By Hamideh Afsarmanesh, Luis M. Camarinha-Matos (auth.), Sourav S. Bhowmick, Josef Küng, Roland Wagner (eds.)
This e-book constitutes the refereed complaints of the twentieth foreign convention on Database and specialist structures purposes, DEXA 2009, held in Linz, Austria, in August/September 2009.
The 35 revised complete papers and 35 brief papers awarded 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 data process structure, functionality and defense; question processing and optimisation; information and data integration and caliber; information and data streams; information mining algorithms; information and knowledge modelling; details retrieval and database structures; and database and knowledge approach structure and performance.
Read or Download Database and Expert Systems Applications: 20th International Conference, DEXA 2009, Linz, Austria, August 31 – September 4, 2009. Proceedings PDF
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Extra resources for Database and Expert Systems Applications: 20th International Conference, DEXA 2009, Linz, Austria, August 31 – September 4, 2009. Proceedings
Execution time ratio of C-DOVLEI to C-ORDPATH (horizontal axis: depth of node) Fig. 13. Execution time ratio of C-DOVLEI to C-ORDPATH (horizontal axis: XML document) all delimiters one by one. Figure 13 shows the execution time ratio using the document tables. From these results, we deduce that the execution times for extracting depth information and parent labels using the C-DO-VLEI code are about 25% and 15% less than execution times using C-ORDPATH, respectively, which indicates that the proposed method can achieve high performance in such applications as XPath query and keyword search.
Lm we deﬁne – – – – – – P to be a legal path, if l1 = ρ and li ∈ E for all i ∈ [1, n−1]1. ¯ denoted by P ⊆ P, ¯ if n ≤ m and li = ¯li for all i ∈ [1, n]. P to be a preﬁx of P, ¯ ¯ if P ⊆ P¯ and n < m. P to be a strict preﬁx of P, denoted by P ⊂ P, length(P ) = n to denote the length of P . P, ¯ to be l1 . ¯l1 . ¯lm . the concatenation of P and P, ¯ ¯ to be the intersection of P and P if both are legal paths, denoted by P ∩ P, ¯ the longest path that is a preﬁx of both P and P . For example, referring to Fig.
Iii) The restrictions on ﬁelds means that we only consider inclusion between text/attribute nodes, whereas the keyref mechanism also allows for inclusion between element nodes. We should mention that the restrictions discussed in (i) - (iii) are not intrinsic to our approach, and our deﬁnition of an XIND can easily be extended to handle these extension. Our reason for not considering these extensions here is so that we can concentrate on the main contribution of our paper, which is to apply diﬀerent semantics to an XIND so as to extend relational semantics.