hannu Jaakkola

This booklet constitutes the refereed court cases of the twelfth East ecu convention on Advances in Databases and knowledge 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 data structures box: from question optimization, and transaction processing through layout ways to program orientated issues like XML and knowledge at the web.

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There is a handful of related model variants: The canonical model exactly reflects the evaluation defined by the XQuery standard, other models are used to reduce the cost of evaluation by reducing the space of sequences and/or their tree environments. Optimized models are applied in the locations of the XQuery program determined by the backward analysis algorithm presented in this paper. e. sets of tuples. e. attributes are either hierarchical strings or atomic values from the XML universe of simple types.

E. against the flow of the ex relations, or upwards, towards the definition of variables. Since the projection operators may move in both directions, the possibility to shrink a model strongly depends on the context where the expression is evaluated. In a user-defined function, it may depend on the context where the function was called. More precisely, available model reduction depends on the i attribute of the inv relation (note that the reducibility does not depend on the f attribute). 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).

A sequence is modeled using a mapping of sequence identifiers to sequence items. – Each sequence containing nodes is accompanied by a tree environment which contains the encoding of the trees to which the nodes of the sequence belong. – Evaluating a for-expression corresponds to iteration through all sequence identifiers in the value of the in-clause. – A particular context reached during XQuery evaluation is identified by the pair of a call stack, containing positions in the program code, and a control variable stack, containing sequence identifiers selected by the for-expressions along the call stack.

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