By Heikki Mannila (auth.), Paolo Atzeni, Albertas Caplinskas, Hannu Jaakkola (eds.)
This ebook constitutes the refereed court cases 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 conscientiously reviewed and chosen from sixty six submissions. Topically, the papers span a large spectrum of the database and knowledge structures box: from question optimisation, and transaction processing through layout ways to program orientated issues like XML and information at the web.
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On the other hand, the sequence identiﬁers s are used as edge labels in the output document – they may be found in the ﬁnal output of the program shown at Fig. 3. Most XQuery operators do not change the assignment of variable values. However, in our model, the values carry the i attribute which determines the place where the value is examined. env) for-expression and function call are an exception from this rule; their jmp and var equations are shown below. env contain the same tree identiﬁer t, the corresponding tree information is merged via setunion.
The system is open – new models may be added under the same notation and corresponding algorithms can be reused. The canonical model described in the paper is used to reﬂect the deﬁnition of the XQuery semantics as closely as possible. It would be natural to prove the equivalence between our canonical model and the normative XQuery semantics; unfortunately, some of the most interesting parts of XQuery semantics, namely the eﬀect of the order-by clause and the identity of constructed nodes, are described only informally, although under the title “Formal Semantics” .
The trees in which the nodes of the corresponding sequence are contained. seqa from the deﬁnitions shown below, for brevity. E for some j). f is the stack of sequence identiﬁers selected by the for-clauses throughout the descent along i. The two stacks together form the identiﬁcation of the dynamic context in which an expression is evaluated. While the XQuery standard deﬁnes dynamic context as the set of variable assignments (with some negligible additions), our notion of dynamic context is based on the stack pair that determines the descent through the code to the examined expression, combining both the code path stored in i and the for-control variables in f .