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By Hamideh Afsarmanesh, Luis M. Camarinha-Matos (auth.), Sourav S. Bhowmick, Josef Küng, Roland Wagner (eds.)

This e-book constitutes the refereed court cases of the 20 th foreign convention on Database and professional structures functions, DEXA 2009, held in Linz, Austria, in August/September 2009.

The 35 revised complete papers and 35 brief papers provided have been conscientiously reviewed and chosen from 202 submissions. The papers are prepared in topical sections on XML and databases; net, semantics and ontologies; temporal, spatial, and excessive dimensional databases; database and knowledge approach structure, functionality and defense; question processing and optimisation; facts and data integration and caliber; facts and knowledge streams; information mining algorithms; information and data modelling; details retrieval and database structures; and database and knowledge procedure structure and performance.

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Additional info for Database and Expert Systems Applications: 20th International Conference, DEXA 2009, Linz, Austria, August 31 – September 4, 2009. Proceedings

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Finally, Sect. 6 discusses related work. 2 XML Trees, Paths and Reachable Nodes In this section we present some preliminary definitions. First, following the model adopted by XPath and DOM [4], we model an XML document as a tree as follows. We assume countably infinite, disjoint sets E and A of element and attribute labels respectively, and the symbol S indicating text. Thereby, the set of labels that can occur in the XML tree, L, is defined by L = E ∪ A ∪ {S}. Definition 1. An XML tree T is defined by T = (V, E, lab, val, vρ ), where – V is a finite, non-empty set of nodes; – the total function lab : V → L assigns a label to every node in V.

Thereby, for every edge (v, v¯) ∈ E, • v is an element node and is said to be the parent of v¯. Conversely, v¯ is said to be a child of v; • if v¯ is an attribute node, then there does not exist a node v˜ ∈ V and an edge (v, v˜) ∈ E such that lab(˜ v ) = lab(¯ v ) and v˜ = v¯; – the partial function val : V → string assigns a string value to every attribute and text node in V. In addition to the parent of a node v in a tree T, we define its ancestor nodes, denoted by ancestor(v), to be the transitive closure of parents of v.

Conversely, v¯ is said to be a child of v; • if v¯ is an attribute node, then there does not exist a node v˜ ∈ V and an edge (v, v˜) ∈ E such that lab(˜ v ) = lab(¯ v ) and v˜ = v¯; – the partial function val : V → string assigns a string value to every attribute and text node in V. In addition to the parent of a node v in a tree T, we define its ancestor nodes, denoted by ancestor(v), to be the transitive closure of parents of v. An example of an XML tree is presented in Fig. 2, where E = {ρ, offer, teaches, course, info} and A = {cno, day, lec, sem}.

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