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By Denilson Barbosa, Angela Bonifati, Zohra Bellahsène, Ela Hunt, Rainer Unland

This e-book constitutes the refereed complaints of the fifth foreign XML Database Symposium, XSym 2007, held in Vienna, Austria, in September 2007 at the side of the overseas convention on Very huge information Bases, VLDB 2007.

The eight revised complete papers including 2 invited talks and the prolonged summary of one panel consultation have been rigorously reviewed and chosen from 25 submissions. overlaying all present points of middle database know-how for XML facts administration, XML and knowledge integration, and improvement and deployment of XML purposes, the papers are geared up in topical sections on XPath question answering, XQuery review and function, in addition to XML updates, temporal XML facts and concurrency.

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Extra resources for Database and XML Technologies: 5th International XML Database Symposium, XSym 2007, Vienna, Austria, September 23-24, 2007, Proceedings

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The workload APEX considers are expressions containing a number of child axis composition that may be preceded by a descendant axis, without any predicate. e. SDs defined by the p∗ AxPRE) and does not provide an explicit description of the extents, whereas DescribeX supports arbitrary AxPRE’s. Regarding summaries that capture document order, the only proposals we are aware of are the earlier region order graphs (ROGs) [7] and the Skeleton summary [4,3]. ns∗ )∗ AxPRE. Other summaries are augmented with statistical information of the instance for selectivity estimation, including path/branching distribution (XSketch [21]), value distributions [20], and additional statistical information for approximate query processing [22].

ACM Transactions on Database Systems (TODS) 31(3), 1014–1063 (2006) 22. : Approximate XML query answers. In: SIGMOD, pp. 263–274 (2004) 23. : D(k)-index: An adaptive structural summary for graph-structured data. In: SIGMOD, pp. 134–144 (2003) 24. : Indexing XML data with ToXin. In: WebDB, pp. de Abstract. To globally optimize execution plans for XQuery expressions, a plan generator must generate and compare plan alternatives. In proven compiler architectures, the unit of plan generation is the query block.

However, according to Definition 4, they are bisimilar and thus nodes 18 and 24 belong to the same extent (that of node s62 in Figure 2 (b)). f s (24). Consequently, node 6 is assigned to a different extent (that of node s61 in Figure 2 (b)). A bisimulation provides a way of computing a double homomorphism between graphs. The widespread use of bisimulation in summaries is motivated by its relatively low computational complexity properties. The bisimulation reduction of a labelled graph can be done in time O(m log m) (where m is the number of edges in a labelled graph) as shown in [19], or even linearly for acyclic graphs, as shown in [10].

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