By Denilson Barbosa, Angela Bonifati, Zohra Bellahsène, Ela Hunt, Rainer Unland
This e-book constitutes the refereed complaints of the fifth overseas XML Database Symposium, XSym 2007, held in Vienna, Austria, in September 2007 along with the foreign 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. protecting all present points of middle database know-how for XML info administration, XML and information integration, and improvement and deployment of XML functions, the papers are geared up in topical sections on XPath question answering, XQuery evaluate and function, in addition to XML updates, temporal XML info and concurrency.
Read or Download Database and XML Technologies: 5th International XML Database Symposium, XSym 2007, Vienna, Austria, September 23-24, 2007, Proceedings PDF
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Additional resources for Database and XML Technologies: 5th International XML Database Symposium, XSym 2007, Vienna, Austria, September 23-24, 2007, Proceedings
This can happen because the D. Barbosa et al. ): XSym 2007, LNCS 4704, pp. 31–45, 2007. P. Consens and F. g. ). In these scenarios, schemas alone are not that helpful for understanding (nor for optimizing) XPath evaluation. This paper argues that DescribeX, a tool supporting powerful structural summaries, can help with understanding the (semi)structure of large collections of XML documents. In fact, DescribeX summaries contribute to signiﬁcantly speed up (and scale up) XPath evaluation with existing ﬁle at a time tools, enabling fast exploration of the results of XPath workloads on large collections.
This entails performing a reﬁnement of the extent of the node. For instance, in order to adapt the SD of Figure 2 (a) to query Q2 from Section 2, the extent of s6 was reﬁned into two sets (Figure 2 (b)). An in-depth discussion of reﬁnements is beyond the scope of this paper and can be found in . 5 Document-at-a-time Evaluation Using SDs In the previous section we have shown how to translate any XPath expression into an equivalent AxPRE. In this section we will discuss how this AxPRE can be used to ﬁnd the SD nodes that contain candidate documents.
Consens and F. Rizzolo A few adaptive summaries, like APEX  and D(k)-index , use dynamic query workloads to determine the subset of incoming paths to be summarized. APEX uses an ad-hoc construction mechanism to summarize paths that appear frequently in a query workload. 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.